Soil drought resistance determination method and device, equipment and storage medium

Abstract

The invention provides a soil drought resistance determination method, device and equipment and a storage medium, and the method comprises the following steps: determining a specific drought-susceptibility index of a target soil sample in a specific water content state based on the volume, saturated water content, saturated hydraulic conductivity and a soil water holding curve of the target soil sample; the specific drought-susceptibility index represents the power required for transferring unit water from unit volume of a target soil sample to the surface of a crop root system in unit time; and determining the drought resistance of the target soil sample based on the specific drought-susceptibility index of the target soil sample. Therefore, the drought resistance of the soil is comprehensively, accurately and quantitatively evaluated, and a theoretical basis and practical guidance are provided for comparison and improvement of the drought resistance of the soil in agricultural production.

Description

Technical Field

[0001] The present invention relates to the field of agricultural drought resistance technology, and in particular to a method, device, equipment and storage medium for determining soil drought resistance. Background Art

[0002] Soil moisture limits the root water absorption rate and is the main cause of crop drought. This limitation is commonly referred to as soil drought resistance. Under the same meteorological drought conditions, the degree of drought stress of crops on different soils is different mainly because of the differences in drought resistance of different soils. Crops in soils with high drought resistance are not prone to drought stress, while crops in soils with low drought resistance are prone to drought stress.

[0003] Although there are many soil properties that affect soil drought resistance, no single soil property can fully reflect the soil's drought resistance. The combination of multiple soil properties is also difficult to quantitatively reflect the soil's drought resistance. Currently, there is a lack of objective indicators and methods for quantitatively evaluating soil drought resistance. Summary of the invention

[0004] The present invention provides a method, device, equipment and storage medium for determining soil drought resistance, which are used to solve the defect of the prior art that there is a lack of objective indicators and methods for quantitatively evaluating soil drought resistance, realize comprehensive and accurate quantitative evaluation of soil drought resistance, and provide theoretical basis and practical guidance for comparison and improvement of soil drought resistance in agricultural production.

[0005] The present invention provides a method for determining soil drought resistance, comprising the following steps: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, determining a specific drought susceptibility index of the target soil sample under a specific water content state; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The drought resistance of the target soil sample is determined based on the specific drought susceptibility index of the target soil sample.

[0006] According to a method for determining soil drought resistance provided by the present invention, the method for determining the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample comprises: Determining an overall drought susceptibility index of the target soil sample based on the specific drought susceptibility index, the field holding capacity of the target soil sample, and the wilting point of the target soil sample; Based on the overall drought susceptibility index of the target soil sample, the drought resistance of the target soil sample is determined.

[0007] A method for determining soil drought resistance provided by the present invention determines a specific drought susceptibility index of a target soil sample under a specific moisture content state based on the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, including: Fitting the soil water retention curve of the target soil sample based on the exponential function and the saturated water content of the target soil sample to obtain a soil water retention curve equation; Determining a soil hydraulic conductivity curve equation based on the saturated hydraulic conductivity and saturated water content of the target soil sample; Determining a change in soil moisture free energy based on the soil water retention curve equation and the volume of the target soil sample; Calculating water flux based on the soil water retention curve equation and the soil hydraulic conductivity curve equation; Based on the water flux, the water balance equation and the change in soil moisture free energy, a specific drought susceptibility index of the target soil sample under a specific moisture content state is calculated.

[0008] According to a method for determining soil drought resistance provided by the present invention, the soil water retention curve equation is expressed by the following formula: The soil hydraulic conductivity curve equation is expressed by the following formula: In the formula, The volumetric water content of soil is The soil matrix suction, The volumetric water content of soil is Soil hydraulic conductivity; represents the saturated water content of the target soil sample, represents the saturated hydraulic conductivity of the target soil sample; and is the fitting coefficient.

[0009] According to a method for determining soil drought resistance provided by the present invention, the change in soil moisture free energy is expressed by the following formula: In the formula, represents the change in soil moisture free energy, represents the volume of the target soil sample, is the density of water, is the acceleration due to gravity, The volumetric water content of soil is soil matrix suction.

[0010] According to a method for determining soil drought resistance provided by the present invention, based on the specific drought susceptibility index, the field holding capacity of the target soil sample and the wilting point of the target soil sample, the overall drought susceptibility index of the target soil sample is determined, comprising: The arithmetic mean of the specific drought susceptibility index values ​​is calculated within the range from the field holding capacity to the wilting point as the overall drought susceptibility index of the target soil sample.

[0011] The present invention also provides a device for determining soil drought resistance, comprising the following modules: A calculation module, for determining a specific drought susceptibility index of the target soil sample under a specific moisture content state based on the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The determination module is used to determine the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample.

[0012] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, any of the above methods for determining soil drought resistance is implemented.

[0013] The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for determining soil drought resistance as described in any one of the above is implemented.

[0014] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for determining soil drought resistance as described above is implemented.

[0015] The present invention provides a method, device, equipment and storage medium for determining soil drought resistance. The method determines a specific drought susceptibility index of a target soil sample under a specific moisture content state according to the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample. The index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system per unit time. Based on the specific drought susceptibility index, the soil drought resistance can be comprehensively and accurately quantitatively evaluated, providing a theoretical basis and practical guidance for the comparison and improvement of soil drought resistance in agricultural production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic flow chart of the method for determining soil drought resistance provided by the present invention.

[0018] Figure 2 It is a schematic diagram of the hydraulic properties of two red soils to be evaluated provided by the present invention.

[0019] Figure 3 It is a schematic diagram of the calculation interface of two red soil drought susceptibility indicators provided by the present invention in Excel.

[0020] Figure 4 The present invention provides two red soil drought susceptibility indicators Schematic representation of the evaluation results.

[0021] Figure 5 It is a structural schematic diagram of the device for determining soil drought resistance provided by the present invention.

[0022] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Figure 1 Schematic diagram of the process of determining soil drought resistance provided by the present invention. Figure 1 As shown, the method comprises the following steps: Step 100: Determine a specific drought susceptibility index of the target soil sample under a specific moisture content state based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time.

[0025] Step 101: Determine the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample.

[0026] Specifically, in order to better understand the solution provided by the present invention, the inventive concept of the present invention is firstly explained.

[0027] The ease with which crop roots absorb water from the soil can directly characterize the drought resistance of the soil. The easier it is for crops to absorb soil water, the less susceptible they are to drought. However, the ease with which crops absorb soil water is an abstract concept, and its specific meaning has no unified definition, nor is there an indicator to quantify it, so it cannot be used to evaluate the drought resistance of the soil. The embodiments of the present invention solve this technical problem by realizing the abstract concept of soil drought resistance as a specific and operational indicator.

[0028] The soil drought susceptibility index is based on the following ideas and objective realities: soil moisture is retained in the soil by soil matrix suction (matrix potential takes a positive value). Crops need to transfer soil moisture to the root surface first to absorb water. This process causes the soil water content to decrease and the water energy to decrease (matrix potential decreases). To continue the water transfer process, crops need to continuously provide energy to compensate, such as reducing the root water potential to resist the decrease in soil matrix potential to maintain the movement of water from the soil to the roots. The energy power consumed by the crop in this process must be equal to the energy power of the soil moisture reduction. The energy power compensated by the crop in order to transfer soil moisture is at the expense of its own stress. Therefore, the power of the soil moisture energy reduction caused by the root system transferring soil moisture can be used to evaluate soil drought susceptibility.

[0029] The soil drought susceptibility index constructed by the present invention is a quantitative indication of soil drought resistance, which indicates the ease with which soil properties cause crop drought during drought, that is, the ease with which crop roots remove water from the soil.

[0030] The target soil sample is a soil sample whose cold resistance needs to be determined. The embodiment of the present invention can use the soil hydraulic properties of the target soil sample as the data basis, and determine the specific drought susceptibility index of the target soil sample under a specific water content state according to the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample. The specific drought susceptibility index indicates the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time.

[0031] The volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample can be measured by conventional standard laboratory methods, which are not limited in the embodiments of the present invention.

[0032] It is understandable that the soil drought susceptibility index quantifies the difficulty of crops to remove water from the soil to the root surface, and quantitatively indicates the soil's drought resistance. The lower the soil drought susceptibility, the lower the cost for crops to remove the same amount of water, the less likely the crops are to suffer from drought, and the stronger the soil's drought resistance.

[0033] That is to say, the lower the specific drought susceptibility index value under a specific water content state, the stronger the drought resistance of the target soil under the specific water content state; the higher the specific drought susceptibility index value under a specific water content state, the lower the drought resistance of the target soil under the specific water content state. Therefore, the drought resistance of the target soil sample can be determined according to the specific drought susceptibility index of the target soil sample.

[0034] Optionally, a curve graph between the specific drought susceptibility index value and the water content can be drawn to more intuitively represent the drought resistance of the target soil sample.

[0035] The method for determining soil drought resistance provided by the present invention determines a specific drought susceptibility index of a target soil sample under a specific moisture content state according to the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample. The index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system per unit time. Based on the specific drought susceptibility index, the soil drought resistance can be comprehensively and accurately quantitatively evaluated, providing a theoretical basis and practical guidance for the comparison and improvement of soil drought resistance in agricultural production.

[0036] A method for determining soil drought resistance provided by the present invention determines a specific drought susceptibility index of a target soil sample under a specific moisture content state based on the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, including: Based on the exponential function and the saturated water content of the target soil sample, the soil water retention curve of the target soil sample is fitted to obtain the soil water retention curve equation; Determine the soil hydraulic conductivity curve equation based on the saturated hydraulic conductivity and saturated water content of the target soil sample; Determine the change in soil water free energy based on the soil water retention curve equation and the volume of the target soil sample; Calculate water flux based on the soil water retention curve equation and soil hydraulic conductivity curve equation; Based on the water flux, water balance equation and soil moisture free energy change, the specific drought susceptibility index of the target soil sample under a specific moisture content state is calculated.

[0037] Specifically, in the process of calculating the specific drought susceptibility index of the target soil sample under a specific moisture content state, the soil water retention curve of the target soil sample can be first fitted according to the exponential function and the saturated moisture content of the target soil sample to obtain the soil water retention curve equation.

[0038] Alternatively, the soil water retention curve equation is expressed by the following formula: In the formula, The volumetric water content of soil is The soil matrix suction, represents the saturated water content of the target soil sample, and is the fitting coefficient, which can be obtained by fitting the experimental data.

[0039] Then, the relationship between soil hydraulic conductivity and water content can be determined through the saturated hydraulic conductivity and saturated water content of the target soil sample, and the soil hydraulic conductivity curve equation can be obtained.

[0040] Optionally, the soil hydraulic conductivity curve equation is expressed by the following formula: In the formula, The volumetric water content of soil is Soil hydraulic conductivity; represents the saturated water content of the target soil sample, represents the saturated hydraulic conductivity of the target soil sample; is the fitting coefficient obtained from the soil water retention curve equation.

[0041] After obtaining the soil water retention curve equation, the change in soil water free energy can be calculated based on the soil water retention curve equation and the volume of the target soil sample. To the root surface, resulting in the change in soil water free energy At this time, the soil moisture content changes from Down to (Correspondingly, the matrix suction changes from Reduced to ).

[0042] Optionally, the change in soil moisture free energy is expressed by the following formula: In the formula, represents the change in soil moisture free energy, represents the volume of the target soil sample, is the density of water, usually 1000kg / m³; is the acceleration due to gravity, which is about 9.81m / s²; The volumetric water content of soil is The soil matrix suction is obtained through the soil water retention curve equation.

[0043] Soil moisture free energy change It can be calculated by numerical integration, and the unit is joule (J). In order to stabilize the calculation results, Down to The recommended drop in soil moisture content is 0.001~0.005 m 3 / m 3 The value between , depending on soil type).

[0044] Calculate crop water flux Removes tiny amounts of water from the soil at a rate of The time required to reach the root surface is , the volume is The change of soil moisture content satisfies the water balance equation: Among them, water flow It can be calculated using the Darcy law formula based on the soil water retention curve equation and the soil hydraulic conductivity curve equation: in, The soil moisture content is Down to The average water content during the period (correspondingly, the matrix suction Reduced to ) under soil hydraulic conductivity.

[0045] After obtaining the water flux, water balance equation and soil water free energy change, these three calculation formulas can be combined to calculate the specific drought susceptibility index of the target soil sample under a specific water content state. The formula obtained is as follows: Understandably, The water content of the target soil sample is equal to and Average water content Specific drought susceptibility index value at that time.

[0046] According to a method for determining soil drought resistance provided by the present invention, the drought resistance of a target soil sample is determined based on a specific drought susceptibility index of the target soil sample, comprising: Determine the overall drought susceptibility index of the target soil sample based on the specific drought susceptibility index, the field holding capacity of the target soil sample, and the wilting point of the target soil sample; Based on the overall drought susceptibility index of the target soil sample, the drought resistance of the target soil sample is determined.

[0047] Specifically, the field water holding capacity of the target soil sample and the wilting point of the target soil sample can represent the effective water content range of the target soil sample. Therefore, the specific drought susceptibility index under the field water holding capacity state and the specific drought susceptibility index under the wilting point state can be calculated respectively according to the target soil sample.

[0048] Then, the specific drought susceptibility index under the field holding capacity state and the specific drought susceptibility index under the wilting point state are calculated according to the target soil samples, and the overall drought susceptibility index of the target soil samples is determined.

[0049] That is to say, the lower the overall drought susceptibility index value of the target soil sample, the stronger the drought resistance of the target soil within the effective water content range; the higher the overall drought susceptibility index of the target soil sample, the lower the drought resistance of the target soil within the effective water content range. Therefore, the drought resistance of the target soil sample can be determined according to the overall drought susceptibility index of the target soil sample.

[0050] According to a method for determining soil drought resistance provided by the present invention, based on a specific drought susceptibility index, the field water holding capacity of the target soil sample and the wilting point of the target soil sample, the overall drought susceptibility index of the target soil sample is determined, including: The arithmetic mean of the specific drought susceptibility index values ​​within the range from field holding capacity to wilting point was calculated as the overall drought susceptibility index of the target soil sample.

[0051] Specifically, in the process of calculating the overall drought susceptibility index of the target soil sample, the average energy power required to transfer all the effective water from the soil volume V to the root surface can be calculated: .

[0052] The calculation method is to calculate the above mentioned The value is taken as the arithmetic mean and divided by the total effective water volume (i.e. FC-WP). The calculation formula is: Calculation results Represents the overall drought susceptibility of the soil sample to be evaluated, with the unit being watt (W).

[0053] The method for determining soil drought resistance provided by the present invention is further explained below through examples in specific application scenarios.

[0054] In the specific implementation process, the steps include soil sample collection, soil property measurement, drought susceptibility index construction and index calculation.

[0055] The first step is to collect the soil to be evaluated in the field. Use a special standard ring knife to collect undisturbed original soil samples. The number of samples collected is 6, and the volume of each soil sample is 100 cm 3 .

[0056] The second step is to measure the saturated hydraulic conductivity and soil water retention curve of the aforementioned ring cut soil samples in the laboratory using conventional standard methods. Three of the ring cut samples were first used to measure the saturated water content. Then the saturated hydraulic conductivity was measured by the constant head method. (Unit: m / s), take the average value; the other 3 samples are used to measure the soil water holding curve, using a sandbox and a pressure membrane instrument (or a high-speed centrifuge equipped with a special ring blade rotor, select an instrument according to the laboratory equipment) to measure the water content when the soil matrix suction is 10, 20, 30, 50, 100, 500, 1000, 1500 kPa, and take the average value of three measurements at each suction to draw the matrix suction-water content curve (i.e., soil water holding curve). The soil water content corresponding to the suction of 30 kPa is the field water holding capacity FC, and the soil water content corresponding to 1500 kPa is the wilting point WP, and the difference between the field water holding capacity and the wilting point (FC-WP) is calculated as the total effective water content of the soil to be evaluated.

[0057] Step 3: Use the exponential equation Fit the soil water retention curve mentioned above. Among them, is the soil matrix suction (unit water column height, m), is the volumetric water content of soil (unit: m 3 / m 3 ), and is the fitting coefficient.

[0058] Step 4: Use the equation Establishing soil hydraulic conductivity Matrix suction This relationship can be used to calculate the hydraulic conductivity of soil at any water content or any matrix suction, which is used in the subsequent steps to calculate the water flux using Darcy's law.

[0059] Step 5: Calculate the amount of water removed from the soil The energy power required to reach the root surface (Unit: W), at this time the soil moisture content changes from Down to (Correspondingly, the matrix suction changes from Reduced to ). In order to stabilize the calculation results, Down to The recommended drop in soil moisture content is 0.001~0.005 m 3 / m 3 The value between , depending on soil type). The calculation formula is: in, and is the fitting coefficient in the previous step, is the specific gravity of water (equal to 1000 kg / m 3 ), is the acceleration due to gravity (equal to 9.81 m / s 2 ), for and The average soil moisture content (m 3 / m 3 ), is the saturated hydraulic conductivity (m / s), Water content Soil hydraulic conductivity (m / s) at 1000 s, matrix suction takes positive value and unit is water column height (m), all variables are unified into meter-kilogram system, and finally The unit is watt (W). Calculation result The soil moisture content to be evaluated is equal to and Average water content Susceptibility to drought.

[0060] At different water contents, the The index value is variable, and the different moisture contents within the entire effective moisture content range are calculated. Next Value, draw ~ Curve, thus obtaining the drought susceptibility index of the soil to be evaluated at any water content between field water holding capacity and wilting point.

[0061] Step 6: Calculate the average energy power required to transfer all effective water from unit volume V of soil to the root surface. (Unit: W). The calculation formula is: in, It is from field capacity FC to wilting point WP For any soil to be evaluated, the calculated result is It is a fixed value that represents the overall drought susceptibility of the soil sample to be evaluated. The smaller the value, the less susceptible the soil is to drought (less likely to cause crop drought); the larger the value, the higher the soil's drought susceptibility (more likely to cause crop drought).

[0062] During the experiment, two types of red soils with different drought resistance were selected as the soils to be evaluated. One is a clay red soil developed from Quaternary red clay parent material, collected from Xianning City, Hubei Province, Xianning District (30°01'N, 114°21'E), and the other is a sandy red soil developed from red sandstone weathering parent material, collected from Yujiang District, Yingtan City, Jiangxi Province (28°17'N, 116°56'E). When collecting soil samples, 100 cm 3 The soil samples were collected in six portions in each tillage layer in the field using a standard centrifuge ring knife. The samples were sealed and brought back to the laboratory. The soil samples were collected using standard conventional methods.

[0063] The collected soil samples are placed in a flat-bottomed water absorption tray, and deionized water is injected from the bottom to allow the soil to absorb water from the bottom of the ring until the soil sample is saturated. The specific operation refers to the standard conventional method. After measuring the saturated water content of a part of the ring samples, continue to measure the saturated hydraulic conductivity using the constant head method, using the mature standard method described in textbooks, national standards or literature.

[0064] A portion of the ring cutter soil samples were saturated and the soil water retention curve was measured using a high-speed centrifuge. The specific operation was based on the method described in the references. The water content when the matrix suction was 10, 20, 30, 50, 100, 500, 1000, and 1500 kPa (i.e., the water column height was 1, 2, 3, 5, 10, 50, 100, and 150 m) was obtained. The exponential model was used to calculate the water content. Fitting, the results are shown in Figure 2 . Figure 2 The figure is a schematic diagram of the hydraulic properties of two red soils to be evaluated provided by the present invention. The figure shows the water retention curves of the clay red soil and the sandy red soil obtained by laboratory measurement results and exponential model fitting, as well as the hydraulic conductivity curve obtained by fitting.

[0065] The exponential model is further used to obtain the relationship between hydraulic conductivity and water content. For clay red soil, the fitting parameters =0.3846, =12.7570, saturated hydraulic conductivity =1.6737×10 -6 m / s, field capacity FC = 0.3229 m 3 / m 3 , wilting point WP = 0.2321 m 3 / m 3 ; For sandy red soil, the fitting parameters =0.5221, =8.0716, saturated hydraulic conductivity =3.9433×10 -6 m / s, field capacity FC = 0.3113 m 3 / m3 , wilting point WP = 0.1817 m 3 / m 3 .

[0066] Using the aforementioned Drought Susceptibility Index . The calculation starts from the field capacity FC (i.e. =FC), = -0.001, the water content decreases by 0.001 m 3 / m 3 Calculate a , and obtain a series of The calculation process is a simple arithmetic operation. To be fast and accurate, a calculation program is compiled in Excel 2016 to automatically perform the calculation. The calculation interface is as follows: Figure 3 shown. Figure 3 The figure is a schematic diagram of the calculation interface of the two red soil drought susceptibility indices provided by the present invention in Excel. The calculation of the indices constructed in this embodiment is automatically calculated by compiling a calculation program in Excel software.

[0067] This embodiment can be drawn in Excel 2016 ~ The curve results are as follows Figure 4 shown. Figure 4 The present invention provides two red soil drought susceptibility indicators Schematic representation of the evaluation results. Figure 4 Showing the soil drought susceptibility index of two red soils The relationship between soil moisture and soil content. The overall drought susceptibility indexes of the two red soils are: 1.260 for clay red soil and 2.707 for sandy red soil. Sandy red soil is more likely to cause crop drought than clay red soil.

[0068] Using the above formula Calculate the overall soil drought susceptibility index For clay red soil, =1.260; for sandy red soil, =2.707. The drought resistance of clay red soil is stronger than that of sandy red soil. This evaluation result is consistent with the traditional qualitative evaluation of the drought resistance of the two soils by relevant literature and professionals.

[0069] The soil drought resistance capacity determination device provided by the present invention is described below. The soil drought resistance capacity determination device described below and the soil drought resistance capacity determination method described above can be referenced to each other.

[0070] Figure 5 Schematic diagram of the structure of the device for determining soil drought resistance provided by the present invention. Figure 5 As shown, the device includes the following modules: The calculation module 500 is used to determine a specific drought susceptibility index of the target soil sample under a specific moisture content state based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The determination module 510 is used to determine the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample.

[0071] According to a soil drought resistance determination device provided by the present invention, the drought resistance of a target soil sample is determined based on a specific drought susceptibility index of the target soil sample, comprising: Determine the overall drought susceptibility index of the target soil sample based on the specific drought susceptibility index, the field holding capacity of the target soil sample, and the wilting point of the target soil sample; Based on the overall drought susceptibility index of the target soil sample, the drought resistance of the target soil sample is determined.

[0072] A soil drought resistance determination device provided by the present invention determines a specific drought susceptibility index of a target soil sample under a specific moisture content state based on the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, including: Based on the exponential function and the saturated water content of the target soil sample, the soil water retention curve of the target soil sample is fitted to obtain the soil water retention curve equation; Determine the soil hydraulic conductivity curve equation based on the saturated hydraulic conductivity and saturated water content of the target soil sample; Determine the change in soil water free energy based on the soil water retention curve equation and the volume of the target soil sample; Calculate water flux based on the soil water retention curve equation and soil hydraulic conductivity curve equation; Based on the water flux, water balance equation and soil moisture free energy change, the specific drought susceptibility index of the target soil sample under a specific moisture content state is calculated.

[0073] According to a soil drought resistance determination device provided by the present invention, the soil water retention curve equation is expressed by the following formula: The soil hydraulic conductivity curve equation is expressed by the following formula: In the formula, The volumetric water content of soil is The soil matrix suction, The volumetric water content of soil is Soil hydraulic conductivity; represents the saturated water content of the target soil sample, represents the saturated hydraulic conductivity of the target soil sample; and is the fitting coefficient.

[0074] According to a soil drought resistance determination device provided by the present invention, the change in soil moisture free energy is expressed by the following formula: In the formula, represents the change in soil moisture free energy, represents the volume of the target soil sample, is the density of water, is the acceleration due to gravity, The volumetric water content of soil is soil matrix suction.

[0075] According to a soil drought resistance determination device provided by the present invention, based on a specific drought susceptibility index, the field water holding capacity of the target soil sample and the wilting point of the target soil sample, the overall drought susceptibility index of the target soil sample is determined, including: The arithmetic mean of the specific drought susceptibility index values ​​within the range from field holding capacity to wilting point was calculated as the overall drought susceptibility index of the target soil sample.

[0076] Figure 6 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 6 As shown, the electronic device may include: a processor 610, a communications interface 620, a memory 630 and a communication bus 640, wherein the processor 610, the communications interface 620 and the memory 630 communicate with each other through the communication bus 640. The processor 610 may call the logic instructions in the memory 630 to execute the method for determining the soil drought resistance, which includes: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, the specific drought susceptibility index of the target soil sample under a specific water content state is determined; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The drought resistance of the target soil sample is determined based on the specific drought susceptibility index of the target soil sample.

[0077] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0078] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the soil drought resistance determination method provided by the above methods, the method comprising: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, the specific drought susceptibility index of the target soil sample under a specific water content state is determined; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The drought resistance of the target soil sample is determined based on the specific drought susceptibility index of the target soil sample.

[0079] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the soil drought resistance determination method provided by the above methods, the method comprising: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, the specific drought susceptibility index of the target soil sample under a specific water content state is determined; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The drought resistance of the target soil sample is determined based on the specific drought susceptibility index of the target soil sample.

[0080] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0081] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining soil drought resistance, characterized in that: include: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, determining a specific drought susceptibility index of the target soil sample under a specific water content state; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The drought resistance of the target soil sample is determined based on the specific drought susceptibility index of the target soil sample.

2. The method for determining soil drought resistance according to claim 1, characterized in that: The step of determining the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample comprises: Determining an overall drought susceptibility index of the target soil sample based on the specific drought susceptibility index, the field holding capacity of the target soil sample, and the wilting point of the target soil sample; Based on the overall drought susceptibility index of the target soil sample, the drought resistance of the target soil sample is determined.

3. The method for determining soil drought resistance according to claim 1 or 2, characterized in that: Based on the volume, saturated water content, saturated hydraulic conductivity and soil water retention curve of the target soil sample, a specific drought susceptibility index of the target soil sample under a specific water content state is determined, including: Fitting a soil water retention curve of the target soil sample based on an exponential function and the saturated water content of the target soil sample to obtain a soil water retention curve equation; Determining a soil hydraulic conductivity curve equation based on the saturated hydraulic conductivity and saturated water content of the target soil sample; Determining a change in soil moisture free energy based on the soil water retention curve equation and the volume of the target soil sample; Calculating water flux based on the soil water retention curve equation and the soil hydraulic conductivity curve equation; Based on the water flux, the water balance equation and the change in soil moisture free energy, a specific drought susceptibility index of the target soil sample under a specific moisture content state is calculated.

4. The method for determining soil drought resistance according to claim 3, characterized in that: The soil water retention curve equation is expressed by the following formula: The soil hydraulic conductivity curve equation is expressed by the following formula: In the formula, The volumetric water content of soil is The soil matrix suction, The volumetric water content of soil is Soil hydraulic conductivity; represents the saturated water content of the target soil sample, represents the saturated hydraulic conductivity of the target soil sample; and is the fitting coefficient.

5. The method for determining soil drought resistance according to claim 4, characterized in that: The soil moisture free energy change is expressed by the following formula: In the formula, represents the change in soil moisture free energy, represents the volume of the target soil sample, is the density of water, is the acceleration due to gravity, The volumetric water content of soil is soil matrix suction.

6. The method for determining soil drought resistance according to claim 2, characterized in that: Determining an overall drought susceptibility index of the target soil sample based on the specific drought susceptibility index, the field holding capacity of the target soil sample, and the wilting point of the target soil sample includes: The arithmetic mean of the specific drought susceptibility index values ​​is calculated within the range from the field holding capacity to the wilting point as the overall drought susceptibility index of the target soil sample.

7. A device for determining soil drought resistance, characterized in that: include: A calculation module, for determining a specific drought susceptibility index of the target soil sample under a specific moisture content state based on the volume, saturated moisture content, saturated hydraulic conductivity and soil water retention curve of the target soil sample; the specific drought susceptibility index represents the power required to transfer a unit amount of water from a unit volume of the target soil sample to the surface of the crop root system in a unit time; The determination module is used to determine the drought resistance of the target soil sample based on the specific drought susceptibility index of the target soil sample.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the method for determining soil drought resistance according to any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining soil drought resistance according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for determining soil drought resistance according to any one of claims 1 to 6 is implemented.

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