Method, system, equipment and medium for evaluating nitrogen convergence potential of watershed wetland

Abstract

The invention discloses a method, a system, equipment and a medium for evaluating the nitrogen convergence potential of watershed wetlands, and the method comprises the steps: firstly obtaining natural geographic data, agricultural production activity data and wetland distribution data of a watershed, and then determining the nitrogen input of each wetland in the watershed based on the natural geographic data and the agricultural production activity data; determining the nitrogen reduction rate of each wetland in the drainage basin based on the natural geographic data and the wetland distribution data, and finally determining the wetland nitrogen convergence potential in the drainage basin based on the wetland nitrogen input and the nitrogen reduction rate of the wetland. According to the method, the nitrogen reduction capability of the wetland in the drainage basin is systematically evaluated, and the nitrogen convergence potential of the wetland is determined.

Description

Technical Field

[0001] The present invention belongs to the technical field of ecological environment assessment, and specifically relates to a method, system, equipment and medium for assessing nitrogen sink potential in river basin wetlands. Background Art

[0002] Excessive anthropogenic nitrogen input has been widely recognized as one of the main causes of eutrophication of water bodies, especially in areas with intensive human activities. Wetland ecosystems, as an indispensable and important part of the watershed landscape, play a key role in water purification. Wetlands are not only important nitrogen sinks, but can also effectively reduce nitrogen concentrations in water bodies and prevent excessive nitrogen from entering downstream water bodies, thereby inhibiting the occurrence of eutrophication. Therefore, systematically evaluating the nitrogen sink potential of wetlands is of great practical significance for formulating scientific and targeted wetland protection and management measures and improving the nitrogen removal efficiency of wetlands. This process can effectively reduce the risk of nitrogen pollution and promote the health and sustainable development of the overall environment of the basin.

[0003] However, most of the existing studies on wetland nitrogen reduction and nitrogen sink have focused on the analysis of individual wetlands, lacking a systematic assessment of wetland nitrogen sink capacity at a regional scale. The lack of regional studies has led to limitations in the understanding of wetland nitrogen sink capacity, which in turn has hindered the proposal of effective wetland management strategies at the watershed scale. Therefore, it is necessary to establish a scientific and reasonable regional assessment method to conduct a systematic study of wetland nitrogen reduction and nitrogen sink capacity to make up for the shortcomings of existing research. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a method, system, equipment and medium for evaluating nitrogen sink potential in river basin wetlands.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention proposes a method for evaluating the nitrogen sink potential of a river basin wetland, comprising:

[0007] S1. Obtain the natural geographical data, agricultural production activity data and wetland distribution data of the watershed;

[0008] S2. Determine the nitrogen input of each wetland in the basin based on physical geographic data and agricultural production activity data; determine the nitrogen reduction rate of each wetland in the basin based on physical geographic data and wetland distribution data;

[0009] S3. Determine the nitrogen sink potential of wetlands in the basin based on the nitrogen input and nitrogen reduction rate of each wetland.

[0010] In S2, the nitrogen input of each wetland in the basin is calculated according to the following formula:

[0011] Nin，i =f×N sur ×A wetland，i ×8.2

[0012] In the above formula, N in，i is the nitrogen input to the ith wetland, f is the decay factor, N sur is the nitrogen surplus of the watershed, A wetland，i is the area of ​​the ith wetland;

[0013] The nitrogen reduction rate of each wetland in the basin is calculated according to the following formula:

[0014]

[0015] In the above formula, R i is the nitrogen reduction rate of the ith wetland, k i is the first-order kinetic decay constant of the ith wetland, t i is the hydraulic retention time of the ith wetland;

[0016] In S3, the wetland nitrogen sink potential Sink in the basin is calculated according to the following formula:

[0017]

[0018] In the above formula, N is the number of wetlands in the basin.

[0019] The N sur Calculated according to the following formula:

[0020]

[0021] N crop =N fer +N manure +N dep +N fix +N straw -N utake

[0022] In the above formula, A crop , A non-crop are the cultivated land area and non-cultivated land area in the basin, N crop is the nitrogen surplus of cultivated land, N dep is the atmospheric nitrogen deposition rate in the basin, A watershed is the basin area, N fer is the nitrogen fertilizer input intensity of cultivated land, N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area, N fix is the amount of biological nitrogen fixation per unit area, N straw is the amount of straw nitrogen returned to the field per unit area, N uptake is the amount of nitrogen absorbed by crops per unit area.

[0023] The k i Calculated according to the following formula:

[0024] ln(k i )=-1.07×ln(t i )-0.029×T i -1.08

[0025]

[0026] In the above formula, T i is the average annual temperature of the ith wetland.

[0027] In a second aspect, the present invention proposes a basin wetland nitrogen sink potential assessment system, comprising a data acquisition module, a nitrogen input determination module, a nitrogen reduction rate determination module, and a wetland nitrogen sink potential determination module;

[0028] The data acquisition module is used to acquire the natural geographical data of the watershed, agricultural production activity data and wetland distribution data;

[0029] The nitrogen input determination module is used to determine wetland nitrogen input based on physical geographic data and agricultural production activity data;

[0030] The nitrogen reduction rate determination module is used to determine the nitrogen reduction rate of wetlands based on physical geographical data and wetland distribution data;

[0031] The wetland nitrogen sink potential determination module is used to determine the wetland nitrogen sink potential in a watershed based on wetland nitrogen input and wetland nitrogen reduction rate.

[0032] The nitrogen input determination module calculates the nitrogen input of each wetland in the basin according to the following formula:

[0033] N in，i =f×N sur ×A wetland，i ×8.2

[0034] In the above formula, N in，i is the nitrogen input to the ith wetland, f is the decay factor, N sur is the nitrogen surplus of the watershed, A wetland，i is the area of ​​the ith wetland;

[0035] The nitrogen reduction rate determination module calculates the nitrogen reduction rate of each wetland in the basin according to the following formula:

[0036]

[0037] In the above formula, R i is the nitrogen reduction rate of the ith wetland, k iis the first-order kinetic decay constant of the ith wetland, t i is the hydraulic retention time of the ith wetland;

[0038] The wetland nitrogen sink potential determination module calculates the wetland nitrogen sink potential Sink in the basin according to the following formula:

[0039]

[0040] In the above formula, N is the number of wetlands in the basin.

[0041] The N sur Calculated according to the following formula:

[0042]

[0043] N crop =N fer +N manure +N dep +N fix +N straw -N uptake

[0044] In the above formula, A crop , A non-crop are the cultivated land area and non-cultivated land area in the basin, N crop is the nitrogen surplus of cultivated land, N dep is the atmospheric nitrogen deposition rate in the basin, A watershed is the basin area, N fer is the nitrogen fertilizer input intensity of cultivated land, N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area, N fix is the amount of biological nitrogen fixation per unit area, N straw is the amount of straw nitrogen returned to the field per unit area, N uptake is the amount of nitrogen absorbed by crops per unit area.

[0045] The k i Calculated according to the following formula:

[0046] ln(k i )=-1.07×ln(t i )-0.029×T i -1.08

[0047]

[0048] In the above formula, T i is the average annual temperature of the ith wetland.

[0049] In a third aspect, the present invention provides a device for evaluating nitrogen sink potential in a watershed wetland, including a memory and a processor;

[0050] The memory is used to store computer program code and transmit the computer program code to the processor;

[0051] The processor is configured to execute the aforementioned method according to the instructions in the computer program code.

[0052] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the aforementioned method when executed by a processor.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] This method for assessing the nitrogen sink potential of wetlands in a watershed first obtains the natural geographic data, agricultural production activity data and wetland distribution data of the watershed, then determines the nitrogen input of each wetland in the watershed based on the natural geographic data and agricultural production activity data, determines the nitrogen reduction rate of each wetland in the watershed based on the natural geographic data and wetland distribution data, and finally determines the nitrogen sink potential of wetlands in the watershed based on the wetland nitrogen input and the wetland nitrogen reduction rate. This method systematically evaluates the nitrogen reduction capacity of wetlands in the watershed and clarifies the nitrogen sink potential of wetlands. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a flowchart of the method described in Example 1.

[0056] Figure 2 This is a schematic diagram of nitrogen surplus in the Yangtze River Basin in 2015 in Example 1.

[0057] Figure 3 This is a schematic diagram of the nitrogen sink potential of different basins in the Yangtze River Basin in 2015 in Example 1.

[0058] Figure 4 This is a structural diagram of the system described in Example 2.

[0059] Figure 5 This is a structural diagram of the device described in Example 3. DETAILED DESCRIPTION

[0060] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0061] Embodiment 1:

[0062] This embodiment takes the Yangtze River Basin as an example to implement a method for evaluating nitrogen sink potential in a river basin wetland according to the present invention. Figure 1 As shown, the specific steps are as follows:

[0063] 1. Determine the scope and boundaries of the Yangtze River Basin.

[0064] The Yangtze River Basin has a variety of terrain, including mountains, plateaus, basins, hills and plains. It flows through the Qinghai-Tibet Plateau, Hengduan Mountains, Yunnan-Guizhou Plateau, Sichuan Basin, Jiangnan Hills and the middle and lower reaches of the Yangtze River Plain. Most areas of the Yangtze River Basin have a typical subtropical monsoon climate, but the Yangtze River Basin is vast, and the climate characteristics of different regions are significantly different, and there are also some plateau climates. The average temperature in the basin is about 13°C for many years, and the average annual precipitation is about 1067mm. According to the water system and terrain of the Yangtze River Basin, the Yangtze River Basin is divided into 45 small basins.

[0065] 2. Obtain the natural geographical data, agricultural production activity data and wetland distribution data of the Yangtze River Basin.

[0066] (1) Physical geographic data: The data include temperature data, cultivated land area, construction land area, forest and grassland area and atmospheric nitrogen deposition rate in the Yangtze River Basin in 2015; the temperature data are derived from the national temperature grid data of the Resources and Environmental Science and Data Center of the Chinese Academy of Sciences (https: / / www.resdc.cn / ), with a spatial resolution of 1 km; the cultivated land area, construction land area and forest and grassland area are derived from the National Statistical Yearbook of China and the statistical yearbooks of provinces and cities involved in the Yangtze River Basin; the atmospheric nitrogen deposition rate is derived from the atmospheric deposition per unit area monitored in different regions of the Yangtze River Basin in the literature.

[0067] (2) Agricultural production activity data: The data include fertilizer nitrogen input (including nitrogen fertilizer and compound fertilizer), crop yields, livestock and poultry breeding scale, straw return ratio and empirical parameter data in the Yangtze River Basin in 2015; the fertilizer nitrogen input, crop yields and livestock and poultry breeding scale are derived from the National Statistical Yearbook of China and the statistical yearbooks of provinces and cities involved in the Yangtze River Basin; the straw return ratio data are derived from the straw return rates in different regions reported in the literature; the empirical parameter data include the seed nitrogen content, straw nitrogen content, grass-to-grain ratio and biological nitrogen fixation rate of different crops, which are derived from the results reported in the literature.

[0068] (3) Wetland distribution data: The data include the wetland area, longitude and latitude of the Yangtze River Basin in 2015; the wetland distribution data are derived from China's multi-period land use remote sensing monitoring dataset.

[0069] 3. Determine nitrogen input to each wetland in the basin based on physical geographic data and agricultural production activity data:

[0070] N in，i =f×N sur ×A wetland，i ×8.2

[0071]

[0072] N crop=N fer +N manure +N dep +N fix +N straw -N uptake

[0073] In the above formula, N in，i is the nitrogen input to the ith wetland (kg), f is the attenuation factor (dimensionless), ranging from 0.3 to 0.5. The attenuation factor represents the potential proportion of nitrogen surplus in the basin entering the wetland. It is calculated based on the proportion of land use types in the basin (arable land, construction land, and forest and grassland) and the nitrogen loss coefficient of different land use types. The nitrogen loss coefficient of different land use types is reported in the literature. N sur is the nitrogen surplus in the watershed (kg / ha), A wetland，i is the area of ​​the ith wetland (ha), A crop , A non-crop are the cultivated land area (ha) and non-cultivated land area (ha) in the basin, respectively. crop is the nitrogen surplus of cultivated land (kg / ha), N dep is the atmospheric nitrogen deposition rate in the basin (kg / ha), A watershed is the basin area (ha), N fer is the nitrogen fertilizer input intensity of cultivated land (kg / ha), N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area (kg / ha), N fix is the biological nitrogen fixation per unit area (kg / ha), N straw is the amount of straw nitrogen returned to the field per unit area (kg / ha), N uptake is the nitrogen absorption of crops per unit area (kg / ha).

[0074] Among them, the nitrogen surplus in the Yangtze River Basin in 2015 was as follows: Figure 2 shown.

[0075] N fer The calculation formula is:

[0076] N fer =(Fer N +0.3×Fer com ) / A crop

[0077] In the above formula, Fer N is the input amount of nitrogen fertilizer (pure) (kg), Fer com is the input amount of compound fertilizer (pure) (kg);

[0078] N manure The calculation formula is:

[0079]

[0080] In the above formula, M i is the national standard amount of livestock and poultry manure returned to the field for large livestock, pigs, cattle and poultry (kg), θ i is the proportion of regional livestock and poultry farming scale to the national scale (dimensionless decimal);

[0081] N fix The crops are divided into leguminous plants, paddy fields and dry land during calculation. The calculation formula is:

[0082] N fix =(Crop leg ×0.6+A paddy ×f paddy +A upland ×f upland ) / A crop

[0083] In the above formula, Crop leg is the nitrogen content of leguminous plants (including seeds and straw, for calculation method, see crop absorption) (kg), A paddy , A upland are the paddy field and dry land area (ha), f paddy 、f upland are the nitrogen fixation coefficient per unit area of ​​paddy field and dry land (kg / ha);

[0084] N straw The calculation formula is:

[0085] N straw =(Straw×R str ) / A crop

[0086] In the above formula, Straw is the total amount of straw resources (kg), R str is the straw return rate (dimensionless decimal);

[0087] N uptake The calculation is based on the yield, seed nitrogen content, straw nitrogen content and grass-grain ratio of different crops. Crops are divided into wheat, corn, rice, other grains, fruits, oil crops, sugar crops, tuber crops, vegetables, legumes and other crops. The calculation formula is:

[0088]

[0089] In the above formula, Yield i is the yield of the i-th crop (kg), c seed，i is the nitrogen content of the i-th crop seed (dimensionless decimal), c str，iis the nitrogen content of the i-th crop straw (dimensionless decimal), μ i is the grass-to-grain ratio of the ith crop (dimensionless decimal).

[0090] 4. Determine the nitrogen reduction rate of each wetland in the basin based on physical geographic data and wetland distribution data:

[0091]

[0092] ln(k i )=-1.07×ln(t i )-0.029×T i -1.08

[0093]

[0094] In the above formula, R i is the nitrogen reduction rate of the ith wetland (%), k i is the first-order kinetic decay constant of the ith wetland (d -1 ), t i is the hydraulic retention time (d) of the ith wetland, T i is the average annual temperature of the ith wetland (℃), A wetand，i is the area of ​​the ith wetland (ha).

[0095] 5. Determine the nitrogen sink potential of wetlands in the basin based on nitrogen input and nitrogen reduction rate of each wetland:

[0096]

[0097] In the above formula, Sink is the nitrogen sink potential of wetlands in the basin (kg), and N is the number of wetlands in the basin (units).

[0098] This example calculates that the nitrogen sink potential of the Yangtze River Basin wetlands in 2015 is 256,000 tons. The nitrogen sink potential of the wetlands in 45 small watersheds in the Yangtze River Basin is as follows: Figure 3 shown.

[0099] Embodiment 2:

[0100] Basin wetland nitrogen sink potential assessment system, such as Figure 4 As shown, it includes a data acquisition module, a nitrogen input determination module, a nitrogen reduction rate determination module, and a wetland nitrogen sink potential determination module.

[0101] The data acquisition module is used to acquire the natural geographical data, agricultural production activity data and wetland distribution data of the watershed, wherein the natural geographical data include the temperature data, cultivated land area, construction land area, forest and grassland area and atmospheric nitrogen deposition rate of the watershed; the agricultural production activity data include the fertilizer nitrogen input (including nitrogen fertilizer and compound fertilizer), different crop yields, livestock and poultry breeding scale, straw return ratio and empirical parameter data of the watershed; the wetland distribution data include the wetland area, longitude and latitude of the watershed.

[0102] The nitrogen input determination module is used to determine wetland nitrogen input based on natural geographical data and agricultural production activity data:

[0103] N in，i =f×N sur ×A wetland，i ×8.2

[0104]

[0105] N crop =N fer +N manure +N dep +N fix +N straw -N uptake

[0106] In the above formula, N in，i is the nitrogen input to the ith wetland, f is the attenuation factor, ranging from 0.3 to 0.5. The attenuation factor represents the potential proportion of nitrogen surplus in the basin entering the wetland. It is calculated based on the proportion of land use types in the basin (arable land, construction land, and forest and grassland) and the nitrogen loss coefficient of different land use types. The nitrogen loss coefficient of different land use types is reported in the literature. N sur is the nitrogen surplus of the watershed, A wetland，i is the area of ​​the ith wetland, A crop , A non-crop are the cultivated land area and non-cultivated land area in the basin, N crop is the nitrogen surplus of cultivated land, N dep is the atmospheric nitrogen deposition rate in the basin, A watershed is the basin area, N fer is the nitrogen fertilizer input intensity of cultivated land, N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area, N fix is the amount of biological nitrogen fixation per unit area, N straw is the amount of straw nitrogen returned to the field per unit area, N uptake is the amount of nitrogen absorbed by crops per unit area.

[0107] N fer The calculation formula is:

[0108] N fer =(Fer N +0.3×Fer com ) / A crop

[0109] In the above formula, Fer N is the input amount of nitrogen fertilizer (pure) (kg), Fer com is the input amount of compound fertilizer (pure) (kg);

[0110] N manure The calculation formula is:

[0111]

[0112] In the above formula, M i is the national standard amount of livestock and poultry manure returned to the field for large livestock, pigs, cattle and poultry (kg), θ i is the proportion of regional livestock and poultry farming scale to the national scale (dimensionless decimal);

[0113] N fix The crops are divided into leguminous plants, paddy fields and dry land during calculation. The calculation formula is:

[0114] N fix =(Crop leg ×0.6+A paddy ×f paddy +A upland ×f upland ) / A crop

[0115] In the above formula, Crop leg is the nitrogen content of leguminous plants (including seeds and straw, for calculation method, see crop absorption) (kg), A paddy , A upland are the paddy field and dry land area (ha), f paddy 、f upland are the nitrogen fixation coefficient per unit area of ​​paddy field and dry land (kg / ha);

[0116] N straw The calculation formula is:

[0117] N straw =(Straw×R str ) / A crop

[0118] In the above formula, Straw is the total amount of straw resources (kg), R str is the straw return rate (dimensionless decimal);

[0119] N uptakeThe calculation is based on the yield, seed nitrogen content, straw nitrogen content and grass-grain ratio of different crops. Crops are divided into wheat, corn, rice, other grains, fruits, oil crops, sugar crops, tuber crops, vegetables, legumes and other crops. The calculation formula is:

[0120]

[0121] In the above formula, Yield i is the yield of the i-th crop (kg), c seed，i is the nitrogen content of the i-th crop seed (dimensionless decimal), c str，i is the nitrogen content of the i-th crop straw (dimensionless decimal), μ i is the grass-to-grain ratio of the ith crop (dimensionless decimal).

[0122] The nitrogen reduction rate determination module is used to determine the nitrogen reduction rate of wetlands based on natural geographical data and wetland distribution data:

[0123]

[0124] ln(k i )=-1.07×ln(t i )-0.029×T i -1.08

[0125]

[0126] In the above formula, R i is the nitrogen reduction rate of the ith wetland, k i is the first-order kinetic decay constant of the ith wetland, t i is the hydraulic retention time of the ith wetland, T i is the average annual temperature of the ith wetland.

[0127] The wetland nitrogen sink potential determination module is used to determine the wetland nitrogen sink potential Sink in the basin based on the wetland nitrogen input and the wetland nitrogen reduction rate:

[0128]

[0129] In the above formula, N is the number of wetlands in the basin.

[0130] Embodiment 3:

[0131] Equipment for assessing nitrogen sink potential of wetlands in watersheds, such as Figure 5 As shown, it includes a memory and a processor.

[0132] The memory is used to store computer program codes and transmit the computer program codes to the processor.

[0133] The processor is configured to execute the method as described in Embodiment 1 according to the instructions in the computer program code.

[0134] Embodiment 4:

[0135] A computer-readable storage medium stores a computer program, which implements the method described in Example 1 when executed by a processor.

Claims

1. A method for assessing nitrogen sink potential in river basin wetlands, characterized in that: The method comprises: S1. Obtain the natural geographical data, agricultural production activity data and wetland distribution data of the watershed; S2. Determine the nitrogen input of each wetland in the basin based on physical geographic data and agricultural production activity data; determine the nitrogen reduction rate of each wetland in the basin based on physical geographic data and wetland distribution data; S3. Determine the nitrogen sink potential of wetlands in the basin based on the nitrogen input and nitrogen reduction rate of each wetland.

2. The method for assessing nitrogen sink potential of river basin wetlands according to claim 1, characterized in that: In S2, the nitrogen input of each wetland in the basin is calculated according to the following formula: N in，i =f×N sur ×A wetland，i ×8.2 In the above formula, N in，i is the nitrogen input to the ith wetland, f is the decay factor, N sur is the nitrogen surplus of the watershed, A wetland，i is the area of ​​the ith wetland; The nitrogen reduction rate of each wetland in the basin is calculated according to the following formula: In the above formula, R i is the nitrogen reduction rate of the ith wetland, k i is the first-order kinetic decay constant of the ith wetland, t i is the hydraulic retention time of the ith wetland; In S3, the wetland nitrogen sink potential Sink in the basin is calculated according to the following formula: In the above formula, N is the number of wetlands in the basin.

3. The method for assessing nitrogen sink potential of river basin wetlands according to claim 2, characterized in that: The N sur Calculated according to the following formula: N crop =N fer +N manure +N dep +N fix +N straw -N uptake In the above formula, A crop , A non-crop are the cultivated land area and non-cultivated land area in the basin, N crop is the nitrogen surplus of cultivated land, N dep is the atmospheric nitrogen deposition rate in the basin, A watershed is the basin area, N fer is the nitrogen fertilizer input intensity of cultivated land, N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area, N fix is the amount of biological nitrogen fixation per unit area, N straw is the amount of straw nitrogen returned to the field per unit area, N uptake is the amount of nitrogen absorbed by crops per unit area.

4. The method for assessing nitrogen sink potential of river basin wetlands according to claim 2, characterized in that: The k i Calculated according to the following formula: ln(k i )=-1.07×ln(t i )-0.029×T i -1.08 In the above formula, T i is the average annual temperature of the ith wetland.

5. The basin wetland nitrogen sink potential assessment system is characterized by: The system includes a data acquisition module, a nitrogen input determination module, a nitrogen reduction rate determination module, and a wetland nitrogen sink potential determination module; The data acquisition module is used to acquire the natural geographical data of the watershed, agricultural production activity data and wetland distribution data; The nitrogen input determination module is used to determine wetland nitrogen input based on physical geographic data and agricultural production activity data; The nitrogen reduction rate determination module is used to determine the nitrogen reduction rate of wetlands based on physical geographical data and wetland distribution data; The wetland nitrogen sink potential determination module is used to determine the wetland nitrogen sink potential in a watershed based on wetland nitrogen input and wetland nitrogen reduction rate.

6. The basin wetland nitrogen sink potential assessment system according to claim 5, characterized in that: The nitrogen input determination module calculates the nitrogen input of each wetland in the basin according to the following formula: N in，i =f×N sur ×A wetland，i ×8.2 In the above formula, N in，i is the nitrogen input to the ith wetland, f is the decay factor, N sur is the nitrogen surplus of the watershed, A wetland，i is the area of ​​the ith wetland; The nitrogen reduction rate determination module calculates the nitrogen reduction rate of each wetland in the basin according to the following formula: In the above formula, R i is the nitrogen reduction rate of the ith wetland, k i is the first-order kinetic decay constant of the ith wetland, t i is the hydraulic retention time of the ith wetland; The wetland nitrogen sink potential determination module calculates the wetland nitrogen sink potential Sink in the basin according to the following formula: In the above formula, N is the number of wetlands in the basin.

7. The basin wetland nitrogen sink potential assessment system according to claim 5, characterized in that: The N sur Calculated according to the following formula: N crop =N fer +N manure +N dep +N fix +N straw -N uptake In the above formula, A crop , A non-crop are the cultivated land area and non-cultivated land area in the basin, N crop is the nitrogen surplus of cultivated land, N dep is the atmospheric nitrogen deposition rate in the basin, A watershed is the basin area, N fer is the nitrogen fertilizer input intensity of cultivated land, N manure is the amount of nitrogen returned to the field from livestock and poultry manure per unit area, N fix is the amount of biological nitrogen fixation per unit area, N straw is the amount of straw nitrogen returned to the field per unit area, N uptake is the amount of nitrogen absorbed by crops per unit area.

8. The basin wetland nitrogen sink potential assessment system according to claim 5, characterized in that: The k i Calculated according to the following formula: ln(k i )=-1.07×ln(t i )-0.029×T i -1.08 In the above formula, T i is the average annual temperature of the ith wetland.

9. Basin wetland nitrogen sink potential assessment equipment, characterized by: The device comprises a memory and a processor; The memory is used to store computer program code and transmit the computer program code to the processor; The processor is configured to execute the method according to any one of claims 1 to 4 according to the instructions in the computer program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

Images