CN116485574B - River basin planting structure determining method, system and equipment based on target water quality requirement - Google Patents

River basin planting structure determining method, system and equipment based on target water quality requirement Download PDF

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CN116485574B
CN116485574B CN202310445549.0A CN202310445549A CN116485574B CN 116485574 B CN116485574 B CN 116485574B CN 202310445549 A CN202310445549 A CN 202310445549A CN 116485574 B CN116485574 B CN 116485574B
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river basin
nitrogen
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target river
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CN116485574A (en
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李文超
杨紫薇
尹高飞
马文奇
习斌
刘宏斌
赵海璇
王佳宝
杨见进
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Heibei Agricultural University
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Abstract

The invention discloses a method, a system and equipment for determining a river basin planting structure based on target water quality requirements, and relates to the technical field of river basin planting structure determination, wherein the method comprises the following steps: determining the nitrogen load allowed to enter a target water body by the target river basin planting industry and the current nitrogen load of the planting industry in each region of the target river basin; determining the maximum nitrogen load allowed by the planting industry in each area of the target river basin according to the nitrogen load allowed by the planting industry of the target river basin to enter the target water body; comparing the current nitrogen loading of either zone to a corresponding maximum nitrogen loading; when the current nitrogen load is smaller than the maximum nitrogen load, the planting area of crops with higher yield and lower nitrogen load in the area is adjusted, otherwise, the space configuration adjustment is carried out on the crop planting structure. The invention can meet the requirement of target yield and the requirement of target water quality.

Description

River basin planting structure determining method, system and equipment based on target water quality requirement
Technical Field
The invention relates to the technical field of river basin planting structure determination, in particular to a river basin planting structure determination method, system and equipment based on target water quality requirements.
Background
The water environment pollution problem is a great environmental problem to be solved urgently at present. The planting industry is an important source of water environment pollution, and the reduction of the planting industry pollution is one of the main problems facing the current ecological environment field. Therefore, determining reasonable planting structures and planting scales is an effective method for preventing and controlling pollution of the planting industry. Currently, a method for determining a planting structure from the viewpoint of reducing non-point source pollution exists, but a method for determining an optimal planting structure for river basin agriculture, which meets both a water quality target requirement and a yield target requirement, is not available at present.
Disclosure of Invention
The invention aims to provide a river basin planting structure determining method, system and equipment based on target water quality requirements, which can meet the requirements of target yield and target water quality.
In order to achieve the above object, the present invention provides the following solutions:
in a first aspect, the present invention provides a method for determining a river basin planting structure based on a target water quality requirement, comprising:
determining the nitrogen load of the target river basin planting industry allowed to enter the target water body according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin living source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network;
determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting areas of various crops in the target river basin and the nitrogen loss coefficients of various crops in the target river basin;
according to the nitrogen load allowed to enter a target water body by the target river basin planting industry and the total planting area of the target river basin, determining the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, and determining the maximum nitrogen load allowed by the planting industry of each region of the target river basin according to the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin;
comparing the current nitrogen load of the planting industry in each area of the target river basin with the maximum allowable nitrogen load of the corresponding planting industry;
when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry, adjusting the planting area of crops with higher yield and lower nitrogen load in any area until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry;
when the current nitrogen load of the planting industry in any area of the target river basin is larger than the maximum nitrogen load allowed by the corresponding planting industry, the space configuration adjustment is carried out on the crop planting structure based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
Optionally, determining the nitrogen load allowed to enter the target water body by the target river basin planting industry according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin life source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network, specifically comprising:
according to the target water quality requirement of the target water body, adopting a formula A t ＝S×C t ×365×10 -9 Determining the nitrogen load of a target river basin allowed to enter a target water body; wherein A is t The nitrogen load allowed to enter the target water body for the target river basin is S, the target water body area is C t To meet the threshold value of nitrogen load under the requirement of target water quality of the target water body;
according to the current load of the stock raising in the target river basin, adopting a formula A q ＝B q ×C q ×365×10 -6 X (1-R) calculating nitrogen load of the target river basin animal husbandry entering the target water body; wherein A is q For nitrogen load of target water body entering target river basin animal husbandry, B q The number of the livestock and poultry breeding of the q-th type of the target river basin is C q The nitrogen pollution discharge coefficient of the livestock and poultry in the q-th class of the target river basin is shown, and R is the nitrogen attenuation coefficient of the river network of the target river basin;
according to the current load of living sources of the target river basin, A is adopted f ＝B f ×C f ×10 -6 X (1-R) calculating nitrogen load of a living source of a target river basin entering a target water body; wherein A is f B, nitrogen load of target basin living source entering target water body f For the current situation of the target river basinPopulation number, C f Nitrogen emission coefficient for the target basin life source;
according to the current load of the point source of the target river basin, A is adopted k ＝B k ×C k ×10 -9 X (1-R) calculating nitrogen load of a target watershed point source entering a target water body; wherein A is k B, nitrogen load of target watershed point source entering target water body k C, the point source sewage discharge amount of the target river basin is C k The concentration of nitrogen in the sewage is discharged for a target river basin point source;
according to formula A L ＝A t -A q -A f -A k Determining the nitrogen load allowed to enter a target water body by the target river basin planting industry; wherein A is L The planting industry allows nitrogen loading into a target body of water for a target river basin.
Optionally, determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting areas of various crops in the target river basin and the nitrogen loss coefficients of various crops in the target river basin specifically comprises:
dividing the target river basin according to the distance between each county and city of the target river basin and the target water body; the region comprises a target water body downstream region, a target water body middle upstream region and a target water body upstream region;
according to formula T i ＝F ij ×G ij ×e i ×10 -3 Determining the current nitrogen load of the planting industry in each area of the target river basin; wherein T is i For the current nitrogen load of the planting industry in the ith area of the target river basin, F ij G is the planting area of the jth crop in the ith area of the target river basin ij Nitrogen application amount, e, for j-th crop in i-th area of target river basin i Is the nitrogen loss coefficient of the i-th region of the target river basin.
Optionally, determining the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R according to the nitrogen load allowed by the target river basin planting industry to enter the target water body and the total planting area of the target river basin specifically comprises:
according to the formula p=a L Target river basin planting industry permission when determining target river basin river network attenuation coefficient as RIs a load intensity of (2); wherein P is the load intensity allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R, A L And allowing nitrogen load entering a target water body for the target river basin planting industry, wherein F is the total planting area of the target river basin.
Optionally, determining the maximum nitrogen load allowed by the planting industry of each region of the target river basin according to the load intensity allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin, wherein the method specifically comprises the following steps:
according to formula P i ＝P/(1-R i )×F i ×10 -3 Determining the maximum nitrogen load allowed by the planting industry in each area of the target river basin; wherein P is i For the maximum nitrogen load allowed by the planting industry of the ith area of the target river basin, P is the load intensity allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R, and R is the maximum nitrogen load allowed by the planting industry of the ith area of the target river basin i Attenuation coefficient F of nitrogen entering target water body for ith region of target river basin i Is the planting area of the ith area of the target river basin.
Optionally, based on the requirement that the target yield of each crop in the target river basin is not reduced, performing space configuration adjustment on the crop planting structure until the current nitrogen load of the planting industry in any region of the target river basin is less than or equal to the maximum allowed nitrogen load of the corresponding planting industry, and specifically including:
and adjusting the planting proportion of crops with high nitrogen emission and low nitrogen emission among the areas and among the areas based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
In a second aspect, the present invention provides a system for determining a river basin planting structure based on target water quality requirements, comprising:
the nitrogen load determining module is used for determining the nitrogen load allowed to enter the target water body by the target river basin planting industry according to the target water quality requirement of the target water body, the current load of the target river basin animal husbandry, the current load of the target river basin living source, the current load of the target river basin point source and the nitrogen attenuation coefficient of the target river basin river network;
the current nitrogen load determining module is used for determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting areas of various crops in the target river basin and the nitrogen loss coefficients of various crops in the target river basin;
the maximum nitrogen load determination module is used for determining the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R according to the nitrogen load allowed by the target river basin planting industry to enter the target water body and the total planting area of the target river basin, and determining the maximum nitrogen load allowed by the target river basin planting industry according to the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin;
the comparison module is used for comparing the current nitrogen load of the planting industry in each area of the target river basin with the maximum allowable nitrogen load of the corresponding planting industry;
the first adjusting module is used for adjusting the planting area of crops with higher yield and lower nitrogen load in any area when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry;
and the second adjusting module is used for carrying out space configuration adjustment on the crop planting structure based on the requirement that the target yield of each crop in the target flow field is not reduced when the current nitrogen load of the planting industry in any region of the target flow field is larger than the corresponding maximum nitrogen load allowed by the planting industry, until the current nitrogen load of the planting industry in any region of the target flow field is smaller than or equal to the corresponding maximum nitrogen load allowed by the planting industry.
In a third aspect, the present invention provides an electronic device, comprising a memory for storing a computer program and a processor for running the computer program to cause the electronic device to perform the basin planting structure determination method based on target water quality requirements according to the first aspect.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the method, the allowable nitrogen load of the river basin is determined according to the requirement of the target water quality, and the nitrogen load of the river basin is reduced by optimizing and adjusting the planting structure on the basis of meeting the requirement of the target yield, so that the target water body meets the requirement of the target water quality, and a scientific guiding method is provided for agricultural non-point source pollution treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining a river basin planting structure based on target water quality requirements according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a river basin planting structure determining system based on target water quality requirements according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the embodiment of the invention provides a method for determining a river basin planting structure based on target water quality requirements, which comprises the following steps:
step 100: and determining the nitrogen load of the target river basin planting industry allowed to enter the target water body according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin living source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network.
Step 200: and determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting areas of the various crops in the target river basin and the nitrogen loss coefficients of the various crops in the target river basin.
Step 300: according to the nitrogen load allowed by the target river basin planting industry to enter the target water body and the total planting area of the target river basin, determining the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, and determining the maximum nitrogen load allowed by the planting industry of each region of the target river basin according to the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin.
Step 400: the current nitrogen load of the plant industry in each area of the target river basin is compared with the maximum allowable nitrogen load of the corresponding plant industry.
Step 500: and when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry, adjusting the planting area of crops with higher yield and lower nitrogen load in any area until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry.
Step 600: when the current nitrogen load of the planting industry in any area of the target river basin is larger than the maximum nitrogen load allowed by the corresponding planting industry, the space configuration adjustment is carried out on the crop planting structure based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
The method specifically comprises the steps of performing space configuration adjustment on a crop planting structure based on the requirement that the target yield of each crop in a target river basin is not reduced until the current nitrogen load of the planting industry in any region of the target river basin is smaller than or equal to the maximum allowed nitrogen load of the corresponding planting industry, wherein the method specifically comprises the following steps:
and adjusting the planting proportion of crops with high nitrogen emission and low nitrogen emission among the areas and among the areas based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
Further, the method provided by the embodiment of the invention further comprises the following steps: when the current nitrogen load of the planting industry in any area of the target river basin is equal to the maximum nitrogen load allowed by the corresponding planting industry, the planting structure of any area is kept unchanged.
In the embodiment of the present invention, step 100 specifically includes:
(1) According to the target water quality requirement of the target water body, adopting a formula A t ＝S×C t ×365×10 -9 Determining the nitrogen load of a target river basin allowed to enter a target water body; wherein A is t The nitrogen load (unit is t) allowed to enter the target water body for the target river basin, and S is the target water body area (unit is m 2 )，C t To meet the threshold value (unit is mg.m) of nitrogen load under the target water quality of the target water body -2 ·d -1 )。
(2) According to the current load of the stock raising in the target river basin, according to the formula A q ＝B q ×C q ×365×10 -6 X (1-R) calculating nitrogen load of the target river basin animal husbandry entering the target water body; wherein A is q Nitrogen load (unit is t) of target water body for target watershed animal husbandry, B q The number (head unit) of livestock and poultry raising in the q type of the target river basin, C q The nitrogen pollution discharge coefficient (unit is kg head) of the livestock and poultry in the q-th class of the target river basin -1 ·d -1 ) R is the nitrogen attenuation coefficient (dimensionless) of the river network of the target river basin.
(3) According to the current load of living sources of the target river basin, A is adopted f ＝B f ×C f ×10 -6 X (1-R) calculating nitrogen load of a living source of a target river basin entering a target water body; wherein A is f The nitrogen load (unit is t) of the living source entering the target water body in the target river basin, B f For the current population number of the target river basin, C f The nitrogen emission coefficient (unit is L.man.d) -1 ) R is the nitrogen attenuation coefficient (dimensionless) of the river network of the target river basin.
(4) According to the current load of the point source of the target river basin, A is adopted k ＝B k ×C k ×10 -9 X (1-R) calculating nitrogen load of a target watershed point source entering a target water body; wherein A is k Nitrogen load (unit is t) of target river basin point source entering target water body, B k C, the point source sewage discharge amount of the target river basin is C k And (3) discharging the concentration (unit is mg/L) of nitrogen in the sewage for the point source of the target river basin, wherein R is the nitrogen attenuation coefficient (dimensionless) of the river network of the target river basin.
(5) According to formula A L ＝A t -A q -A f -A k Determining the nitrogen load allowed to enter a target water body by the target river basin planting industry; wherein A is L The target river basin planting industry is allowed to enter the nitrogen load (in t) of the target water body.
In an embodiment of the present invention, step 200 specifically includes
(1) And dividing the target river basin area based on the distance of the target water body. The target river basin may be divided into a plurality of regions according to the distance from each county and city of the target river basin to the target water body. Such as from near to far from the target water body, into a downstream of the target water body, a midstream of the target water body and an upstream of the target water body.
According to formula T i ＝F ij ×G ij ×e i ×10 -3 Determining the current nitrogen load of the planting industry in each area of the target river basin; wherein T is i The current nitrogen load (unit is T.a) of the plant industry for the ith area of the target river basin -1 )，F ij Is the planting area (in hm 2 )，G ij Nitrogen application amount (unit kg.hm) for j-th crop in i-th area of target river basin -2 )，e i Nitrogen loss coefficient (in%) for the i-th region of the target basin.
In the embodiment of the present invention, step 300 specifically includes:
(1) According to the formula p=a L F, determining the allowable load intensity of the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R; wherein P is the load intensity (in kg/hm) allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R -2 ) F is the total planting area (in hm 2 )。
(2) According to formula P i ＝P/(1-R i )×F i ×10 -3 Determining the maximum nitrogen load allowed by the planting industry in each area of the target river basin; wherein P is i Maximum nitrogen load (unit is t) allowed by planting industry for ith area of target river basin, R i Attenuation coefficient F of nitrogen entering target water body for ith region of target river basin i Planting area for the ith area of the target river basin (in hm 2 )。
Example two
In order to execute the corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a drainage basin planting structure determining system based on the target water quality requirement is provided below.
As shown in fig. 2, an embodiment of the present invention provides a drainage basin planting structure determining system based on a target water quality requirement, including:
the nitrogen load determining module 1 for the target river basin planting industry to allow the target water body is used for determining the nitrogen load of the target river basin planting industry to allow the target water body according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin living source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network.
The current nitrogen load determining module 2 is used for determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting areas of various crops in the target river basin and the nitrogen loss coefficients of various crops in the target river basin.
The maximum nitrogen load determination module 3 is used for determining the load intensity allowed by the target river basin planting industry when the target river basin river network attenuation coefficient is R according to the nitrogen load allowed by the target river basin planting industry to enter the target water body and the total planting area of the target river basin, and determining the maximum nitrogen load allowed by the target river basin planting industry according to the load intensity allowed by the target river basin planting industry when the target river basin river network attenuation coefficient is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin.
And the comparison module 4 is used for comparing the current nitrogen load of the planting industry in each area of the target river basin with the maximum allowable nitrogen load of the corresponding planting industry.
And the first adjusting module 5 is used for adjusting the planting area of crops with higher yield and lower nitrogen load in any area when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry.
And the second adjusting module 6 is configured to perform spatial configuration adjustment on the crop planting structure based on the requirement that the target yield of each crop in the target river basin is not reduced when the current nitrogen load of the planting industry in any region of the target river basin is greater than the corresponding maximum nitrogen load allowed by the planting industry, until the current nitrogen load of the planting industry in any region of the target river basin is less than or equal to the corresponding maximum nitrogen load allowed by the planting industry.
Example III
The embodiment of the invention provides an electronic device which comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic device to execute the river basin planting structure determining method based on the target water quality requirement.
Alternatively, the electronic device may be a server.
The invention has the innovative advantages that:
(1) The invention can obtain the highest allowable load capacity of the area according to the requirement of the target water quality.
(2) The invention can realize the prevention and control of river basin agriculture non-point source pollution.
(3) The invention can meet the requirement of target yield and the pollution load of nitrogen can also meet the requirement of target water quality.
Therefore, the method for determining the allowable nitrogen load of the river basin through the requirement of the target water quality, and reducing the nitrogen load of the river basin by optimizing and adjusting the planting structure on the basis of meeting the requirement of the target yield, so that the target water body meets the requirement of the target water quality, and a scientific guiding method is provided for the agricultural non-point source pollution treatment.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (4)

1. The river basin planting structure determining method based on the target water quality requirement is characterized by comprising the following steps of:
determining the nitrogen load of the target river basin planting industry allowed to enter the target water body according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin life source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network, wherein the method specifically comprises the following steps:
according to the target water body target waterThe quality requirement is as shown in formula A t ＝S×C t ×365×10 -9 Determining the nitrogen load of a target river basin allowed to enter a target water body; wherein A is t The nitrogen load allowed to enter the target water body for the target river basin is S, the target water body area is C t To meet a threshold value of nitrogen load under a target water quality of a target water body;
according to the current load of the stock raising in the target river basin, according to the formula A q ＝B q ×C q ×365×10 -6 X (1-R) calculating nitrogen load of the target river basin animal husbandry entering the target water body; wherein A is q For nitrogen load of target water body entering target river basin animal husbandry, B q The number of the livestock and poultry breeding of the q-th type of the target river basin is C q The nitrogen pollution discharge coefficient of the livestock and poultry in the q-th class of the target river basin is shown, and R is the nitrogen attenuation coefficient of the river network of the target river basin;
according to the current load of living sources of the target river basin, A is adopted f ＝B f ×C f ×10 -6 X (1-R) calculating nitrogen load of a living source of a target river basin entering a target water body; wherein A is f B, nitrogen load of target basin living source entering target water body f For the current population number of the target river basin, C f The nitrogen emission coefficient is the nitrogen emission coefficient of the living source of the target river basin, and R is the nitrogen attenuation coefficient of the river network of the target river basin;
according to the current load of the point source of the target river basin, A is adopted k ＝B k ×C k ×10 -9 X (1-R) calculating nitrogen load of a target watershed point source entering a target water body; wherein A is k B, nitrogen load of target watershed point source entering target water body k C, the point source sewage discharge amount of the target river basin is C k The concentration of nitrogen in the sewage is discharged for a target river basin point source, and R is the nitrogen attenuation coefficient of the target river basin river network;
according to formula A L ＝A t -A q -A f -A k Determining the nitrogen load allowed to enter a target water body by the target river basin planting industry; wherein A is L Allowing nitrogen load into a target water body for the target watershed planting industry;
according to the planting areas of various crops in the target river basin and the nitrogen loss coefficients of the various crops in the target river basin, determining the current nitrogen load of the planting industry in various areas of the target river basin specifically comprises the following steps:
dividing a target river basin area based on the distance of a target water body; the target river basin can be divided into a plurality of areas according to the distance between each county and city of the target river basin and the target water body;
according to formula T i ＝F ij ×G ij ×e i ×10 -3 Determining the current nitrogen load of the planting industry in each area of the target river basin; wherein T is i For the current nitrogen load of the planting industry in the ith area of the target river basin, F ij G is the planting area of the jth crop in the ith area of the target river basin ij Nitrogen application amount, e, for j-th crop in i-th area of target river basin i A nitrogen loss coefficient for the i-th region of the target river basin;
according to the nitrogen load allowed by the target river basin planting industry to enter the target water body and the total planting area of the target river basin, determining the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, and according to the load intensity allowed by the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R, the nitrogen attenuation coefficient of the river network of each region of the target river basin and the planting area of each region of the target river basin, determining the maximum nitrogen load allowed by the planting industry of each region of the target river basin specifically comprises:
according to the formula p=a L F, determining the allowable load intensity of the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R; wherein P is the load intensity allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R, and F is the total planting area of the target river basin;
according to formula P i ＝P/(1-R i )×F i ×10 -3 Determining the maximum nitrogen load allowed by the planting industry in each area of the target river basin; wherein P is i Maximum nitrogen load allowed for the target watershed i-th area planting industry, R i Attenuation coefficient F of nitrogen entering target water body for ith region of target river basin i The planting area of the ith area of the target river basin;
comparing the current nitrogen load of the planting industry in each area of the target river basin with the maximum allowable nitrogen load of the corresponding planting industry;
when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry, adjusting the planting area of crops with higher yield and lower nitrogen load in any area until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry;
when the current nitrogen load of the planting industry in any area of the target river basin is larger than the maximum nitrogen load allowed by the corresponding planting industry, the space configuration adjustment is carried out on the crop planting structure based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
2. The method for determining a river basin planting structure based on target water quality requirements according to claim 1, wherein the spatial configuration adjustment is performed on the crop planting structure based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any region of the target river basin is less than or equal to the maximum nitrogen load allowed by the corresponding planting industry, specifically comprising:
and adjusting the planting proportion of crops with high nitrogen emission and low nitrogen emission among the areas and among the areas based on the requirement that the target yield of each crop in the target river basin is not reduced until the current nitrogen load of the planting industry in any area of the target river basin is smaller than or equal to the maximum nitrogen load allowed by the corresponding planting industry.
3. A watershed planting structure determination system based on target water quality requirements, comprising:
the nitrogen load determining module for determining the nitrogen load allowed to enter the target water body by the target river basin planting industry according to the target water body target water quality requirement, the target river basin animal husbandry current load, the target river basin life source current load, the target river basin point source current load and the nitrogen attenuation coefficient of the target river basin river network, specifically comprising:
according to the target water quality requirement of the target water body, adopting a formula A t ＝S×C t ×365×10 -9 Determining the nitrogen load of a target river basin allowed to enter a target water body; wherein A is t The nitrogen load allowed to enter the target water body for the target river basin is S, the target water body area is C t To meet a threshold value of nitrogen load under a target water quality of a target water body;
according to the current load of the stock raising in the target river basin, according to the formula A q ＝B q ×C q ×365×10 -6 X (1-R) calculating nitrogen load of the target river basin animal husbandry entering the target water body; wherein A is q For nitrogen load of target water body entering target river basin animal husbandry, B q The number of the livestock and poultry breeding of the q-th type of the target river basin is C q The nitrogen pollution discharge coefficient of the livestock and poultry in the q-th class of the target river basin is shown, and R is the nitrogen attenuation coefficient of the river network of the target river basin;
according to the current load of living sources of the target river basin, A is adopted f ＝B f ×C f ×10 -6 X (1-R) calculating nitrogen load of a living source of a target river basin entering a target water body; wherein A is f B, nitrogen load of target basin living source entering target water body f For the current population number of the target river basin, C f The nitrogen emission coefficient is the nitrogen emission coefficient of the living source of the target river basin, and R is the nitrogen attenuation coefficient of the river network of the target river basin;
according to the current load of the point source of the target river basin, A is adopted k ＝B k ×C k ×10 -9 X (1-R) calculating nitrogen load of a target watershed point source entering a target water body; wherein A is k B, nitrogen load of target watershed point source entering target water body k C, the point source sewage discharge amount of the target river basin is C k The concentration of nitrogen in the sewage is discharged for a target river basin point source, and R is the nitrogen attenuation coefficient of the target river basin river network;
according to formula A L ＝A t -A q -A f -A k Determining the nitrogen load allowed to enter a target water body by the target river basin planting industry; wherein A is L For the planting industry of the target river basinAllowing nitrogen loading into the target body of water;
the current nitrogen load determining module of the planting industry in each area of the target river basin is used for determining the current nitrogen load of the planting industry in each area of the target river basin according to the planting area of each crop in the target river basin and the nitrogen loss coefficient of each crop in the target river basin, and specifically comprises the following steps:
dividing a target river basin area based on the distance of a target water body; the target river basin can be divided into a plurality of areas according to the distance between each county and city of the target river basin and the target water body;
according to formula T i ＝F ij ×G ij ×e i ×10 -3 Determining the current nitrogen load of the planting industry in each area of the target river basin; wherein T is i For the current nitrogen load of the planting industry in the ith area of the target river basin, F ij G is the planting area of the jth crop in the ith area of the target river basin ij Nitrogen application amount, e, for j-th crop in i-th area of target river basin i A nitrogen loss coefficient for the i-th region of the target river basin;
the maximum nitrogen load determination module allowed by the planting industry of each area of the target river basin is used for determining the allowed load intensity of the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R according to the nitrogen load allowed by the planting industry of each area of the target river basin and the total planting area of the target river basin, and determining the maximum nitrogen load allowed by the planting industry of each area of the target river basin according to the allowed load intensity of the planting industry of the target river basin, the nitrogen attenuation coefficient of the river network of each area of the target river basin and the planting area of each area of the target river basin when the attenuation coefficient of the river network of the target river basin is R, and specifically comprises the following steps:
according to the formula p=a L F, determining the allowable load intensity of the target river basin planting industry when the attenuation coefficient of the river network of the target river basin is R; wherein P is the load intensity allowed by the planting industry of the target river basin when the attenuation coefficient of the river network of the target river basin is R, and F is the total planting area of the target river basin;
according to formula P i ＝P/(1-R i )×F i ×10 -3 Determining the maximum nitrogen load allowed by the planting industry in each area of the target river basin; wherein P is i Planting industry permission for the ith area of a target river basinMaximum nitrogen loading of R i Attenuation coefficient F of nitrogen entering target water body for ith region of target river basin i The planting area of the ith area of the target river basin;
the comparison module is used for comparing the current nitrogen load of the planting industry in each area of the target river basin with the maximum allowable nitrogen load of the corresponding planting industry;
the first adjusting module is used for adjusting the planting area of crops with higher yield and lower nitrogen load in any area when the current nitrogen load of the planting industry in any area of the target river basin is smaller than the maximum nitrogen load allowed by the corresponding planting industry until the current nitrogen load of the planting industry in any area of the target river basin is close to the maximum nitrogen load allowed by the corresponding planting industry;
and the second adjusting module is used for carrying out space configuration adjustment on the crop planting structure based on the requirement that the target yield of each crop in the target flow field is not reduced when the current nitrogen load of the planting industry in any region of the target flow field is larger than the corresponding maximum nitrogen load allowed by the planting industry, until the current nitrogen load of the planting industry in any region of the target flow field is smaller than or equal to the corresponding maximum nitrogen load allowed by the planting industry.
4. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the basin planting structure determination method based on target water quality requirements according to any one of claims 1 to 2.
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