Vegetation management method and device based on dynamic threshold value, terminal equipment and storage medium

Abstract

The invention discloses a vegetation management method and device based on a dynamic threshold value, terminal equipment and a storage medium, and belongs to the technical field of ecological hydrology and vegetation management. The method comprises the steps that the soil layer water content, the to-be-managed vegetation area, the underground water level amplitude, the underground water aquifer area, the current precipitation amount, the current soil heat flux, the daily average temperature, the wind speed, the daily saturation water vapor pressure, the actual water vapor pressure, the vegetation surface net radiation and the vegetation canopy area are obtained, and a water source utilization proportion dynamic threshold value is calculated; then obtaining the actual utilization ratio of each to-be-managed vegetation to each potential water source; and finally, respectively comparing the dynamic threshold value of the water source utilization ratio with each actual utilization ratio, performing score assignment and grading according to a comparison result, and managing the vegetation to be managed. According to the invention, the accuracy and rationality of the vegetation management method can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ecohydrology and vegetation management, and in particular to a vegetation management method, device, terminal equipment and storage medium based on dynamic thresholds. Background Art

[0002] Under the dual influence of global climate change and intensified human activities, the relationship between vegetation and water resources has become a core research topic in ecohydrology and vegetation management. In arid regions, where the ecological environment is extremely fragile, the contradiction between water shortages and the ecological needs of vegetation is particularly prominent. Optimizing vegetation management based on local water resources is crucial to ensuring regional ecological security and sustainable development.

[0003] Existing techniques typically manage vegetation by analyzing its water utilization. Based on empirical experience, a fixed threshold for water utilization is set to determine the intensity of competition for water among local vegetation. This information is then used to formulate appropriate vegetation management methods. However, in practice, due to the uneven spatial and temporal distribution of water resources, water resources are dynamically changing. This increases the risk of misjudgment when using fixed threshold analysis, reducing the accuracy and rationality of the resulting vegetation management methods. Summary of the Invention

[0004] The present invention provides a vegetation management method, device, terminal device and storage medium based on dynamic thresholds, which can solve the problem in the prior art that a fixed water source utilization ratio threshold is used to compare with the actual utilization ratio, which may cause errors in the comparison results due to the uneven temporal and spatial distribution of water sources, and then lead to misjudgment, thereby reducing the accuracy and rationality of the final vegetation management method.

[0005] An embodiment of the present invention provides a vegetation management method based on a dynamic threshold, comprising:

[0006] S1. Obtain the soil moisture content and vegetation area to be managed corresponding to each soil layer according to several preset soil layer depths, and simultaneously obtain the current groundwater level fluctuation and current precipitation;

[0007] S2. Calculate the potential water source water storage based on the preset soil depth, soil moisture content, vegetation area to be managed, water level fluctuation, and precipitation;

[0008] S3. Obtain the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water demand of the vegetation to be managed;

[0009] S4. Calculate the proportion of available water sources for the vegetation to be managed based on the potential water source reserves and the current total water demand. Calculate the dynamic threshold of the water source utilization ratio for the vegetation to be managed based on the proportion of available water sources and the number of potential water sources.

[0010] S5. Obtain the actual utilization ratio of each potential water source by each vegetation to be managed;

[0011] S6. Compare the dynamic threshold of water source utilization ratio with the actual utilization ratio of each potential water source by each vegetation to be managed, and manage each vegetation to be managed based on the comparison results.

[0012] Furthermore, the potential water source water reserves are calculated based on the preset soil depth, soil moisture content, vegetation area to be managed, water level fluctuation, and precipitation, including:

[0013] Calculate the soil water storage capacity based on the above-mentioned preset soil depth, soil moisture content and the area of ​​vegetation to be managed;

[0014] The amount of groundwater that can be extracted is calculated based on the above water level fluctuations and the area of ​​vegetation to be managed;

[0015] The above-mentioned potential water source water reserves are obtained based on the sum of the above-mentioned soil water storage capacity, the above-mentioned groundwater exploitable capacity and the above-mentioned precipitation.

[0016] Furthermore, the above obtains the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculates the current total water demand of the vegetation to be managed, including:

[0017] Obtaining a preset temperature-saturated water vapor pressure relationship curve, and determining the slope of a tangent line at the above-mentioned average daily temperature from the above-mentioned preset temperature-saturated water vapor pressure relationship curve;

[0018] The crop evapotranspiration of the vegetation to be managed is calculated based on the above slope, soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface;

[0019] Based on the above crop evapotranspiration and the above area of ​​vegetation to be managed, the current total water demand of the vegetation to be managed is calculated.

[0020] Furthermore, the above-mentioned acquisition of the actual utilization ratio of each potential water source by each vegetation to be managed includes:

[0021] Obtain the first isotope values ​​of xylem water in the vegetation to be managed, and the second isotope values ​​of all potential water sources;

[0022] The first isotope value and the second isotope value are input into a preset MixSIAR model to obtain the actual utilization ratio of each potential water source by each vegetation to be managed.

[0023] Furthermore, the dynamic threshold of water source utilization ratio is compared with the actual utilization ratio of each potential water source by each vegetation to be managed, and each vegetation to be managed is managed according to the comparison result, including:

[0024] For each potential water source, if the actual utilization ratio of any two to-be-managed vegetation of the potential water source is greater than the corresponding dynamic threshold of water source utilization ratio, a first preset score is assigned to the water competition intensity between the two to-be-managed vegetation; otherwise, a second preset score is assigned to the water competition intensity between the two to-be-managed vegetation; wherein the first preset score and the second preset score are different in magnitude;

[0025] The total competition intensity score is calculated based on the sum of all the above water competition intensity scores;

[0026] Based on the above-mentioned proportion of available water sources and the above-mentioned total competition intensity score, the competition intensity level is determined, and vegetation management is carried out according to the above-mentioned competition intensity level.

[0027] Furthermore, the competition intensity level is determined based on the available water source ratio and the total competition intensity score, and vegetation management is performed based on the competition intensity level, including:

[0028] When the total competition intensity score is the first preset score, the competition intensity level is determined to be no competition, and the status quo of all vegetation to be managed is maintained;

[0029] If the total competition intensity score is the second preset score and the available water source ratio is not less than the preset first available water source ratio threshold, the competition intensity level is determined to be mild competition, all vegetation to be managed is monitored in real time, and an early warning is issued when water shortage is found in the vegetation to be managed;

[0030] When the total competition intensity score is the second preset score, the available water source ratio is less than the preset first available water source ratio threshold, and the available water source ratio is greater than the preset second available water source ratio threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized; wherein the preset first available water source ratio threshold is greater than the preset second available water source ratio threshold;

[0031] When the total competition intensity score is the second preset score and the available water source ratio is not greater than the preset second available water source ratio threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed;

[0032] If the total competition intensity score is not less than the third preset score, and the available water source ratio is not less than the preset first available water source ratio threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized;

[0033] If the total competition intensity score is not less than the third preset score, the available water source ratio is less than the first preset available water source ratio threshold, and the available water source ratio is greater than the second preset available water source ratio threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed;

[0034] When the above-mentioned total competition intensity score is not less than the third preset score and the above-mentioned available water source proportion is not greater than the above-mentioned preset second available water source proportion threshold, the above-mentioned competition intensity level is determined to be extreme competition, and a preset number of vegetation to be managed are removed from all vegetation to be managed; wherein the above-mentioned first preset score, the second preset score and the third preset score are different in size.

[0035] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0036] The present invention provides a vegetation management device based on a dynamic threshold, comprising:

[0037] Data acquisition module, potential water source water storage calculation module, total water source demand calculation module, water source utilization ratio dynamic threshold calculation module, actual utilization ratio acquisition module and vegetation management module;

[0038] The data acquisition module is used to obtain the soil moisture content and the area of ​​vegetation to be managed corresponding to each soil layer according to a number of preset soil layer depths, and also obtain the current groundwater level fluctuation and current precipitation;

[0039] The potential water source water storage calculation module is used to calculate the potential water source water storage based on the preset soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation and precipitation;

[0040] The total water demand calculation module is used to obtain the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water demand of the vegetation to be managed;

[0041] The water source utilization ratio dynamic threshold calculation module is used to calculate the available water source ratio of the vegetation to be managed based on the water storage of the potential water source and the current total water demand, and calculate the dynamic threshold of the water source utilization ratio of the vegetation to be managed based on the available water source ratio and the amount of water sources of the potential water source;

[0042] The above-mentioned actual utilization ratio acquisition module is used to obtain the actual utilization ratio of each potential water source by each vegetation to be managed;

[0043] The vegetation management module is used to compare the dynamic threshold of water source utilization ratio with the actual utilization ratio of each potential water source by each vegetation to be managed, and manage the vegetation to be managed according to the comparison results.

[0044] Furthermore, the potential water source water reserve calculation module includes:

[0045] Soil water storage calculation unit, groundwater exploitable volume calculation unit and water volume calculation unit;

[0046] The soil water storage capacity calculation unit is used to calculate the soil water storage capacity based on the preset soil layer depth, soil layer water content and the area of ​​vegetation to be managed;

[0047] The groundwater exploitable volume calculation unit is configured to calculate the groundwater exploitable volume based on the water level fluctuation and the vegetation area to be managed;

[0048] The water volume calculation unit is used to obtain the potential water source water reserves based on the sum of the soil water storage, the exploitable groundwater volume and the precipitation.

[0049] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment;

[0050] The present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the vegetation management method based on dynamic thresholds described in any embodiment of the present invention.

[0051] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0052] The present invention provides a storage medium comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, a vegetation management method based on a dynamic threshold according to any embodiment of the present invention is implemented.

[0053] The embodiments of the present invention have the following beneficial effects:

[0054] The present invention provides a vegetation management method, apparatus, terminal device, and storage medium based on dynamic thresholds. The method comprises: S1, obtaining the soil moisture content and the vegetation area to be managed corresponding to each soil layer according to a number of preset soil layer depths, and simultaneously obtaining the current groundwater level fluctuation and the current precipitation;

[0055] S2. Calculate the potential water source water storage based on the above-mentioned preset soil layer depth, soil layer moisture content, area of ​​vegetation to be managed, water level fluctuation and precipitation; S3. Obtain the current soil heat flux, average daily temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water source demand of the vegetation to be managed; S4. Calculate the proportion of available water sources for the vegetation to be managed based on the above-mentioned potential water source water storage and the current total water source demand, and calculate the dynamic threshold value of the water source utilization ratio of the vegetation to be managed based on the above-mentioned proportion of available water sources and the number of water sources of potential water sources; S5. Obtain the actual utilization ratio of each potential water source for each vegetation to be managed; S6. Compare the above-mentioned dynamic threshold value of water source utilization ratio with the above-mentioned actual utilization ratio of each potential water source for each vegetation to be managed, and manage each vegetation to be managed based on the comparison results. Therefore, the present invention calculates the current dynamic threshold of water source utilization ratio through the potential water source water reserves and the current total water source demand, so that the obtained dynamic threshold of water source utilization ratio can fully reflect the water source utilization situation in the area where the vegetation to be managed is currently located, and then makes the subsequent vegetation management method obtained based on this dynamic threshold conform to the actual situation of the current potential water source, thereby improving the accuracy and rationality of the vegetation management method. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0057] Figure 1 This is a flow chart of a vegetation management method based on dynamic thresholds provided by one embodiment of the present invention.

[0058] Figure 2 This is a structural diagram of a vegetation management device based on dynamic thresholds provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0062] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0066] See also Figure 1 To address the problem in the prior art of using a fixed water source utilization ratio threshold to compare with the actual utilization ratio, which may lead to errors in the comparison results due to the uneven temporal and spatial distribution of water sources, and thus cause misjudgment, thereby reducing the accuracy and rationality of the final vegetation management method, an embodiment of the present invention provides a vegetation management method based on a dynamic threshold, including:

[0067] Step S1: According to a number of preset soil layer depths, the soil moisture content and the area of ​​vegetation to be managed corresponding to each soil layer are obtained, and the current groundwater level fluctuation and the current precipitation are obtained;

[0068] Specifically, TDR (Time-Domain Reflectometry) soil moisture probes are installed within the soil layer at preset depths, collecting data every 30 minutes to determine the soil moisture content. TDR soil moisture probes can be installed in layers of 0-20cm, 20-50cm, and 50-100cm, so specific depth values ​​for the preset soil layers can be selected within these layers.

[0069] Specifically, a pressure water level gauge is used to monitor the groundwater level fluctuation, and a tipping bucket rain gauge is used to record precipitation in real time to obtain the current precipitation.

[0070] Preferably, data collection is set to occur every 30 minutes to ensure that the data obtained fully reflects the soil water content of the current potential water source. Using a pressure water level gauge to monitor groundwater level fluctuations in real time can reflect the groundwater content of the current potential water source in real time. Using a tipping bucket rain gauge to record precipitation in real time can also reflect the precipitation content of the current potential water source in real time.

[0071] Step S2: Calculate the potential water source water storage based on the preset soil depth, soil moisture content, vegetation area to be managed, water level fluctuation, and precipitation;

[0072] In a preferred embodiment, the potential water source water reserves are calculated based on the preset soil depth, soil moisture content, vegetation area to be managed, water level fluctuation, and precipitation, including:

[0073] Calculate the soil water storage capacity based on the above-mentioned preset soil depth, soil moisture content and the area of ​​vegetation to be managed;

[0074] Specifically, the soil water storage capacity is calculated according to the following formula:

[0075]

[0076] Where W represents the soil water storage capacity, N represents the total number of layers, i represents the i-th soil layer, θ i represents the soil moisture content of the i-th soil layer, d i represents the preset soil depth of the i-th soil layer, and A represents the area of ​​vegetation to be managed.

[0077] The amount of groundwater that can be extracted is calculated based on the above water level fluctuations and the area of ​​vegetation to be managed;

[0078] Specifically, the amount of groundwater that can be extracted is calculated according to the following formula:

[0079] Q k =μ·Δh·A

[0080] Where Q k represents the amount of groundwater that can be extracted, μ represents the water supply degree, and Δh represents the water level fluctuation.

[0081] The above-mentioned potential water source water reserves are obtained based on the sum of the above-mentioned soil water storage capacity, the above-mentioned groundwater exploitable capacity and the above-mentioned precipitation.

[0082] In this preferred embodiment, the soil water storage capacity, groundwater exploitable capacity and precipitation are calculated by presetting the soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation and precipitation, and then the potential water source water reserve is obtained based on the sum of the three.

[0083] Step S3: Obtain the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water demand of the vegetation to be managed;

[0084] Specifically, standard weather stations are deployed to achieve real-time monitoring of daily average temperature, wind speed, daily saturated vapor pressure, and actual vapor pressure. The standard weather stations use data from humidity sensors to determine daily saturated vapor pressure and actual vapor pressure, anemometers to determine wind speed, and temperature sensors to determine daily average temperature and soil heat flux.

[0085] Specifically, the above-mentioned vegetation to be managed includes Haloxylon ammodendron, Tamarix chinensis, etc.

[0086] In a preferred embodiment, the above-mentioned acquisition of the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculation of the current total water demand of the vegetation to be managed, includes:

[0087] Obtaining a preset temperature-saturated water vapor pressure relationship curve, and determining the slope of a tangent line at the above-mentioned average daily temperature from the above-mentioned preset temperature-saturated water vapor pressure relationship curve;

[0088] Specifically, the horizontal axis of the preset temperature-saturated water vapor pressure relationship curve is temperature, and the vertical axis is saturated water vapor pressure. The temperature equal to the average daily temperature is found from the horizontal axis of the relationship curve, and then the slope at this point can be determined.

[0089] The crop evapotranspiration of the vegetation to be managed is calculated based on the above slope, soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface;

[0090] Specifically, the crop transpiration is calculated by constructing the following Penman-Monteith formula:

[0091]

[0092] In the formula, ET0 represents crop transpiration, Δ represents the slope, and R n represents the net radiation of vegetation surface, G represents the soil heat flux, Y represents the hygrometer constant, T represents the average daily temperature, U2 represents the wind speed at 2m above the ground, e s represents the daily saturated water vapor pressure, e a Indicates the actual water vapor pressure.

[0093] Based on the above crop evapotranspiration and the above area of ​​vegetation to be managed, the current total water demand of the vegetation to be managed is calculated.

[0094] Specifically, the total water demand is calculated using the following formula:

[0095] Q=ET0×K c ×A

[0096] Where Q represents the total water demand, K c Indicates the preset crop factor.

[0097] In this preferred embodiment, the current total water demand of the vegetation to be managed is calculated through the current soil heat flux, average daily temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, area of ​​vegetation to be managed, and net radiation of the vegetation surface to be managed.

[0098] Step S4: Calculate the proportion of available water sources for the vegetation to be managed based on the water reserves of the potential water sources and the current total water demand. Calculate the dynamic threshold of the water utilization ratio of the vegetation to be managed based on the proportion of available water sources and the number of potential water sources.

[0099] Specifically, potential water sources include groundwater, soil water, and precipitation. Based on the quotient of the above potential water source reserves and the current total water demand, the proportion of available water sources for the vegetation to be managed is calculated, and then the proportion of available water sources is calculated using the following formula:

[0100]

[0101] In the formula, S represents the proportion of available water resources, S a Indicates potential source water reserves.

[0102] Specifically, the number of potential water sources is obtained, and based on the proportion of available water sources and the number of water sources, the dynamic threshold of water source utilization ratio is calculated using the following formula:

[0103]

[0104] Where T1 represents the dynamic threshold of water source utilization ratio, and n represents the number of water sources.

[0105] Preferably, the calculated dynamic threshold for water utilization ratio can respond to changes in resource pressure. For example, when the available water ratio S drops from 70% to 30%, the dynamic threshold for water utilization ratio T1 automatically decreases by 20%-35%, providing an early warning of potential competition risks. By dynamically adjusting the dynamic threshold for water utilization ratio, the determination of water competition intensity is dynamically sensitive to water scarcity, avoiding misjudgments during droughts.

[0106] Step S5: obtaining the actual utilization ratio of each potential water source by each vegetation to be managed;

[0107] In a preferred embodiment, obtaining the actual utilization ratio of each potential water source by each vegetation to be managed includes:

[0108] Obtain the first isotope values ​​of xylem water in the vegetation to be managed, and the second isotope values ​​of all potential water sources;

[0109] The first isotope value and the second isotope value are input into a preset MixSIAR model to obtain the actual utilization ratio of each potential water source by each vegetation to be managed.

[0110] Specifically, standardize the acquisition of xylem water from the vegetation to be managed and water samples from potential water sources, perform water extraction and isotope determination on them, and obtain the δ 2 H value, as the first isotope value mentioned above, to obtain the δ 18 The first isotope value is used as the mixture data, and the second isotope value is used as the source data. This is then input into the pre-set MixSIAR model, which outputs the actual utilization ratio of each potential water source by each managed vegetation.

[0111] In this preferred embodiment, the actual utilization ratio of each potential water source by each vegetation to be managed is obtained by obtaining the first isotope value, the second isotope value and the preset MixSIAR model.

[0112] Step S6: Compare the above dynamic threshold value of water source utilization ratio with the above actual utilization ratio of each potential water source by each vegetation to be managed, and manage each vegetation to be managed according to the comparison result.

[0113] In a preferred embodiment, the dynamic threshold of water source utilization ratio is compared with the actual utilization ratio of each potential water source by each vegetation to be managed, and each vegetation to be managed is managed according to the comparison result, including:

[0114] For each potential water source, if the actual utilization ratio of any two to-be-managed vegetation of the potential water source is greater than the corresponding dynamic threshold of water source utilization ratio, a first preset score is assigned to the water competition intensity between the two to-be-managed vegetation; otherwise, a second preset score is assigned to the water competition intensity between the two to-be-managed vegetation; wherein the first preset score and the second preset score are different in magnitude;

[0115] Preferably, the first preset score is set to 0 points, and the second preset score is set to 1 point.

[0116] The total competition intensity score is calculated based on the sum of all the above water competition intensity scores;

[0117] Specifically, the total competition intensity score is calculated using the following formula:

[0118]

[0119] Where C jk represents the total competition intensity score of vegetation j and k to be managed, m represents the mth potential water source, C m It represents the score of water competition intensity corresponding to the mth potential water source.

[0120] Based on the above-mentioned proportion of available water sources and the above-mentioned total competition intensity score, the competition intensity level is determined, and vegetation management is carried out according to the above-mentioned competition intensity level.

[0121] For example, if the current potential water sources are groundwater, precipitation, and soil water, respectively, and the current vegetation to be managed is Ephedra and Calligonum mongolicum, the available water source proportion S = 45%, and the dynamic threshold value of water source utilization ratio T1 = 0.38, the actual utilization ratio of groundwater by Ephedra obtained from the preset MixSIAR model is 50%, the actual utilization ratio of precipitation by Ephedra is 30%, and the actual utilization ratio of soil water by Ephedra is 20%; the actual utilization ratio of groundwater by Calligonum mongolicum is 40%, the actual utilization ratio of precipitation by Calligonum mongolicum is 45%, and the actual utilization ratio of soil water by Calligonum mongolicum is 15%. Then, through numerical comparison, it can be determined that for the potential water source of groundwater, since the actual utilization ratios of the two vegetations to be managed, Ephedra and Calligonum, respectively exceed the corresponding dynamic thresholds of water source utilization ratios, the water competition intensity between Ephedra and Calligonum is assigned 1 point; for the potential water source of precipitation, since the actual utilization ratio of precipitation by Ephedra is less than the dynamic threshold of water source utilization ratio, the water competition intensity between Ephedra and Calligonum is assigned 0 point; for the potential water source of soil water, the actual utilization ratios of the two vegetations to be managed, Ephedra and Calligonum, respectively are not greater than the corresponding dynamic thresholds of water source utilization ratios, therefore, the water competition intensity between Ephedra and Calligonum is also assigned 0 point, and the total competition intensity score is 1 point.

[0122] In this preferred embodiment, the dynamic threshold of the water source utilization ratio is compared with each actual utilization ratio to determine the total competition intensity score, and the management of the vegetation to be managed is achieved based on the total competition intensity score.

[0123] In another preferred embodiment, determining the competition intensity level based on the available water source ratio and the total competition intensity score, and performing vegetation management based on the competition intensity level includes:

[0124] When the total competition intensity score is the first preset score, the competition intensity level is determined to be no competition, and the status quo of all vegetation to be managed is maintained;

[0125] If the total competition intensity score is the second preset score and the available water source ratio is not less than the preset first available water source ratio threshold, the competition intensity level is determined to be mild competition, all vegetation to be managed is monitored in real time, and an early warning is issued when water shortage is found in the vegetation to be managed;

[0126] Preferably, the above-mentioned preset first available water source proportion threshold is 70%.

[0127] When the total competition intensity score is the second preset score, the available water source ratio is less than the preset first available water source ratio threshold, and the available water source ratio is greater than the preset second available water source ratio threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized; wherein the preset first available water source ratio threshold is greater than the preset second available water source ratio threshold;

[0128] Preferably, the above-mentioned preset second available water source proportion threshold is 30%.

[0129] When the total competition intensity score is the second preset score and the available water source ratio is not greater than the preset second available water source ratio threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed;

[0130] If the total competition intensity score is not less than the third preset score, and the available water source ratio is not less than the preset first available water source ratio threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized;

[0131] If the total competition intensity score is not less than the third preset score, the available water source ratio is less than the first preset available water source ratio threshold, and the available water source ratio is greater than the second preset available water source ratio threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed;

[0132] When the above-mentioned total competition intensity score is not less than the third preset score and the above-mentioned available water source proportion is not greater than the above-mentioned preset second available water source proportion threshold, the above-mentioned competition intensity level is determined to be extreme competition, and a preset number of vegetation to be managed are removed from all vegetation to be managed; wherein the above-mentioned first preset score, the second preset score and the third preset score are different in size.

[0133] Preferably, the first preset score is set to 0 points, the second preset score is set to 1 point, and the third preset score is set to 2 points.

[0134] For example, if the total competition intensity score is 1, and the available water source ratio is 45%, which is greater than the preset second available water source ratio threshold but less than the preset first available water source ratio threshold, the competition intensity is determined to be moderate. Irrigation methods for all managed vegetation are optimized. This means that while maintaining the total irrigation volume, drip irrigation, sprinkler irrigation, and other methods are used to precisely control the irrigation volume at different times to improve water use efficiency. If the competition intensity level is determined to be high, water replenishment is required, meaning that "water replenishment" means increasing the amount of irrigation water.

[0135] Indicatively, the hierarchical management table is constructed according to the above rules as follows:

[0136]

[0137] Preferably, the traditional method only divides the competition intensity into three levels: low, medium and high, which cannot accurately match the differentiated management needs. In this application, it is further divided into five levels: "no competition", "mild competition", "moderate competition", "high competition" and "extreme competition", which achieves more accurate differentiated management needs, reduces manual intervention when there is mild competition, and provides targeted water replenishment when there is high competition, thereby improving the efficiency of water resource utilization. In the process of quantifying the intensity of water competition, the potential water source water reserves and the total water source demand are used, so that the quantitative results achieve a comprehensive quantification of resource pressure. In addition, based on the proportion of available water sources and the intensity of competition, quantifiable management instructions (i.e., the "management strategy" in the above table) are generated, which improves the operability of decision-making.

[0138] In this preferred embodiment, the competition intensity level is determined based on the proportion of available water sources and the total competition intensity score, and corresponding management strategies are formulated for the vegetation to be managed based on the competition intensity level to manage the vegetation.

[0139] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0140] like Figure 2 As shown, an embodiment of the present invention provides a vegetation management device based on a dynamic threshold, comprising:

[0141] Data acquisition module, potential water source water storage calculation module, total water source demand calculation module, water source utilization ratio dynamic threshold calculation module, actual utilization ratio acquisition module and vegetation management module;

[0142] The data acquisition module is used to obtain the soil moisture content and the area of ​​vegetation to be managed corresponding to each soil layer according to a number of preset soil layer depths, and also obtain the current groundwater level fluctuation and current precipitation;

[0143] The potential water source water storage calculation module is used to calculate the potential water source water storage based on the preset soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation and precipitation;

[0144] The total water demand calculation module is used to obtain the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water demand of the vegetation to be managed;

[0145] The water source utilization ratio dynamic threshold calculation module is used to calculate the available water source ratio of the vegetation to be managed based on the water storage of the potential water source and the current total water demand, and calculate the dynamic threshold of the water source utilization ratio of the vegetation to be managed based on the available water source ratio and the amount of water sources of the potential water source;

[0146] The above-mentioned actual utilization ratio acquisition module is used to obtain the actual utilization ratio of each potential water source by each vegetation to be managed;

[0147] The vegetation management module is used to compare the dynamic threshold of water source utilization ratio with the actual utilization ratio of each potential water source by each vegetation to be managed, and manage each vegetation to be managed according to the comparison result.

[0148] In a preferred embodiment, the potential water source water reserve calculation module includes:

[0149] Soil water storage calculation unit, groundwater exploitable volume calculation unit and water volume calculation unit;

[0150] The soil water storage capacity calculation unit is used to calculate the soil water storage capacity based on the preset soil layer depth, soil layer water content and the area of ​​vegetation to be managed;

[0151] The groundwater exploitable volume calculation unit is configured to calculate the groundwater exploitable volume based on the water level fluctuation and the vegetation area to be managed;

[0152] The water volume calculation unit is used to obtain the potential water source water reserves based on the sum of the soil water storage, the exploitable groundwater volume and the precipitation.

[0153] It should be noted that the device embodiment described above is merely illustrative, wherein the modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, 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 present embodiment. In addition, in the drawings of the device embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without paying any creative work. The above schematic diagram is merely an example of a vegetation management device based on dynamic thresholds, and does not constitute a limitation on a vegetation management device based on dynamic thresholds. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0154] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment.

[0155] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the above-mentioned memory and configured to be executed by the above-mentioned processor. When the above-mentioned processor executes the above-mentioned computer program, it implements the above-mentioned vegetation management method based on dynamic thresholds in any embodiment of the present invention.

[0156] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the device.

[0157] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, or a cloud server. The device may include, but is not limited to, a processor and a memory;

[0158] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the device, connecting the various parts of the device using various interfaces and lines.

[0159] The above-mentioned memory can be used to store the above-mentioned computer programs and / or modules. The above-mentioned processor realizes various functions of the above-mentioned device by running or executing the computer programs and / or modules stored in the above-mentioned memory, and calling the data stored in the memory. The above-mentioned memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; in addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0160] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0161] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the vegetation management method based on dynamic thresholds described in any embodiment of the present invention.

[0162] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0163] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vegetation management method based on dynamic threshold, characterized in that: include: S1. Obtain the soil moisture content and vegetation area to be managed corresponding to each soil layer according to several preset soil layer depths, and simultaneously obtain the current groundwater level fluctuation and current precipitation; S2. Calculate the potential water source water storage based on the preset soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation, and precipitation; S3. Obtain the current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed, and calculate the current total water demand of the vegetation to be managed; S4. Calculate the proportion of available water sources for the vegetation to be managed based on the water reserves of the potential water source and the current total water demand, and calculate a dynamic threshold value of the water utilization ratio of the vegetation to be managed based on the proportion of available water sources and the number of water sources of the potential water source; S5. Obtain the actual utilization ratio of each potential water source by each vegetation to be managed; S6. Compare the dynamic threshold of water source utilization ratio with the actual utilization ratio of each potential water source by each vegetation to be managed, and manage each vegetation to be managed according to the comparison result.

2. The vegetation management method based on dynamic threshold according to claim 1, characterized in that: The potential water source water storage is calculated based on the preset soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation and precipitation, including: Calculating soil water storage capacity based on the preset soil layer depth, soil layer moisture content, and the area of ​​vegetation to be managed; Calculating the amount of groundwater that can be extracted based on the water level fluctuation and the area of ​​vegetation to be managed; The potential water source water reserve is obtained based on the sum of the soil water storage, the exploitable groundwater and the precipitation.

3. The vegetation management method based on dynamic threshold according to claim 2, characterized in that: The current soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface to be managed are obtained, and the current total water demand of the vegetation to be managed is calculated, including: Obtaining a preset temperature-saturated water vapor pressure relationship curve, and determining the slope of a tangent line at the average daily temperature from the preset temperature-saturated water vapor pressure relationship curve; Calculating the crop evapotranspiration of the vegetation to be managed based on the slope, soil heat flux, daily average temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, and net radiation of the vegetation surface; The current total water demand of the vegetation to be managed is calculated based on the crop evapotranspiration and the area of ​​the vegetation to be managed.

4. The vegetation management method based on dynamic threshold according to claim 3, characterized in that: The actual utilization ratio of each potential water source by each vegetation to be managed is obtained, including: Obtain the first isotope values ​​of xylem water in the vegetation to be managed, and the second isotope values ​​of all potential water sources; The first isotope value and the second isotope value are input into a preset MixSIAR model to obtain the actual utilization ratio of each potential water source by each vegetation to be managed.

5. The vegetation management method based on dynamic threshold according to claim 4, characterized in that: The step of comparing the water source utilization ratio dynamic threshold with the actual utilization ratio of each potential water source by each vegetation to be managed, and managing each vegetation to be managed according to the comparison result, includes: For each potential water source, if the actual utilization ratio of any two to-be-managed vegetation of the potential water source is greater than the corresponding dynamic threshold of water source utilization ratio, a first preset score is assigned to the water competition intensity between the two to-be-managed vegetation; otherwise, a second preset score is assigned to the water competition intensity between the two to-be-managed vegetation; wherein the first preset score and the second preset score are different in magnitude; Calculate the total competition intensity score based on the sum of all the water competition intensity scores; A competition intensity level is determined based on the proportion of available water sources and the total competition intensity score, and vegetation management is performed based on the competition intensity level.

6. The vegetation management method based on dynamic threshold according to claim 5, characterized in that: Determining a competition intensity level according to the available water source ratio and the total competition intensity score, and performing vegetation management according to the competition intensity level, includes: When the total competition intensity score is a first preset score, determining the competition intensity level as no competition, and maintaining the status quo for all vegetation to be managed; When the total competition intensity score is the second preset score and the available water source ratio is not less than the preset first available water source ratio threshold, the competition intensity level is determined to be mild competition, all vegetation to be managed is monitored in real time, and an early warning is issued when water shortage is found in the vegetation to be managed; When the total competition intensity score is a second preset score, the available water source ratio is less than the preset first available water source ratio threshold, and the available water source ratio is greater than the preset second available water source ratio threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized; wherein the preset first available water source ratio threshold is greater than the preset second available water source ratio threshold; When the total competition intensity score is the second preset score and the proportion of available water sources is not greater than the preset second available water source proportion threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed; When the total competition intensity score is not less than the third preset score, and the proportion of available water sources is not less than the preset first available water source proportion threshold, the competition intensity level is determined to be moderate competition, and the irrigation methods of all vegetation to be managed are optimized; When the total competition intensity score is not less than the third preset score, the available water source ratio is less than the preset first available water source ratio threshold, and the available water source ratio is greater than the preset second available water source ratio threshold, the competition intensity level is determined to be high competition, and water is replenished for all vegetation to be managed; When the total competition intensity score is not less than the third preset score and the proportion of available water sources is not greater than the preset second available water source proportion threshold, the competition intensity level is determined to be extreme competition, and a preset number of vegetation to be managed are removed from all vegetation to be managed; wherein the first preset score, the second preset score and the third preset score are different in size.

7. A vegetation management device based on dynamic threshold, characterized in that: include: Data acquisition module, potential water source water storage calculation module, total water source demand calculation module, water source utilization ratio dynamic threshold calculation module, actual utilization ratio acquisition module and vegetation management module; The data acquisition module is used to obtain the soil moisture content and the area of ​​vegetation to be managed corresponding to each soil layer according to a number of preset soil layer depths, and simultaneously obtain the current groundwater level fluctuation and the current precipitation; The potential water source water reserve calculation module is used to calculate the potential water source water reserve based on the preset soil layer depth, soil layer moisture content, vegetation area to be managed, water level fluctuation and precipitation; The total water demand calculation module is used to obtain the current soil heat flux, average daily temperature, wind speed, daily saturated water vapor pressure, actual water vapor pressure, net radiation of the vegetation surface to be managed, and the managed vegetation area to be managed, and calculate the current total water demand of the vegetation to be managed; The water source utilization ratio dynamic threshold calculation module is used to calculate the available water source ratio of the vegetation to be managed based on the water storage of the potential water source and the current total water source demand, and calculate the water source utilization ratio dynamic threshold of the vegetation to be managed based on the available water source ratio and the water source quantity of the potential water source; The actual utilization ratio acquisition module is used to obtain the actual utilization ratio of each potential water source to each vegetation to be managed; The vegetation management module is used to compare the dynamic threshold of water source utilization ratio with the actual utilization ratio of each potential water source by each vegetation to be managed, and manage each vegetation to be managed according to the comparison result.

8. The vegetation management device based on dynamic threshold according to claim 7, characterized in that: The potential water source water reserve calculation module includes: Soil water storage calculation unit, groundwater exploitable volume calculation unit and water volume calculation unit; The soil water storage capacity calculation unit is used to calculate the soil water storage capacity according to the preset soil layer depth, soil layer water content and the area of ​​vegetation to be managed; The groundwater exploitable quantity calculation unit is used to calculate the groundwater exploitable quantity according to the water level fluctuation and the area of ​​vegetation to be managed; The water quantity calculation unit is used to obtain the potential water source water reserve based on the sum of the soil water storage capacity, the exploitable groundwater capacity and the precipitation.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a vegetation management method based on a dynamic threshold as described in any one of claims 1 to 6 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the vegetation management method based on dynamic thresholds according to any one of claims 1 to 6.

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