A method and system for detecting cadmium activity in farmland soil

Abstract

The present invention discloses a method and system for detecting cadmium activity in farmland soil, and relates to the technical field of soil cadmium activity detection. The method for detecting cadmium activity in farmland soil comprises the following steps: obtaining an environmental impact index; activity analysis; obtaining an activity level evaluation value. The present invention obtains soil environmental data of a preset collection area, analyzes the degree of environmental impact according to the soil environmental data to obtain an environmental impact index, and then compares the obtained environmental impact index with a reference environmental impact index to determine whether to perform activity analysis. If not, environmental parameters are adjusted based on the comparison result. Finally, after performing activity analysis, an activity level evaluation value is obtained according to the result of activity analysis and an activity level evaluation report is generated, thereby achieving the effect of improving the accuracy of farmland soil cadmium activity detection, and solving the problem of low correlation between the accuracy of farmland soil cadmium activity detection and environmental impact in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of soil cadmium activity detection, and in particular to a method and system for detecting cadmium activity in farmland soil. Background Art

[0002] With the rapid development of industrialization, urbanization and agricultural intensification, the problem of heavy metal pollution in farmland soil has become increasingly prominent. Among them, active cadmium (Cd), as a common heavy metal pollutant, has high bioavailability and mobility. It is most easily absorbed by plant roots and enters the food chain, thus posing a threat to the quality of agricultural products and human health. The traditional method for detecting heavy metal cadmium in soil mainly determines the total amount of cadmium in the soil, that is, after the soil sample is digested, the total cadmium content is determined by atomic absorption spectrometry, inductively coupled plasma mass spectrometry and other methods. However, the results of this method can only reflect the total amount of cadmium in the soil, but cannot accurately reflect the content of active cadmium that can be absorbed and utilized by plants. Therefore, in order to more accurately assess the risk of cadmium pollution in farmland soil, a method that can detect the content of active cadmium in soil is needed.

[0003] In the prior art, soil samples from farmland areas are obtained and the absorbed light intensity of the soil samples is measured in real time under certain conditions to obtain the cadmium ion concentration. At the same time, the soil samples are detected and analyzed by a mass spectrometer to extract the effective cadmium, thereby achieving accurate detection of cadmium activity in farmland soil.

[0004] For example, the invention patent with announcement number: CN115165443B announces a soil multi-sample collection device and method for detecting cadmium in soil, including: making the bracket contact with the ground, turning on the motor to make the drill bit start to rotate and pressing the support rod downward to make the outer cylinder descend until the target depth is reached; pressing the spline shaft to make the drill bit and the spline shaft descend, and the inner cylinder also descends with the spline shaft to align the inner sampling port with the outer sampling port, and then rotating the rotating rod to make the paddle poke the soil into the sampling area; pressing the spline shaft to make the inner cylinder descend, rotating the inner cylinder along the horizontal slide groove through the card hole, and then pulling up the spline shaft to make it rise to its original position, and repeating the above steps to start the next sampling.

[0005] For example, the invention patent with announcement number: CN115586061B announces a soil sample pretreatment device and method for soil cadmium detection, which includes: filtering larger impurities through a vibrating screen in a primary screening box while vibrating large pieces of soil samples; performing primary grinding and removing plant residues and leaves in the soil sample through an electric suction screening component; adding an improver to the soil sample through a reagent dripping component to make cadmium exist in a single form, and grinding and stirring the soil sample back and forth by rotating the grinding and screening component back and forth; performing microwave-assisted digestion on the soil sample through a microwave digestion chamber, and at the same time, flattening the soil sample through a paddle to achieve a digestion effect on the soil sample.

[0006] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the existing technology, due to the real-time changes in the environment in which the farmland soil is located, the properties of the farmland soil change dynamically, resulting in the detection results being unable to truly reflect the cadmium activity of the entire farmland soil, which in turn leads to misjudgment of cadmium activity. There is a problem of low correlation between the accuracy of farmland soil cadmium activity detection and environmental impact. Summary of the invention

[0008] The embodiments of the present application provide a method and system for detecting cadmium activity in farmland soil, thereby solving the problem of low correlation between the accuracy of cadmium activity detection in farmland soil and environmental impact in the prior art, and achieving improved accuracy in detecting cadmium activity in farmland soil.

[0009] An embodiment of the present application provides a method for detecting cadmium activity in farmland soil, comprising the following steps: S1, acquiring soil environmental data of a preset collection area, analyzing the degree of environmental impact based on the soil environmental data to obtain an environmental impact index, wherein the environmental impact index is used to reflect the degree of impact of the soil environment on farmland soil samples in a preset collection area within a preset time period; S2, comparing the acquired environmental impact index with a reference environmental impact index to determine whether to perform activity analysis, and if not, adjusting environmental parameters based on the comparison result, wherein the activity analysis is used to reflect the activity state of cadmium in farmland soil within a preset time period, wherein the environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment; S3, after performing the activity analysis, acquiring an activity level evaluation value based on the result of the activity analysis and generating an activity level evaluation report, wherein the activity level evaluation value is used to reflect the activity level of cadmium in farmland soil in a preset collection area within a preset time period.

[0010] Furthermore, the soil environmental data includes internal environmental data and external environmental data; the internal environmental data includes soil pH value and soil organic matter content; the external environmental data includes soil temperature and soil moisture.

[0011] Furthermore, the specific steps of analyzing the degree of environmental impact according to soil environmental data to obtain an environmental impact index are: obtaining a pH impact index by comparing the obtained soil pH value with the soil reference pH value, obtaining an organic content impact index by comparing the obtained soil organic matter content with the soil reference organic matter content, the pH impact index being the ratio of the difference between the soil pH value and the soil reference pH value to the soil reference pH value, and the organic content impact index being the ratio of the difference between the soil organic matter content and the soil reference organic matter content to the soil reference organic matter content; multiplying the pH impact index with a preset pH impact index weight factor to obtain the impact of the pH value on the farmland soil sample, multiplying the organic content impact index with a preset organic content impact index weight factor to obtain the impact of the organic content on the farmland soil sample; summing the impact of the pH value on the farmland soil sample and the impact of the organic content on the farmland soil sample to obtain an internal environmental impact index; analyzing the degree of external environmental impact according to the external environmental data to obtain an external environmental impact index, and combining the obtained internal environmental impact index to obtain an environmental impact index.

[0012] Furthermore, the specific steps of analyzing the degree of influence of the external environment according to the external environment data to obtain the external environment influence index are: obtaining the temperature influence index by obtaining the soil temperature and the soil reference temperature, and obtaining the humidity influence index by simultaneously obtaining the soil moisture and the soil reference moisture, wherein the temperature influence index is the ratio of the difference between the soil temperature and the soil reference temperature to the soil reference temperature, and the humidity influence index is the ratio of the difference between the soil moisture and the soil reference moisture to the soil reference moisture; multiplying the temperature influence index by a preset temperature influence index weight factor to obtain the influence of the soil temperature on the farmland soil sample, and multiplying the humidity influence index by a preset humidity influence index weight factor to obtain the influence of the humidity on the farmland soil sample; and summing the influence of the soil temperature on the farmland soil sample and the influence of the soil moisture on the farmland soil sample to obtain the external environment influence index.

[0013] Furthermore, the specific execution steps of the activity analysis are: obtaining exchangeable cadmium data in farmland soil cadmium, performing ratio operation on the exchangeable cadmium data and the farmland soil cadmium data to obtain the proportion of exchangeable cadmium data, and the proportion of exchangeable cadmium data is used to reflect the activity of exchangeable cadmium data in farmland soil cadmium within a preset time period; judging whether the proportion of exchangeable cadmium data is within a preset proportion range, if so, recording the corresponding exchangeable cadmium data as an activity detection sample, otherwise reselecting the preset collection area and re-obtaining the exchangeable cadmium data in farmland soil cadmium until the proportion of exchangeable cadmium data is within the preset proportion range.

[0014] Furthermore, the step of obtaining the activity level evaluation value includes: judging whether the proportion of exchangeable cadmium data is within a preset proportion range, if the proportion of exchangeable cadmium data is within the preset proportion range, obtaining the activity level evaluation value, otherwise indicating that the activity level evaluation value is 0; the step of obtaining the activity level evaluation value is: measuring the initial concentration and the final concentration of cations in the farmland soil sample in real time by atomic absorption spectroscopy, obtaining the cation exchange rate, and the cation exchange rate is the ratio of the final concentration of cations to the initial concentration of cations; obtaining the alkaline farmland soil pH corresponding to the activity test sample under alkaline conditions and combining it with the alkaline farmland reference soil pH to obtain the alkaline soil impact index, and at the same time combining the carbonate content, the reference carbonate content and the obtained cation exchange rate to obtain the activity level evaluation value, and the alkaline soil impact index is the ratio of the absolute value of the difference between the alkaline farmland soil pH and the alkaline farmland reference soil pH to the alkaline farmland reference soil pH.

[0015] Furthermore, the activity level assessment report is used to visualize the activity level corresponding to the activity detection sample within a preset time period; the activity level includes high activity, medium activity and low activity; the high activity represents the activity detection sample corresponding to when the activity level assessment value within the preset time period is greater than the reference activity level assessment value; the medium activity represents the activity detection sample corresponding to when the activity level assessment value within the preset time period is equal to the reference activity level assessment value; the low activity represents the activity detection sample corresponding to when the activity level assessment value within the preset time period is less than the reference activity level assessment value.

[0016] The embodiment of the present application provides a farmland soil cadmium activity detection system, including: an environmental impact index acquisition module, an activity analysis module and an activity level evaluation value acquisition module; wherein the environmental impact index acquisition module is used to acquire soil environmental data of a preset collection area, analyze the degree of environmental impact according to the soil environmental data to acquire an environmental impact index, and the environmental impact index is used to reflect the degree of influence of the soil environment on farmland soil samples in a preset collection area within a preset time period; the activity analysis module is used to compare the acquired environmental impact index with the reference environmental impact index to determine whether to perform activity analysis, and if not, to adjust environmental parameters based on the comparison result, and the activity analysis is used to reflect the activity state of farmland soil cadmium within a preset time period, and the environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment; the activity level evaluation value acquisition module is used to acquire an activity level evaluation value according to the result of the activity analysis after performing the activity analysis and generate an activity level evaluation report, and the activity level evaluation value is used to reflect the activity level of farmland soil cadmium in the preset collection area within the preset time period.

[0017] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0018] 1. The environmental impact degree is analyzed by the acquired soil environmental data to obtain an environmental impact index, and then the acquired environmental impact index is compared with the reference environmental impact index to determine whether to perform activity analysis. Finally, after performing the activity analysis, the activity level evaluation value is obtained according to the result of the activity analysis and an activity level evaluation report is generated, thereby achieving more accurate acquisition of the activity level evaluation value, thereby achieving improved accuracy in detecting cadmium activity in farmland soil, and effectively solving the problem of low correlation between the accuracy of detecting cadmium activity in farmland soil and environmental impact in the prior art.

[0019] 2. By judging whether the obtained environmental impact index is greater than the reference environmental impact index, if the obtained environmental impact index is greater than the reference environmental impact index, activity analysis is performed, otherwise the environmental parameters are adjusted, and the environmental impact index is re-obtained according to the result of the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index, then activity analysis is performed, thereby achieving a more accurate judgment of the activity analysis execution steps, and further achieving improved accuracy and reliability in obtaining the environmental impact index.

[0020] 3. By obtaining the exchangeable cadmium data in the farmland soil cadmium, and then performing a ratio operation on the exchangeable cadmium data and the farmland soil cadmium data to obtain the proportion of the exchangeable cadmium data, finally judging whether the proportion of the exchangeable cadmium data is within the preset proportion range, if so, the corresponding exchangeable cadmium data is recorded as an activity detection sample, otherwise, reselecting the preset collection area and re-obtaining the exchangeable cadmium data in the farmland soil cadmium until the proportion of the exchangeable cadmium data is within the preset proportion range, thereby achieving more accurate acquisition of the proportion of the exchangeable cadmium data, and then achieving improved accuracy of activity analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of a method for detecting cadmium activity in farmland soil provided in an embodiment of the present application;

[0022] Figure 2 A two-dimensional coordinate analysis diagram of the internal environment impact index provided in the embodiment of the present application;

[0023] Figure 3 A two-dimensional coordinate analysis diagram of the external environment impact index provided in the embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of a farmland soil cadmium activity detection system provided in an embodiment of the present application;

[0025] Figure 5 A specific flow chart for detecting cadmium activity in farmland soil provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiment of the present application solves the problem of low correlation between the accuracy of cadmium activity detection in farmland soil and environmental impact in the prior art by providing a method and system for detecting cadmium activity in farmland soil. The method obtains soil environmental data of a preset collection area, analyzes the degree of environmental impact according to the soil environmental data to obtain an environmental impact index, and determines whether the obtained environmental impact index is greater than a reference environmental impact index. If the obtained environmental impact index is greater than the reference environmental impact index, activity analysis is performed. Otherwise, it indicates that the activity of cadmium in the farmland soil sample is low and environmental parameters are adjusted. Then, the environmental impact index is re-acquired according to the result of the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index. Activity analysis is performed. Finally, after performing the activity analysis, an activity level evaluation value is obtained according to the result of the activity analysis and an activity level evaluation report is generated, thereby improving the accuracy of cadmium activity detection in farmland soil.

[0027] The technical solution in the embodiment of the present application is to solve the problem of low correlation between the accuracy of cadmium activity detection in farmland soil and environmental impact. The overall idea is as follows:

[0028] The environmental impact degree is analyzed by acquiring soil environmental data to obtain an environmental impact index, and then the acquired environmental impact index is compared with the reference environmental impact index to determine whether to perform activity analysis. Finally, after performing the activity analysis, the activity level assessment value is obtained according to the results of the activity analysis and an activity level assessment report is generated, thereby achieving the effect of improving the accuracy of cadmium activity detection in farmland soil.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 As shown, it is a flow chart of a method for detecting cadmium activity in farmland soil provided by an embodiment of the present application, and the method comprises the following steps: S1, obtaining soil environmental data of a preset collection area, analyzing the degree of environmental impact according to the soil environmental data to obtain an environmental impact index, and the environmental impact index is used to reflect the degree of impact of the soil environment on farmland soil samples in a preset collection area within a preset time period;

[0031] S2, compare the obtained environmental impact index with the reference environmental impact index to determine whether to perform activity analysis. If not, adjust the environmental parameters based on the comparison results. The activity analysis is used to reflect the activity state of cadmium in farmland soil within a preset time period. The cadmium in farmland soil is the cadmium in farmland soil samples. The environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment. S3, after performing the activity analysis, obtain the activity level evaluation value according to the result of the activity analysis and generate an activity level evaluation report. The activity level evaluation value is used to reflect the activity level of cadmium in farmland soil in the preset collection area within the preset time period.

[0032] Compared with the prior art, this embodiment can more scientifically quantify the influence of soil environment on the activity of cadmium in farmland soil by considering the influence of soil environmental data on farmland soil samples and obtaining the environmental impact index, thereby improving the accuracy of cadmium activity detection in farmland soil; at the same time, an activity level assessment report is generated based on the results of activity analysis, which can intuitively reflect the activity level of cadmium in farmland soil and provide a strong basis for farmland management and decision-making; secondly, through the determination of the environmental impact index, unnecessary activity analysis is avoided, thereby saving manpower, material resources and time costs, and targeted soil remediation plans can be formulated to reduce the harm of soil cadmium pollution to crops and the ecological environment, so as to promote a virtuous cycle of the agricultural ecological environment.

[0033] Among them, soil environmental data include internal environmental data and external environmental data; internal environmental data include soil pH value and soil organic matter content of farmland soil samples; external environmental data include soil temperature and soil moisture of farmland soil samples.

[0034] In this embodiment, under different pH conditions, the existence form and activity of cadmium in the soil will change. For example, under alkaline conditions, cadmium in the soil is less likely to dissolve and be absorbed by plants. As the soil pH value increases, its biological effectiveness decreases; as the organic matter content increases, the water and fertilizer retention capacity of farmland soil samples also increases, thereby increasing the activity of cadmium; changes in soil temperature will affect the solubility and mobility of soil cadmium. For example, at higher temperatures (such as above 40°C), soil microbial activity is enhanced, which will promote the release and transformation of cadmium; soil moisture directly affects the ion concentration and diffusion rate of the soil solution, thereby affecting the solubility and mobility of soil cadmium.

[0035] It should be noted that the soil pH value in this embodiment is usually greater than or equal to 7 (i.e., neutral or alkaline soil), the soil reference pH value is represented by the minimum value of the historical soil pH value in the historical time period in the preset database, the soil pH value is measured by directly inserting the soil pH tester into the farmland soil sample (the depth of the soil pH tester directly inserted during each measurement is the same), the soil reference organic matter content is represented by the minimum value of the historical organic matter content in the historical time period in the preset database, and the soil organic carbon content and carbon dioxide content in the farmland soil sample are measured in real time by the total organic carbon analyzer to obtain the soil organic matter content (the difference between the soil organic carbon content and the carbon dioxide content). It should be noted that the soil organic matter content in this embodiment is the soil organic carbon element content. The soil temperature and soil moisture are measured in real time by the temperature sensor and humidity sensor in the farmland soil sample. It should be noted that the positions of the temperature sensor and humidity sensor in each farmland soil sample are the same; the soil reference temperature is represented by the minimum value of the historical soil temperature in the historical time period in the preset database, and the soil reference humidity is represented by the minimum value of the historical soil humidity in the historical time period in the preset database.

[0036] In summary, by comprehensively considering the internal environment (soil pH value, soil organic matter content) and external environment (soil temperature, soil moisture) factors of soil environmental data, we can have a more comprehensive understanding of the activity state of soil cadmium and its influencing factors, provide a scientific basis for formulating soil management and remediation measures, and improve the accuracy of cadmium activity detection in farmland soil.

[0037] Furthermore, the specific steps of analyzing the degree of environmental impact according to soil environmental data to obtain the environmental impact index are as follows: obtaining the pH impact index by comparing the obtained soil pH value with the soil reference pH value, obtaining the organic content impact index by comparing the obtained soil organic matter content with the soil reference organic matter content, the pH impact index is the ratio of the difference between the soil pH value and the soil reference pH value to the soil reference pH value, and the organic content impact index is the ratio of the difference between the soil organic matter content and the soil reference organic matter content to the soil reference organic matter content; multiplying the pH impact index with a preset pH impact index weight factor to obtain the impact of the pH value on the farmland soil sample, and multiplying the organic content impact index with a preset organic content impact index weight factor to obtain the impact of the organic content on the farmland soil sample; summing the impact of the pH value on the farmland soil sample and the impact of the organic content on the farmland soil sample to obtain the internal environmental impact index; analyzing the degree of external environmental impact according to the external environmental data to obtain the external environmental impact index, and combining the obtained internal environmental impact index to obtain the environmental impact index.

[0038] In this embodiment, the organic content impact index weight factor is the weight factor corresponding to the organic content impact index in the preset database during the internal environment impact index acquisition process, which represents the numerical value of the degree of influence of the organic content impact index on the internal environment impact index. When used, the organic content impact index weight factor corresponding to the organic content impact index can be directly obtained from the preset database, and the corresponding relationship can be a pre-set mapping relationship. For example, the organic content impact index corresponding to the internal environment impact index acquisition process and the weight factor corresponding to the organic content impact index in the preset database form a mapping set, and the real-time organic content impact index is input into the mapping set to obtain the corresponding organic content impact index weight factor, wherein the mapping relationship can be a one-to-one correspondence or a many-to-one relationship. The value range of the organic content impact index weight factor in this example is .

[0039] The pH impact index weight factor is the weight factor corresponding to the pH impact index in the preset database during the internal environment impact index acquisition process, which represents the numerical value of the degree of influence of the pH impact index on the internal environment impact index. When used, the pH impact index weight factor corresponding to the pH impact index can be directly obtained from the preset database. The corresponding relationship can be a pre-set mapping relationship. For example, the pH impact index corresponding to the internal environment impact index acquisition process and the weight factor corresponding to the pH impact index in the preset database form a mapping set, and the real-time pH impact index is input into the mapping set to obtain the corresponding pH impact index weight factor. The mapping relationship can be one-to-one or many-to-one. The value range of the pH impact index weight factor in this example is It should be noted that the sum of the pH impact index weight factor and the organic matter content impact index weight factor in this embodiment is 1.

[0040] Among them, the specific steps of analyzing the degree of influence of the external environment on the external environment according to the external environment data to obtain the external environment influence index are as follows: obtaining the temperature influence index by obtaining the soil temperature and the soil reference temperature, and obtaining the humidity influence index by obtaining the soil moisture and the soil reference moisture at the same time, the temperature influence index is the ratio of the difference between the soil temperature and the soil reference temperature to the soil reference temperature, and the humidity influence index is the ratio of the difference between the soil moisture and the soil reference moisture to the soil reference moisture; multiplying the temperature influence index with the preset temperature influence index weight factor to obtain the influence of the soil temperature on the farmland soil samples, and multiplying the humidity influence index with the preset humidity influence index weight factor to obtain the influence of the humidity on the farmland soil samples; summing the influence of the soil temperature on the farmland soil samples and the influence of the soil moisture on the farmland soil samples to obtain the external environment influence index.

[0041] Specifically, the environmental impact index is calculated using the following formula:

[0042] ;

[0043] ;

[0044] ;

[0045] In the formula, y is the number of the preset collection area, , Y is the total number of preset collection areas, b is the number of farmland soil samples in the preset collection area, , B is the total number of farmland soil samples in the preset collection area, t is the number of the preset time period, , T is the total number of preset time periods, represents the environmental impact index of the b-th farmland soil sample in the y-th preset collection area, It represents the internal environmental impact index of the bth farmland soil sample in the yth preset collection area within the tth preset time period, It represents the external environmental impact index of the bth farmland soil sample in the yth preset collection area within the tth preset time period, represents the weight factor of soil temperature impact index, represents the soil temperature of the bth farmland soil sample in the yth preset collection area during the tth preset time period, represents the reference soil temperature, represents the weight factor of soil moisture impact index, represents the soil moisture of the bth farmland soil sample in the yth preset collection area during the tth preset time period, represents the reference soil moisture, represents the pH influence index weight factor, It represents the soil pH value of the b-th farmland soil sample in the y-th preset collection area in the t-th preset time period, Indicates the soil reference pH value, Represents the weight factor of the organic matter content impact index, It represents the soil organic matter content of the bth farmland soil sample in the yth preset collection area in the tth preset time period, Indicates the reference organic matter content of soil.

[0046] It should be understood that the reference data involved here are the minimum values ​​of the corresponding data in the historical time period. , , , ,like Figure 2As shown, it is a two-dimensional coordinate analysis diagram of the internal environment impact index provided in the embodiment of the present application (in this case, the external environment impact index is a fixed value of 0.3), as shown Figure 3 As shown, it is a two-dimensional coordinate analysis diagram of the external environmental impact index provided in the embodiment of the present application (at this time, the internal environmental impact index is a fixed value of 0.8). The environmental impact index increases with the increase of the internal environmental impact index. Specifically, the environmental impact index increases with the increase of soil pH value, soil organic matter content, soil temperature and soil moisture.

[0047] It should be noted that the external environmental impact index also indirectly affects the value of the internal environmental impact index. When the rainfall in the preset collection area increases, the soil moisture increases, thereby neutralizing the alkalinity of the soil pH, thereby reducing the internal environmental impact index (because the lower the soil alkalinity, in practical applications, when selecting farmland soil samples, it is usually avoided to select soil from the corresponding area after rain), thereby improving the accuracy of farmland soil cadmium activity detection, and then achieving an improvement in the accuracy of farmland soil cadmium activity detection, effectively solving the problem of low correlation between the accuracy of farmland soil cadmium activity detection and environmental impact in the prior art.

[0048] Among them, the temperature impact index weight factor is the weight factor corresponding to the temperature impact index in the preset database during the acquisition of the external environment impact index, which represents the numerical value of the degree of influence of the temperature impact index on the external environment impact index. When used, the temperature impact index weight factor corresponding to the temperature impact index can be directly obtained from the preset database. The corresponding relationship can be a pre-set mapping relationship. For example, the temperature impact index corresponding to the acquisition of the external environment impact index and the weight factor corresponding to the temperature impact index in the preset database form a mapping set, and the real-time temperature impact index is input into the mapping set to obtain the corresponding temperature impact index weight factor. The mapping relationship can be one-to-one or many-to-one. The value range of the temperature impact index weight factor in this example is .

[0049] The humidity impact index weight factor is the weight factor corresponding to the humidity impact index in the preset database during the external environment impact index acquisition process, which represents the numerical value of the humidity impact index's influence on the external environment impact index. When used, the humidity impact index weight factor corresponding to the humidity impact index can be directly obtained from the preset database. The corresponding relationship can be a pre-set mapping relationship. For example, the humidity impact index corresponding to the external environment impact index acquisition process and the weight factor corresponding to the humidity impact index in the preset database form a mapping set, and the real-time humidity impact index is input into the mapping set to obtain the corresponding humidity impact index weight factor. The mapping relationship can be one-to-one or many-to-one. The value range of the humidity impact index weight factor in this example is In this embodiment, the sum of the temperature impact index weight factor and the humidity impact index weight factor is 1.

[0050] Furthermore, the specific process of comparing the obtained environmental impact index with the reference environmental impact index to determine whether to perform activity analysis is as follows: determine whether the obtained environmental impact index is greater than the reference environmental impact index, if so, perform activity analysis, otherwise adjust the environmental parameters; after adjusting the environmental parameters, re-acquire the environmental impact index according to the result of the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index, and then perform activity analysis.

[0051] In this embodiment, the reference environmental impact index is represented by the sum and average of the historical environmental impact indices in the historical time period in the preset database. The obtained environmental impact index is less than the reference environmental impact index. At this time, the influence of environmental factors on the cadmium activity of farmland soil is reduced (that is, the proportion of insoluble cadmium in the soil increases, which is not conducive to the detection of cadmium activity). This method also helps to timely discover and solve farmland soil pollution problems, prevent the spread and aggravation of pollution, and provide an effective technical means for farmland soil pollution assessment and control.

[0052] Furthermore, the specific process of environmental parameter adjustment is as follows: E1, obtaining the environmental impact index deviation, and obtaining the corresponding irrigation parameter adjustment amount and fertilization parameter adjustment amount according to the obtained environmental impact index deviation, the environmental impact index deviation is the difference between the reference environmental impact index and the obtained environmental impact index, the irrigation parameter adjustment amount is the increase or decrease in irrigation water volume and irrigation frequency, and the fertilization parameter adjustment amount is the increase or decrease in fertilization amount; E2, prompting the preset personnel to re-acquire soil environmental data and environmental impact index after making deviation adjustments according to the irrigation parameter adjustment amount and the fertilization parameter adjustment amount, and the deviation adjustment means making corresponding adjustments to the irrigation and fertilization operations of the farmland soil area corresponding to the farmland soil sample; E3, when the re-acquired environmental impact index is greater than the reference environmental impact index, the re-acquired environmental impact index is stored in the preset database, otherwise E4 is executed; E4, re-selecting the preset sampling area and obtaining the environmental impact index, and stopping the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index.

[0053] In this embodiment, when the obtained environmental impact index is greater than the reference environmental impact index, there is no need to adjust the environmental parameters, and activity analysis can be performed at this time; the environmental impact index deviation reflects the gap between the current cadmium activity in the farmland soil and the expected cadmium activity; when the environmental impact index deviation increases, this means that the cadmium in the farmland soil is more easily absorbed by crops, and it is necessary to increase the amount of irrigation water (which helps dilute the cadmium concentration in the farmland soil, thereby reducing the harm to crops when the cadmium concentration increases) and the irrigation frequency (which helps to flow the cadmium ions in the surface layer of the farmland soil into the deep layer of the farmland soil to reduce its accumulation in the root distribution layer of the crops, thereby reducing the absorption of cadmium by the crops). Otherwise, reduce the amount of irrigation water and the irrigation frequency, or reduce the amount of fertilizer applied, to ensure more accurate detection of cadmium activity in the farmland soil.

[0054] Furthermore, the specific execution steps of the activity analysis are: obtaining exchangeable cadmium data in farmland soil cadmium, performing ratio operation on the exchangeable cadmium data and the farmland soil cadmium data to obtain the proportion of exchangeable cadmium data, the exchangeable cadmium data represents the cadmium ions in the farmland soil sample that exist in the farmland soil sample due to exchange with the cations adsorbed on the soil surface, and the proportion of exchangeable cadmium data is used to reflect the activity of exchangeable cadmium data in farmland soil cadmium within a preset time period; judging whether the proportion of exchangeable cadmium data is within a preset proportion range, if so, recording the corresponding exchangeable cadmium data as an activity detection sample, otherwise reselecting the preset collection area and re-obtaining the exchangeable cadmium data in farmland soil cadmium until the proportion of exchangeable cadmium data is within the preset proportion range, the exchangeable cadmium data within the preset proportion range has high activity, and the activity detection sample is used to detect the activity of farmland soil cadmium within a preset time period.

[0055] In this embodiment, the cadmium in farmland soil is atomized by the high temperature of a graphite furnace through graphite furnace atomic absorption spectrometry (which has the advantages of high sensitivity and high accuracy), and its absorbance is measured by an atomic absorption spectrometer to obtain exchangeable cadmium data; the preset proportion range is the range corresponding to the difference between the maximum allowable proportion and the reference proportion, wherein the maximum allowable proportion is represented by the sum and average of the maximum values ​​of the historical exchangeable cadmium data proportions within the historical time period in the preset database, and the reference proportion is represented by the sum and average of the historical exchangeable cadmium data proportions in the preset database; by accurately obtaining the exchangeable cadmium data proportion and accurately selecting the activity detection samples, the accuracy and reliability of cadmium activity detection in farmland soil are improved.

[0056] Furthermore, the step of obtaining the activity level evaluation value includes: judging whether the exchangeable cadmium data ratio is within a preset ratio range, if the exchangeable cadmium data ratio is within the preset ratio range, obtaining the activity level evaluation value, otherwise indicating that the activity level evaluation value is 0; the step of obtaining the activity level evaluation value includes: measuring the initial concentration and the final concentration of cations in the farmland soil sample in real time by atomic absorption spectroscopy to obtain the cation exchange rate, the initial concentration of cations being the concentration of cations adsorbed on the soil surface in the farmland soil sample at the beginning of the activity analysis, and the final concentration of cations being the concentration of cations adsorbed on the soil surface in the farmland soil sample after the activity analysis is completed within a preset time period. The concentration of cations adsorbed on the soil surface is obtained in this method, and the cation exchange rate is the ratio of the final cation concentration to the initial cation concentration. The alkaline farmland soil pH corresponding to the activity test sample under alkaline conditions is obtained and combined with the alkaline farmland reference soil pH to obtain the alkaline soil impact index. At the same time, the activity level evaluation value is obtained by combining the carbonate content, the reference carbonate content and the obtained cation exchange rate. The alkaline soil impact index is the ratio of the absolute value of the difference between the alkaline farmland soil pH and the alkaline farmland reference soil pH to the alkaline farmland reference soil pH. The carbonate content is the carbonate content in the farmland soil corresponding to the activity test sample.

[0057] In this embodiment, the reference carbonate content is represented by the sum and average of the historical maximum carbonate contents in the historical activity detection samples in the preset database, and the alkaline farmland reference soil pH is represented by the sum and average of the historical alkaline farmland soil pH in the historical activity detection samples in the preset database.

[0058] Specifically, the activity level evaluation value is calculated by the following formula:

[0059] ;

[0060] ;

[0061] ;

[0062] In the formula, b is the number of the farmland soil sample in the preset collection area, , B is the total number of farmland soil samples in the preset collection area, r is the number of the activity test sample, , R is the total number of active detection samples, t is the number of the preset time period, , T is the total number of preset time periods, e is a natural constant, It represents the activity level evaluation value of the rth activity detection sample in the bth farmland soil sample in the preset collection area within the preset time period. It represents the alkaline soil impact index of the farmland soil corresponding to the rth active detection sample in the bth farmland soil sample in the preset collection area in the tth preset time period, It represents the alkaline farmland soil pH of the farmland soil corresponding to the rth active detection sample in the bth farmland soil sample in the preset collection area during the tth preset time period, Indicates the alkaline farmland reference soil pH, It represents the cation exchange rate of the rth active test sample in the bth farmland soil sample in the preset collection area during the tth preset time period, It represents the final cation concentration of the rth active detection sample in the bth farmland soil sample in the preset collection area within the tth preset time period, It represents the initial cation concentration of the rth active detection sample in the bth farmland soil sample in the preset collection area within the tth preset time period, It indicates the carbonate content of the farmland soil corresponding to the rth active detection sample in the bth farmland soil sample in the preset collection area in the tth preset time period, represents the reference carbonate content, It represents the proportion of exchangeable cadmium data of the rth active detection sample in the bth farmland soil sample in the preset collection area within the tth preset time period, Indicates the preset ratio range.

[0063] It is important to understand that when The activity level evaluation value decreases with the increase of alkaline soil impact index and cation exchange rate. Specifically, the activity level evaluation value decreases with the increase of alkaline farmland soil pH and cation final concentration. It should be noted that the alkaline soil impact index also indirectly affects the value of the cation exchange rate, thereby achieving an improvement in the accuracy of farmland soil cadmium activity detection, and effectively solving the problem of low correlation between farmland soil cadmium activity detection accuracy and environmental impact in the prior art.

[0064] Furthermore, the activity level evaluation report is used to visualize the activity level corresponding to the activity detection sample within a preset time period; the activity levels include high activity, medium activity and low activity; high activity indicates the activity detection sample corresponding to when the activity level evaluation value within the preset time period is greater than the reference activity level evaluation value; medium activity indicates the activity detection sample corresponding to when the activity level evaluation value within the preset time period is equal to the reference activity level evaluation value; low activity indicates the activity detection sample corresponding to when the activity level evaluation value within the preset time period is less than the reference activity level evaluation value.

[0065] In this embodiment, an activity level assessment report is generated through visualization means (such as charts and maps) to display the activity level of the activity test samples within a preset time period, so that the assessment results are more intuitive and easy to understand so as to quickly understand the state of soil cadmium activity. More targeted remediation and management measures can be formulated for different levels of soil pollution. At the same time, the activity level assessment report is regularly updated to reflect the dynamic changes in soil pollution conditions, which helps to timely discover and solve potential environmental problems and ensure the sustainable use of soil resources.

[0066] like Figure 4 As shown, it is a structural schematic diagram of a farmland soil cadmium activity detection system provided by an embodiment of the present application. The farmland soil cadmium activity detection system provided by an embodiment of the present application includes: an environmental impact index acquisition module, an activity analysis module and an activity level evaluation value acquisition module; wherein the environmental impact index acquisition module is used to acquire soil environmental data of a preset collection area, analyze the degree of environmental impact according to the soil environmental data to obtain an environmental impact index, and the environmental impact index is used to reflect the degree of influence of the soil environment on the farmland soil samples of the preset collection area within a preset time period; the activity analysis module is used to compare the acquired environmental impact index with the reference environmental impact index to determine whether to perform activity analysis, if not, adjust the environmental parameters based on the comparison result, the activity analysis is used to reflect the activity state of farmland soil cadmium within a preset time period, the farmland soil cadmium is cadmium in the farmland soil sample, and the environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment; the activity level evaluation value acquisition module is used to acquire the activity level evaluation value according to the result of the activity analysis after performing the activity analysis and generate an activity level evaluation report, and the activity level evaluation value is used to reflect the activity level of farmland soil cadmium in the preset collection area within a preset time period.

[0067] In this embodiment, the cooperation among the environmental impact index acquisition module, the activity analysis module and the activity level evaluation value acquisition module is helpful to improve the more accurate detection of cadmium activity in farmland soil, such as Figure 5 As shown, it is a specific flow chart for the detection of cadmium activity in farmland soil provided in the embodiment of the present application, which realizes the comprehensive monitoring and evaluation of cadmium activity in farmland soil and provides strong support for ensuring the quality and safety of crops.

[0068] To summarize, the embodiment of the present application analyzes the degree of environmental impact through the acquired soil environmental data to obtain an environmental impact index, and then compares the acquired environmental impact index with the reference environmental impact index to determine whether to perform activity analysis, and finally obtains the activity level evaluation value according to the result of the activity analysis after performing the activity analysis and generates an activity level evaluation report, thereby achieving more accurate acquisition of the activity level evaluation value, and further achieving improved accuracy in detecting cadmium activity in farmland soil, effectively solving the problem of low correlation between the accuracy of detecting cadmium activity in farmland soil and environmental impact in the prior art.

[0069] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0070] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1The steps for the functions specified in one or more boxes.

[0073] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0074] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for detecting cadmium activity in farmland soil, characterized in that: The following steps are involved: S1, obtaining soil environmental data of a preset collection area, analyzing the environmental impact degree according to the soil environmental data to obtain an environmental impact index, wherein the environmental impact index is used to reflect the impact degree of the soil environment on the farmland soil samples of the preset collection area within a preset time period; S2, comparing the obtained environmental impact index with the reference environmental impact index to determine whether to perform activity analysis, and if not, adjusting environmental parameters based on the comparison result, wherein the activity analysis is used to reflect the activity state of cadmium in farmland soil within a preset time period, and the environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment; S3, after performing the activity analysis, obtaining an activity level evaluation value according to the result of the activity analysis and generating an activity level evaluation report, wherein the activity level evaluation value is used to reflect the activity level of cadmium in farmland soil in a preset collection area within a preset time period; The soil environment data includes internal environment data and external environment data; The internal environmental data include soil pH value and soil organic matter content; The external environment data includes soil temperature and soil moisture; The specific steps of analyzing the environmental impact degree according to soil environmental data to obtain the environmental impact index are: The pH influence index is obtained by comparing the obtained soil pH value with the soil reference pH value, and the organic content influence index is obtained by comparing the obtained soil organic matter content with the soil reference organic matter content, wherein the pH influence index is the ratio of the difference between the soil pH value and the soil reference pH value to the soil reference pH value, and the organic content influence index is the ratio of the difference between the soil organic matter content and the soil reference organic matter content to the soil reference organic matter content; The pH influence index is multiplied by a preset pH influence index weight factor to obtain the influence of the pH value on the farmland soil sample, and the organic matter content influence index is multiplied by a preset organic matter content influence index weight factor to obtain the influence of the organic matter content on the farmland soil sample; The internal environment impact index is obtained by summing the impact of pH value on farmland soil samples and the impact of organic matter content on farmland soil samples. The external environmental impact index is obtained by analyzing the external environmental impact degree according to the external environmental data, and the environmental impact index is obtained by combining the obtained internal environmental impact index; The specific steps of analyzing the external environment impact degree according to the external environment data to obtain the external environment impact index are: The temperature impact index is obtained by the obtained soil temperature and the soil reference temperature, and the humidity impact index is obtained by the obtained soil moisture and the soil reference moisture. The temperature impact index is the ratio of the difference between the soil temperature and the soil reference temperature to the soil reference temperature, and the humidity impact index is the ratio of the difference between the soil moisture and the soil reference moisture to the soil reference moisture. The temperature influence index is multiplied by the preset temperature influence index weight factor to obtain the influence of soil temperature on the farmland soil sample, and the humidity influence index is multiplied by the preset humidity influence index weight factor to obtain the influence of humidity on the farmland soil sample; The external environment impact index is obtained by summing the impact of soil temperature on farmland soil samples and the impact of soil moisture on farmland soil samples; The specific process of comparing the obtained environmental impact index with the reference environmental impact index to determine whether to perform activity analysis is as follows: Determine whether the obtained environmental impact index is greater than the reference environmental impact index. If the obtained environmental impact index is greater than the reference environmental impact index, perform activity analysis, otherwise adjust the environmental parameters; After adjusting the environmental parameters, re-obtaining the environmental impact index according to the result of the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index and then performing activity analysis; The specific execution steps of the activity analysis are: Acquire exchangeable cadmium data in farmland soil cadmium, perform ratio calculation on the exchangeable cadmium data and the farmland soil cadmium data to obtain the exchangeable cadmium data ratio, wherein the exchangeable cadmium data ratio is used to reflect the activity of the exchangeable cadmium data in the farmland soil cadmium within a preset time period; Determine whether the exchangeable cadmium data ratio is within the preset ratio range. If so, record the corresponding exchangeable cadmium data as an active detection sample. Otherwise, reselect the preset collection area and reacquire the exchangeable cadmium data in the farmland soil cadmium until the exchangeable cadmium data ratio is within the preset ratio range. The step of obtaining the activity level evaluation value comprises: Determine whether the exchangeable cadmium data ratio is within a preset ratio range. If the exchangeable cadmium data ratio is within the preset ratio range, obtain the activity level evaluation value; otherwise, the activity level evaluation value is 0; The steps for obtaining the activity level evaluation value are as follows: The initial concentration and the final concentration of cations in the farmland soil sample are measured in real time by atomic absorption spectroscopy to obtain a cation exchange rate, wherein the cation exchange rate is the ratio of the final concentration of cations to the initial concentration of cations; The alkaline farmland soil pH corresponding to the activity test sample under alkaline conditions is obtained and combined with the alkaline farmland reference soil pH to obtain the alkaline soil impact index. At the same time, the activity level evaluation value is obtained by combining the carbonate content, the reference carbonate content and the obtained cation exchange rate. The alkaline soil impact index is the ratio of the absolute value of the difference between the alkaline farmland soil pH and the alkaline farmland reference soil pH to the alkaline farmland reference soil pH.

2. A method for detecting cadmium activity in farmland soil as claimed in claim 1, characterized in that: The specific process of adjusting the environmental parameters is as follows: E1, obtaining an environmental impact index deviation, and obtaining corresponding irrigation parameter adjustment amounts and fertilization parameter adjustment amounts according to the obtained environmental impact index deviation, wherein the environmental impact index deviation is the difference between the reference environmental impact index and the obtained environmental impact index; E2, prompts the preset personnel to re-acquire soil environmental data and environmental impact index after making deviation adjustments based on the irrigation parameter adjustment amount and fertilization parameter adjustment amount; E3, when the re-acquired environmental impact index is greater than the reference environmental impact index, the re-acquired environmental impact index is stored in a preset database, otherwise, E4 is executed; E4, reselect the preset sampling area and obtain the environmental impact index, and stop adjusting the environmental parameters when the obtained environmental impact index is greater than the reference environmental impact index.

3. A method for detecting cadmium activity in farmland soil according to claim 1, characterized in that: The activity level assessment report is used to visualize the activity level of the activity detection sample corresponding to a preset time period; The activity levels include high activity, medium activity and low activity; The high activity refers to the activity detection sample corresponding to the activity level evaluation value greater than the reference activity level evaluation value within the preset time period; The medium activity refers to the activity detection sample corresponding to the activity level evaluation value equal to the reference activity level evaluation value within the preset time period; The low activity refers to an activity detection sample corresponding to a time when the activity level evaluation value is less than the reference activity level evaluation value within a preset time period.

4. A system for detecting cadmium activity in farmland soil, characterized in that: include: Environmental impact index acquisition module, activity analysis module and activity level assessment value acquisition module; The environmental impact index acquisition module is used to acquire soil environmental data of a preset collection area, and analyze the degree of environmental impact according to the soil environmental data to acquire an environmental impact index, wherein the environmental impact index is used to reflect the degree of influence of the soil environment on farmland soil samples in a preset collection area within a preset time period; The activity analysis module is used to compare the acquired environmental impact index with the reference environmental impact index to determine whether to perform activity analysis. If not, environmental parameter adjustment is performed based on the comparison result. The activity analysis is used to reflect the activity state of cadmium in farmland soil within a preset time period. The environmental parameter adjustment includes irrigation parameter adjustment, fertilization parameter adjustment and preset collection area adjustment. The activity level evaluation value acquisition module is used to acquire the activity level evaluation value according to the result of the activity analysis after performing the activity analysis and generate an activity level evaluation report, wherein the activity level evaluation value is used to reflect the activity level of cadmium in the farmland soil in the preset collection area within a preset time period; The soil environment data includes internal environment data and external environment data; The internal environmental data include soil pH value and soil organic matter content; The external environment data includes soil temperature and soil moisture; The specific steps of analyzing the environmental impact degree according to soil environmental data to obtain the environmental impact index are: The pH influence index is obtained by comparing the obtained soil pH value with the soil reference pH value, and the organic content influence index is obtained by comparing the obtained soil organic matter content with the soil reference organic matter content, wherein the pH influence index is the ratio of the difference between the soil pH value and the soil reference pH value to the soil reference pH value, and the organic content influence index is the ratio of the difference between the soil organic matter content and the soil reference organic matter content to the soil reference organic matter content; The pH influence index is multiplied by a preset pH influence index weight factor to obtain the influence of the pH value on the farmland soil sample, and the organic matter content influence index is multiplied by a preset organic matter content influence index weight factor to obtain the influence of the organic matter content on the farmland soil sample; The internal environment impact index is obtained by summing the impact of pH value on farmland soil samples and the impact of organic matter content on farmland soil samples. The external environmental impact index is obtained by analyzing the external environmental impact degree according to the external environmental data, and the environmental impact index is obtained by combining the obtained internal environmental impact index; The specific steps of analyzing the external environment impact degree according to the external environment data to obtain the external environment impact index are: The temperature impact index is obtained by the obtained soil temperature and the soil reference temperature, and the humidity impact index is obtained by the obtained soil moisture and the soil reference moisture. The temperature impact index is the ratio of the difference between the soil temperature and the soil reference temperature to the soil reference temperature, and the humidity impact index is the ratio of the difference between the soil moisture and the soil reference moisture to the soil reference moisture. The temperature influence index is multiplied by the preset temperature influence index weight factor to obtain the influence of soil temperature on the farmland soil sample, and the humidity influence index is multiplied by the preset humidity influence index weight factor to obtain the influence of humidity on the farmland soil sample; The external environment impact index is obtained by summing the impact of soil temperature on farmland soil samples and the impact of soil moisture on farmland soil samples; The specific process of comparing the obtained environmental impact index with the reference environmental impact index to determine whether to perform activity analysis is as follows: Determine whether the obtained environmental impact index is greater than the reference environmental impact index. If the obtained environmental impact index is greater than the reference environmental impact index, perform activity analysis, otherwise adjust the environmental parameters; After adjusting the environmental parameters, re-obtaining the environmental impact index according to the result of the environmental parameter adjustment until the obtained environmental impact index is greater than the reference environmental impact index and then performing activity analysis; The specific execution steps of the activity analysis are: Acquire exchangeable cadmium data in farmland soil cadmium, perform ratio calculation on the exchangeable cadmium data and the farmland soil cadmium data to obtain the exchangeable cadmium data ratio, wherein the exchangeable cadmium data ratio is used to reflect the activity of the exchangeable cadmium data in the farmland soil cadmium within a preset time period; Determine whether the exchangeable cadmium data ratio is within the preset ratio range. If so, record the corresponding exchangeable cadmium data as an active detection sample. Otherwise, reselect the preset collection area and reacquire the exchangeable cadmium data in the farmland soil cadmium until the exchangeable cadmium data ratio is within the preset ratio range. The step of obtaining the activity level evaluation value comprises: Determine whether the exchangeable cadmium data ratio is within a preset ratio range. If the exchangeable cadmium data ratio is within the preset ratio range, obtain the activity level evaluation value; otherwise, the activity level evaluation value is 0; The steps for obtaining the activity level evaluation value are as follows: The initial concentration and the final concentration of cations in the farmland soil sample are measured in real time by atomic absorption spectroscopy to obtain a cation exchange rate, wherein the cation exchange rate is the ratio of the final concentration of cations to the initial concentration of cations; The alkaline farmland soil pH corresponding to the activity test sample under alkaline conditions is obtained and combined with the alkaline farmland reference soil pH to obtain the alkaline soil impact index. At the same time, the activity level evaluation value is obtained by combining the carbonate content, the reference carbonate content and the obtained cation exchange rate. The alkaline soil impact index is the ratio of the absolute value of the difference between the alkaline farmland soil pH and the alkaline farmland reference soil pH to the alkaline farmland reference soil pH.

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