1. A method for measuring and calculating a crop production water footprint based on a life cycle is characterized by comprising the following steps:

-data acquisition comprising:

acquiring production and consumption data of production data related to energy products in crop production;

acquiring production and consumption data of production data related to chemical industrial products in crop production;

acquiring water footprint data of production data related to agricultural products in crop production in a measuring and calculating area;

acquiring direct water consumption data in the field production process of the crops in the measuring and calculating area;

acquiring production data of the crop processing products in the measuring and calculating area;

-calculating an energy product consumption water footprint based on production and consumption data of production data related to the energy product;

-measuring and calculating the production water footprint of chemical industrial products and upstream products thereof put into the crop production process;

-measuring and calculating chemical industrial products and inter-provincial trade volume of upstream products thereof which are input in the crop production process;

-calculating the chemical industry product consumption water footprint according to the chemical industry product production water footprint, the provincial and international trade circulation data input in the crop production process;

-calculating the indirect water footprint of the crop production and its composition according to the water footprint and consumption data of different types of production data of energy products, chemical industry products and agricultural products put into the crop production process;

-calculating the crop production water footprint and its composition from the crop production indirect water footprint and the direct water footprint;

-measuring the water footprint of the crop processed product and determining the water footprint composition.

2. The life cycle based crop production water footprint calculation method of claim 1, wherein said obtaining production and consumption data of production data related to energy products in crop production comprises calculating a regional energy product production water footprint SWF [ E [ ]]Measuring and calculating regional energy product production Prod [ E ]]Provincial clean import amount I [ E ]]_peAnd international net import quantity I [ E ]]_ceInter-provincial and international traffic distance l, water consumption f_wAnd energy consumption f; the production and consumption data for obtaining production data related to chemical industry products in crop production comprises calculating fresh water consumption DWF [ I ] of chemical industry products input by regional crop production and upstream chemical industry products thereof]_bEnergy consumption of resources A [ P ]]L of wastewater discharge and V of pollutant discharge_pPollutant discharge standard C_maxNatural background concentration C_natRegional production, consumption and international import and export data for various industrial products and their upstream products; the water footprint data for obtaining production data related to agricultural products in crop production in the measuring and calculating area comprises a seed blue water footprint SWF [ A ]]_bGreen water footprint SWF [ A ]]_gnAnd gray water footprint SWF [ A ]]_grey(ii) a The method for acquiring the direct water consumption data in the field production process of the crops in the measuring and calculating area comprises the direct blue water footprint DWF [ C ] of the field production of the crops]_bDirect green water footprint DWF [ C ]]_gnAnd direct gray water footprint DWF [ C ]]_greyAnd field energy product consumption A [ E ]]Consumption of chemical and industrial products A [ I ]]And the consumption of agricultural products A [ A ]](ii) a The method for obtaining the production data of the crop processing products in the measuring and calculating area comprises the steps of measuring and calculating the direct water consumption PWR and the energy consumption AE of the crop processing products in the measuring and calculating area]Value coefficient f of processed product_vAnd product factor f_p。

3. The life cycle based crop production water footprint calculation method of claim 1, wherein said computational expression for calculating the energy product consumption water footprint is as follows:

in the above formula: SWF [ E ]]_cons，iConsumption water footprint of i energy-saving product, unit m³/t；SWF[E]_i，prod、SWF[E]_jAndrespectively i province, j province of export and production water footprint of foreign energy products, unit m³/t；Prod[E]_i、I[E]_j，peAnd I [ E ]]_ceThe yield of the i province energy product, the provincial net import amount and the international net import amount are respectively, and the unit t is; l_ijAndinter-provincial and international distances, unit km, are respectively indicated; f. of_wThe unit m of water consumed by transporting 1km of unit product during inter-provincial transportation³/km；SWF[E′]_jProducing water footprint for fuel of export province j in inter-provincial transportation, wherein the fuel is diesel oil or electric power and has unit m³T or m³/kWh; f is the energy consumption of 1km for provincial transportation of unit products, and the unit t/t.km of diesel oil or the unit kWh/t.km of electric power;refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t；The fuel consumption is 1km of fuel consumed by transporting a unit of product in international transportation, and the unit is t/t.km.

4. The life cycle based crop production water footprint calculation method of claim 1, wherein the calculation expression for calculating the production water footprint of chemical industrial products and upstream products thereof input in the crop production process is as follows:

in the above formula: SWF [ I ]]Production of water footprint for chemical industry product, unit m³/t；DWF[I]And IWF [ I]Respectively producing direct water footprints and indirect water footprints for chemical industry products in unit of m³/t；SWF_cons，i[P]The consumption water footprint of the i-th production data input product in the production process of chemical industrial products is unit m³/t；A_i[P]The consumption of the input product for the i-th production data in the production process of chemical industrial products is unit t/t;

according to different sources of water resources, the water footprints of chemical industry products are divided into blue water footprints and grey water footprints, the blue water footprints are surface water consumption and underground water consumption, and the grey water footprints are fresh water required by dilution water pollution; the expression for the grey water footprint is as follows:

in the above formula: SWF [ I ]]_greyUnit m for ash water footprint of chemical industry product³T; l is the discharge amount of wastewater in the production process of chemical industrial products, and the unit m is³/t；V_pThe unit mg/L is the pollutant discharge amount in the production process of chemical industrial products; c_maxIs the emission standard of pollutants, and the unit is mg/L; c_natIs the natural background concentration of the receiving water body, and the unit is mg/L.

5. The life cycle based crop production water footprint calculating method according to claim 1, wherein the calculation expression for calculating the inter-provincial trade volume of chemical industry products and upstream products thereof input in the crop production process is as follows:

in the above formula: t is_ijIs the trade volume of a certain product transported from province i to province j, unit t; c. C_ijThe distance from the transportation of a unit product from province i to province j, and the unit is km; f represents the total distance of transportation in km; s_iIs the product outflow amount of province i, unit t; d_jIs the product inflow in province j, unit t.

6. The life cycle based crop production water footprint calculation method of claim 1, wherein the calculation expression of the calculation of the water footprint consumed by the chemical industry product is as follows:

in the above formula: SWF [ I ]]_cons，iFor i province industrial product consumption water footprint, unit m³/t；SWF[I]_i，prod、SWF[I]_jAndrespectively i province, j province of export and production water footprint of foreign chemical industry products, unit m³/t；Prod[I]_i、I[I]_peAnd I [ I ]]_ceI yield of chemical industry products, provincial net import amount and international net import amount, unit t; SWF [ E ]]_cons，jThe water footprint of fuel consumption of the export province j in inter-provincial transportation is saved, the fuel is diesel oil, and the unit m is³/t；Refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t。

7. The life cycle based crop production water footprint calculating method as claimed in claim 1, wherein the calculation expression of indirect water footprint of the calculated crop production and the composition thereof is as follows:

IWF[C]＝IWF[C]_b+IWF[C]_gn+IWF[C]_grey

IWF[C]_gn＝SWF[A]_gn×A[A]

in the above expression: IWF [ C ]]Is an indirect water footprint in the crop production process, and has a unit of m³/t；IWF[C]_b、IWF[C]_gnAnd IWF [ C]_greyRespectively producing an indirect blue water footprint, an indirect green water footprint and an indirect grey water footprint for the crops in units of m³/t；SWF_cons，b，i[E]And SWF_{cons，grey，，i}[E]Respectively the consumption blue water footprint and the grey water footprint of the ith energy product input in the crop field production, and the unit m³/t；A_i[E]The consumption of the ith type energy product is unit t/t; SWF_cons，b，i[I]And SWF_{cons，grey，i}[I]Respectively the consumption blue water footprint and grey water footprint of the i-th industrial product input in the crop field production, and the unit m³/t；A_i[I]The consumption of the ith type industrial product is unit t/t; SWF [ A ]]_b、SWF[A]_gnAnd SWF [ A ]]_greyRespectively the blue water footprint, the green water footprint and the grey water footprint of seeds put into the crop field production, and the unit m³/t；A[A]The consumption of the seeds put into the field production of the crops is t/t.

8. The life cycle based crop production water footprint calculating method according to claim 1, wherein the calculation expression for calculating the crop production water footprint and the composition thereof is as follows:

SWF[C]＝SWF[C]_b+SWF[C]_grey+SWF[C]_gn

SWF[C]_b＝DWF[C]_b+IWF[C]_b

SWF[C]_gn＝DWF[C]_gn+IWF[C]_gn

SWF[C]_grey＝DWF[C]_grey+IWF[C]_grey

in the above expression: SWF [ C ]]Producing water footprint for crop in m³/t；SWF[C]_b、SWF[C]_gnAnd SWF [ C]_greyProducing a blue water footprint, a green water footprint and an ash water footprint for the crop, respectively, in units of m³/t；DWF[C]_b、DWF[C]_gnAnd DWF [ C ]]_greyRespectively producing direct blue water footprints, direct green water footprints and direct grey water footprints for crops in unit m³/t。

9. The life cycle based crop production water footprint calculation method of claim 1, wherein said calculating the water footprint of the crop processed product and determining the water footprint constitutes the following computational expression:

SWF[C]′＝SWF[C]′_b+SWF[C]′_gn+SWF[C]′_grey

in the above expression: SWF [ C ]]' production of Water footprint for crop processed products, Unit m³/t；SWF[C]′_b、SWF[C]′_gnAnd SWF [ C]′_greyProducing a blue water footprint, a green water footprint and a grey water footprint for the crop processing product, respectively, in units of m³/t；SWF[E]_cons，b、SWF[E]_cons，gnAnd SWF [ E ]]_cons，greyRespectively the consumption blue water footprint, the consumption green water footprint and the consumption grey water footprint of the energy product input in the production process of the processed crop product, and the unit m is³/t；A[E]The consumption of the energy product is unit t/t; PWR is the direct blue water consumption in the production process of the crop processed product, unit m³/t；f_vAs a value ratio of the crop processed product, f_pIs the product proportion of the processed crop product.

10. A life cycle based crop production water footprint measurement and calculation system, comprising:

the data acquisition module is used for acquiring production and consumption data of production data related to energy products in crop production, acquiring production and consumption data of production data related to chemical industrial products in crop production, acquiring water footprint data of production data related to agricultural products in measurement and calculation area crop production, acquiring direct water consumption data in the field production process of measurement and calculation area crops, and acquiring production data of processed products of measurement and calculation area crops;

the energy product consumption water footprint calculation module is used for calculating the energy product consumption water footprint according to the production and consumption data of the production data related to the energy product;

the chemical industry production water footprint measuring and calculating module is used for measuring and calculating the production water footprints of chemical industry products and upstream products thereof which are input in the crop production process;

the inter-provincial trade quantity calculation module of the chemical industry is used for calculating inter-provincial trade quantity of chemical industry products and upstream products which are input in the crop production process;

the chemical industry consumption water footprint measuring and calculating module is used for measuring and calculating the chemical industry product consumption water footprint according to the chemical industry product production water footprint, provincial boundary and international trade circulation data input in the crop production process;

the device comprises a crop production indirect water footprint and a measurement and calculation module for forming the same, wherein the measurement and calculation module is used for measuring and calculating the indirect water footprint and the formation of the crop production according to the water footprint and consumption data of different types of production data of energy products, chemical industry products and agricultural products which are input in the crop production process;

the measuring and calculating module is used for measuring and calculating the crop production water footprint and the composition thereof according to the crop production indirect water footprint and the direct water footprint;

the measuring and calculating module is used for measuring and calculating the water footprint of the crop processing product and determining the water footprint composition.

Background

The method is an important basic premise for realizing sustainable and efficient management of regional agricultural water resources while ensuring the development demand of the planting industry. The method is based on quantifying direct water input in the crop production process and indirect water input caused by production data input, simultaneously considers virtual water flow generated by trans-regional trade of each production data input product, measures and calculates the production water footprints and compositions of crops and processed products thereof in the whole life cycle process, and is capable of clearly determining the coupling relation of water, energy and grain in the whole life cycle process of crop production so as to guarantee grain safety and agricultural product supply and demand safety under the constraints of water resources, renewable energy and non-renewable energy, and realizing efficient utilization and overall management of water resources and various energy sources in industrial and industrial production activities.

In the prior art, when the water footprint of crop production is calculated, the indirect water consumption caused by the input of production data in the crop production process and the regional difference of the indirect water consumption are often ignored, meanwhile, under the large background of global trade, the spatial distribution pattern of the water consumption of crops is also influenced by the virtual water flow generated by trade of the production data among regions, the actual consumption of regional agricultural production on water resources and the remote influence on water resources of other regions cannot be accurately reflected by the virtual water flow of the production data, and the accurate reference is difficult to be provided for the regional agricultural water-saving strategy formulation.

Disclosure of Invention

The invention aims to provide a method and a system for measuring and calculating the water footprint of crop production based on a life cycle, aiming at solving the problem of incomplete consideration of the life cycle process of measuring and calculating the water footprint of crop production in the prior art, and the method and the system can improve the measuring and calculating precision of the water footprint of the crop production in a measuring and calculating area and the production of a processed product of the crop.

In order to achieve the purpose, the invention has the following technical scheme:

a method for measuring and calculating a crop production water footprint based on a life cycle comprises the following steps:

-data acquisition comprising:

acquiring production and consumption data of production data related to energy products in crop production;

acquiring production and consumption data of production data related to chemical industrial products in crop production;

acquiring water footprint data of production data related to agricultural products in crop production in a measuring and calculating area;

acquiring direct water consumption data in the field production process of the crops in the measuring and calculating area;

acquiring production data of the crop processing products in the measuring and calculating area;

-calculating an energy product consumption water footprint based on production and consumption data of production data related to the energy product;

-measuring and calculating the production water footprint of chemical industrial products and upstream products thereof put into the crop production process;

-measuring and calculating chemical industrial products and inter-provincial trade volume of upstream products thereof which are input in the crop production process;

-calculating the chemical industry product consumption water footprint according to the chemical industry product production water footprint, the provincial and international trade circulation data input in the crop production process;

-calculating the indirect water footprint of the crop production and its composition according to the water footprint and consumption data of different types of production data of energy products, chemical industry products and agricultural products put into the crop production process;

-calculating the crop production water footprint and its composition from the crop production indirect water footprint and the direct water footprint;

-measuring the water footprint of the crop processed product and determining the water footprint composition.

As a preferred scheme, the production and consumption data of production data related to energy products in crop production is acquired, and the production and consumption data comprises measurement and calculation of regional energy product production water footprints SWF [ E ]]Measuring and calculating regional energy product production Prod [ E ]]Provincial and economic net importI[E]_peAnd international net import quantity I [ E ]]_ceInter-provincial and international traffic distance l, water consumption f_wAnd energy consumption f; the production and consumption data for obtaining production data related to chemical industry products in crop production comprises calculating fresh water consumption DWF [ I ] of chemical industry products input by regional crop production and upstream chemical industry products thereof]_bEnergy consumption of resources A [ P ]]L of wastewater discharge and V of pollutant discharge_pPollutant discharge standard C_maxNatural background concentration C_natRegional production, consumption and international import and export data for various industrial products and their upstream products; the water footprint data for obtaining production data related to agricultural products in crop production in the measuring and calculating area comprises a seed blue water footprint SWF [ A ]]_bGreen water footprint SWF [ A ]]_gnAnd gray water footprint SWF [ A ]]_grey(ii) a The method for acquiring the direct water consumption data in the field production process of the crops in the measuring and calculating area comprises the direct blue water footprint DWF [ C ] of the field production of the crops]_bDirect green water footprint DWF [ C ]]_gnAnd direct gray water footprint DWF [ C ]]_greyAnd field energy product consumption A [ E ]]Consumption of chemical and industrial products A [ I ]]And the consumption of agricultural products A [ A ]](ii) a The method for obtaining the production data of the crop processing products in the measuring and calculating area comprises the steps of measuring and calculating the direct water consumption PWR and the energy consumption AE of the crop processing products in the measuring and calculating area]Value coefficient f of processed product_vAnd product factor f_p。

As a preferred solution, the calculation expression for calculating the water consumption footprint of the energy product is as follows:

in the above formula: SWF [ E ]]_cons，iConsumption water footprint of i energy-saving product, unit m³/t；SWF[E]_i，prod、SWF[E]_jAndrespectively i province, export province j and foreign energy product production water footprintUnit m of³/t；Prod[E]_i、I[E]_j，peAnd I [ E ]]_ceThe yield of the i province energy product, the provincial net import amount and the international net import amount are respectively, and the unit t is; l_iiAndinter-provincial and international distances, unit km, are respectively indicated; f. of_wThe unit m of water consumed by transporting 1km of unit product during inter-provincial transportation³/km；SWF[E′]_jProducing water footprint for fuel of export province j in inter-provincial transportation, wherein the fuel is diesel oil or electric power and has unit m³T or m³/kWh; f is the energy consumption of 1km for provincial transportation of unit products, and the unit t/t.km of diesel oil or the unit kWh/t.km of electric power;refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t；The fuel consumption is 1km of fuel consumed by transporting a unit of product in international transportation, and the unit is t/t.km.

As a preferred scheme, the calculation expression for calculating the production water footprints of chemical industrial products and upstream products thereof input in the crop production process is as follows:

in the above formula: SWF [ I ]]Production of water footprint for chemical industry product, unit m³/t；DWF[I]And IWF [ I]Respectively producing direct water footprints and indirect water footprints for chemical industry products in unit of m³/t；SWF_cons，i[P]The consumption water footprint of the i-th production data input product in the production process of chemical industrial products is unit m³/t；A_i[P]The consumption of the input product for the i-th production data in the production process of chemical industrial products is unit t/t;

according to different sources of water resources, the water footprints of chemical industry products are divided into blue water footprints and grey water footprints, the blue water footprints are surface water consumption and underground water consumption, and the grey water footprints are fresh water required by dilution water pollution; the expression for the grey water footprint is as follows:

in the above formula: SWF [ I ]]_greyUnit m for ash water footprint of chemical industry product³T; l is the discharge amount of wastewater in the production process of chemical industrial products, and the unit m is³/t；V_pThe unit mg/L is the pollutant discharge amount in the production process of chemical industrial products; c_maxIs the emission standard of pollutants, and the unit is mg/L; c_natIs the natural background concentration of the receiving water body, and the unit is mg/L.

As a preferable scheme, the calculation expression for calculating the provincial trade volume of chemical industrial products and upstream products thereof input in the crop production process is as follows:

in the above formula: t is_ijIs the trade volume of a certain product transported from province i to province j, unit t; c. C_ijThe distance from the transportation of a unit product from province i to province j, and the unit is km; f represents the total distance of transportation in km; s_iIs the product outflow amount of province i, unit t; d_jIs the product inflow in province j, unit t.

As a preferred scheme, the calculation expression for calculating the water consumption footprint of the chemical industrial product is as follows:

in the above formula: SWF [ I ]]_cons，iFor i province industrial product consumption water footprint, unit m³/t；SWF[I]_i，prod、SWF[I]_jAndrespectively i province, j province of export and production water footprint of foreign chemical industry products, unit m³/t；Prod[I]_i、I[I]_peAnd I [ I ]]_ceI yield of chemical industry products, provincial net import amount and international net import amount, unit t; SWF [ E ]]_cons，jThe water footprint of fuel consumption of the export province j in inter-provincial transportation is saved, the fuel is diesel oil, and the unit m is³/t；Refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t。

As a preferred scheme, the calculation expression for measuring and calculating the indirect water footprint of crop production and the composition thereof is as follows:

IWF[C]＝IWF[C]_b+IWF[C]_gn+IWF[C]_grey

IWF[C]_gn＝SWF[A]_gn×A[A]

in the above expression: IWF [ C ]]Is an indirect water footprint in the crop production process, and has a unit of m³/t；IWF[C]_b、IWF[C]_gnAnd IWF [ C]_greyRespectively producing an indirect blue water footprint, an indirect green water footprint and an indirect grey water footprint for the crops in units of m³/t；SWF_cons，b，i[E]And SWF_{cons，grey，，i}[E]Respectively the consumption blue water footprint and the grey water footprint of the ith energy product input in the crop field production, and the unit m³/t；A_i[E]The consumption of the ith type energy product is unit t/t; SWF_cons，b，i[I]And SWF_{cons，grey，i}[I]Are respectively cropsConsumption blue water footprint and grey water footprint of class i industrial products put into field production, unit m³/t；A_i[I]The consumption of the ith type industrial product is unit t/t; SWF [ A ]]_b、SWF[A]_gnAnd SWF [ A ]]_greyRespectively the blue water footprint, the green water footprint and the grey water footprint of seeds put into the crop field production, and the unit m³/t；A[A]The consumption of the seeds put into the field production of the crops is t/t.

As a preferred scheme, the calculation expressions for calculating the crop production water footprint and the composition thereof are as follows:

SWF[C]＝SWF[C]_b+SWF[C]_grey+SWF[C]_gn

SWF[C]_b＝DWF[C]_b+IWF[C]_b

SWF[C]_gn＝DWF[C]_gn+IWF[C]_gn

SWF[C]_grey＝DWF[C]_grey+IWF[C]_grey

in the above expression: SWF [ C ]]Producing water footprint for crop in m³/t；SWF[C]_b、SWF[C]_gnAnd SWF [ C]_greyProducing a blue water footprint, a green water footprint and an ash water footprint for the crop, respectively, in units of m³/t；DWF[C]_b、DWF[C]_gnAnd DWF [ C ]]_greyRespectively producing direct blue water footprints, direct green water footprints and direct grey water footprints for crops in unit m³/t。

As a preferred solution, the calculation expression for measuring and calculating the water footprint of the crop processing product and determining the water footprint is as follows:

SWF[C]′＝SWF[C]′_b+SWF[C]′_gn+SWF[C]′_grey

in the above expression: SWF [ C ]]' production of Water footprint for crop processed products, Unit m³/t；SWF[C]′_b、SWF[C]′_gnAnd SWF [ C]′_greyProducing a blue water footprint, a green water footprint and a grey water footprint for the crop processing product, respectively, in units of m³/t；SWF[E]_cons，b、SWF[E]_cons，gnAnd SWF [ E ]]_cons，greyRespectively the consumption blue water footprint, the consumption green water footprint and the consumption grey water footprint of the energy product input in the production process of the processed crop product, and the unit m is³/t；A[E]The consumption of the energy product is unit t/t; PWR is the direct blue water consumption in the production process of the crop processed product, unit m³/t；f_vAs a value ratio of the crop processed product, f_pIs the product proportion of the processed crop product.

The invention also provides a life cycle-based crop production water footprint measuring and calculating system, which comprises:

the data acquisition module is used for acquiring production and consumption data of production data related to energy products in crop production, acquiring production and consumption data of production data related to chemical industrial products in crop production, acquiring water footprint data of production data related to agricultural products in measurement and calculation area crop production, acquiring direct water consumption data in the field production process of measurement and calculation area crops, and acquiring production data of processed products of measurement and calculation area crops;

the energy product consumption water footprint calculation module is used for calculating the energy product consumption water footprint according to the production and consumption data of the production data related to the energy product;

the chemical industry production water footprint measuring and calculating module is used for measuring and calculating the production water footprints of chemical industry products and upstream products thereof which are input in the crop production process;

the inter-provincial trade quantity calculation module of the chemical industry is used for calculating inter-provincial trade quantity of chemical industry products and upstream products which are input in the crop production process;

the chemical industry consumption water footprint measuring and calculating module is used for measuring and calculating the chemical industry product consumption water footprint according to the chemical industry product production water footprint, provincial boundary and international trade circulation data input in the crop production process;

the device comprises a crop production indirect water footprint and a measurement and calculation module for forming the same, wherein the measurement and calculation module is used for measuring and calculating the indirect water footprint and the formation of the crop production according to the water footprint and consumption data of different types of production data of energy products, chemical industry products and agricultural products which are input in the crop production process;

the measuring and calculating module is used for measuring and calculating the crop production water footprint and the composition thereof according to the crop production indirect water footprint and the direct water footprint;

the measuring and calculating module is used for measuring and calculating the water footprint of the crop processing product and determining the water footprint composition.

Compared with the prior art, the invention has the following beneficial effects: on the basis of the traditional crop water consumption quantification, the method combines the production data input in the crop life cycle and the crop production water footprint in the post-partum processing process, distinguishes the local water consumption, the provincial water consumption and the international water consumption consumed by the production data in the crop production process by calculating the production data production water footprint in the crop production and considering the virtual water flow of each production data under the trans-regional trade, thereby distinguishing the production water footprints of the crops and the crop processing products and the detailed compositions thereof, improving the measuring and calculating precision of measuring and calculating the production water footprints of the regional crops and the processing products thereof, and providing method reference for crop production water footprint accounting and regional agriculture water saving strategy formulation.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of a method for measuring and calculating a crop production water footprint based on a life cycle.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Based on the embodiments of the present invention, those skilled in the art can make several simple modifications and decorations without creative efforts, and all other embodiments obtained belong to the protection scope of the present invention.

Referring to fig. 1, the method for measuring and calculating the production water footprint of crops based on life cycle comprises the following steps:

step 1: obtaining production and consumption data of production data related to energy products in crop production, including measuring and calculating regional energy product production water footprint SWF [ E ]]Measuring and calculating regional energy product production Prod [ E ]]Provincial clean import amount I [ E ]]_peAnd international net import quantity I [ E ]]_ceInter-provincial and international traffic distance l, water consumption f_wAnd energy consumption f; obtaining production and consumption data of production data related to chemical industry products in crop production, including calculating fresh water consumption DWF [ I ] of chemical industry products input by regional crop production and upstream chemical industry products thereof]_bEnergy consumption of resources A [ P ]]L of wastewater discharge and V of pollutant discharge_pPollutant discharge standard C_maxNatural background concentration C_natRegional production, consumption and international import and export data for various industrial products and their upstream products; obtaining water footprint data of production data related to agricultural products in crop production in measuring and calculating area, including seed blue water footprint SWF [ A ]]_bGreen water footprint SWF [ A ]]_gnAnd gray water footprint SWF [ A ]]_grey(ii) a Obtaining direct water consumption data in the field production process of the crops in the measuring and calculating area, wherein the direct water consumption data comprises the direct blue water footprint DWF [ C ] of the field production of the crops]_bDirect green water footprint DWF [ C ]]_gnAnd direct gray water footprint DWF [ C ]]_greyAnd consumption of field energy productsAmount A [ E ]]Consumption of chemical and industrial products A [ I ]]And the consumption of agricultural products A [ A ]](ii) a Obtaining production data of the processed products of the plants in the measurement and calculation area, including direct water consumption PWR and energy consumption AE of the processed products of the plants in the measurement and calculation area]Value coefficient f of processed product_vAnd product factor f_p。

Step 2: and calculating the consumption water footprint of the energy product according to the production water footprint and the trade data of the energy product. Related energy products involved in crop production include coal, oil, natural gas, and electricity. The consumption water footprint refers to the average water footprint of a certain product consumed in the area, namely the weighted average after considering the local production water consumption, the outlet virtual water and the inlet virtual water is as follows:

in formula (1): SWF [ E ]]_cons，iConsumption water footprint of i energy-saving product, unit m³/t；SWF[E]_i，prod、SWF[E]_jAndrespectively i province, j province of export and production water footprint of foreign energy products, unit m³/t；Prod[E]_i、I[E]_j，peAnd I [ E ]]_ceThe yield of the i province energy product, the provincial net import amount and the international net import amount are respectively, and the unit t is; l_ijAndinter-provincial and international distances, unit km, are respectively indicated; f. of_wThe unit m of water consumed by transporting 1km of unit product during inter-provincial transportation³/km；SWF[E′]_jProducing water footprint for fuel of export province j in inter-provincial transportation, wherein the fuel is diesel oil or electric power and has unit m³T or m³/kWh; f is the energy consumption of 1km for provincial transportation of unit products, and the unit t/t.km of diesel oil or the unit kWh/t.km of electric power;refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t；The fuel consumption is 1km of fuel consumed by transporting a unit of product in international transportation, and the unit is t/t.km.

And step 3: and measuring and calculating the production water footprint of related industrial products in the crop production process. Chemical industry products which are put into the crop production process comprise nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, pesticide and agricultural film, the water footprint of the production of the chemical industry products is calculated according to the material consumption list of each product and pollutant emission data, a plurality of upstream products can be related, and the calculation is sequentially carried out from top to bottom:

in formula (2): SWF [ I ]]Production of water footprint for chemical industry product, unit m³/t；DWF[I]And IWF [ I]Respectively producing direct water footprints and indirect water footprints for chemical industry products in unit of m³/t；SWF_cons，i[P]The consumption water footprint of the i-th production data input product in the production process of the chemical industry product, wherein the input product comprises an energy product and the chemical industry product, and the unit m is³/t；A_i[P]The unit t/t is the consumption of the input product of the i-th production data in the production process of chemical industrial products.

According to different sources of water resources, the water footprints of chemical industry products can be divided into blue water footprints and grey water footprints, the blue water footprints are surface water consumption and underground water consumption, the grey water footprints are fresh water required by dilution water pollution, and the expression of the grey water footprints is as follows:

in formula (3): SWF [ I ]]_greyUnit m for ash water footprint of chemical industry product³T; l is the wastewater discharge amount in the production process of chemical industrial productsBit m³/t；V_pThe unit mg/L is the pollutant discharge amount in the production process of chemical industrial products; c_maxIs the emission standard of pollutants, and the unit is mg/L; c_natIs the natural background concentration of the receiving water body, and the unit is mg/L.

And 4, step 4: measuring and calculating chemical industrial products and the intersomatic trade volume of upstream products thereof which are input in the crop production process according to the production volume, the consumption volume and the international import and export volume of the regional chemical industrial products:

in formula (4): t is_ijIs the trade volume of a certain product transported from province i to province j, unit t; c. C_ijThe distance from the transportation of a unit product from province i to province j, and the unit is km; f represents the total distance of transportation in km; s_iIs the product outflow amount of province i, unit t; d_jIs the product inflow in province j, unit t.

And 5: according to the production water footprint of chemical industry products input in the crop production process and the provincial and international trade circulation data, the consumption water footprint of the chemical industry products is measured and calculated:

in formula (5): SWF [ I ]]_cons，iFor i province industrial product consumption water footprint, unit m³/t；SWF[I]_i，prod、SWF[I]_jAndrespectively i province, j province of export and production water footprint of foreign chemical industry products, unit m³/t；Prod[I]_i、I[I]_peAnd I [ I ]]_ceI yield of chemical industry products, provincial net import amount and international net import amount, unit t; SWF [ E ]]_cons，jThe water consumption footprint of the fuel of the province j is exported in inter-provincial transportation, and the fuel is diesel oil with the unit of m 3/t;refers to the water footprint of fuel production in international transportation, and is calculated by diesel oil in unit of m³/t。

Step 6: and measuring and calculating the indirect water footprint of the crop production. The indirect water footprint of crop production and the measurement and calculation of the composition need to be carried out by combining the consumption water footprints and the consumption amounts of three different types of production data of energy products, chemical industry products and agricultural products which are input in the crop production process, wherein the energy products comprise diesel oil and electric power in the crop production process, the chemical industry products comprise nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, pesticide and agricultural film, and the agricultural products are seeds:

IWF[C]＝IWF[C]_b+IWF[C]_gn+IWF[C]_grey (6)

IWF[C]_gn＝SWF[A]_gn×A[A] (8)

in formulae (6), (7), (8) and (9): IWF [ C ]]Is an indirect water footprint in the crop production process, and has a unit of m³/t；IWF[C]_b、IWF[C]_gnAnd IWF [ C]_greyRespectively producing an indirect blue water footprint, an indirect green water footprint and an indirect grey water footprint for the crops in units of m³/t；SWF_cons，b，i[E]And SWF_{cons，grey，，i}[E]Respectively the consumption blue water footprint and the grey water footprint of the ith energy product input in the crop field production, and the unit m³/t；A_i[E]The consumption of the ith type energy product is unit t/t; SWF_cons，b，i[I]And SWF_{cons，grey，i}[I]Respectively the consumption blue water footprint and grey water footprint of the i-th industrial product input in the crop field production, and the unit m³/t；A_i[I]The consumption of the ith type industrial product is unit t/t; SWF [ A ]]_b、SWF[A]_gnAnd SWF [ A ]]_greyRespectively the blue water footprint, the green water footprint and the grey water footprint of seeds put into the crop field production, and the unit m³/t；A[A]The consumption of the seeds put into the field production of the crops is t/t.

And 7: calculating the crop production water footprint and the composition thereof according to the crop production indirect water footprint and the direct water footprint;

SWF[C]＝SWF[C]_b+SWF[C]_grey+SWF[C]_gn (10)

SWF[C]_b＝DWF[C]_b+IWF[C]_b (11)

SWF[C]_gn＝DWF[C]_gn+IWF[C]_gn (12)

SWF[C]_grey＝DWF[C]_grey+IWF[C]_grey (13)

in formulae (10), (11), (12) and (13): SWF [ C ]]Producing water footprint for crop in m³/t；SWF[C]_b、SWF[C]_gnAnd SWF [ C]_greyProducing a blue water footprint, a green water footprint and an ash water footprint for the crop, respectively, in units of m³/t；DWF[C]_b、DWF[C]_gnAnd DWF [ C ]]_greyRespectively producing direct blue water footprints, direct green water footprints and direct grey water footprints for crops in unit m³/t。

And 8: and measuring and calculating the water footprint of the crop processing product and determining the water footprint composition. The crop processing process is a multi-input multi-output process, the production water footprint of the crop processing product and the composition thereof are determined by combining the production water footprint of the crop, the consumption water footprint of the input energy product and the product coefficient and value coefficient of the processing product:

SWF[C]′＝SWF[C]′_b+SWF[C]′_gn+SWF[C]′_grey (14)

in formulae (14), (15), (16) and (17): SWF [ C ]]' production of Water footprint for crop processed products, Unit m³/t；SWF[C]′_b、SWF[C]′_gnAnd SWF [ C]′_greyProducing a blue water footprint, a green water footprint and a grey water footprint for the crop processing product, respectively, in units of m³/t；SWF[E]_cons，b、SWF[E]_cons，gnAnd SWF [ E ]]_cons，greyRespectively the consumption blue water footprint, the consumption green water footprint and the consumption grey water footprint of the energy product input in the production process of the processed crop product, and the unit m is³/t；A[E]The consumption of the energy product is unit t/t; PWR is the direct blue water consumption in the production process of the crop processed product, unit m³/t；f_vAs a value ratio of the crop processed product, f_pIs the product proportion of the processed crop product.

The invention provides a life cycle-based method for measuring and calculating a crop production water footprint, which introduces a measuring and calculating frame considering production data input in a crop life cycle and a crop production water footprint in a post-production processing process on the basis of traditional crop water consumption quantification, distinguishes local water consumption, provincial water consumption and international water consumption consumed by production data in the crop production process by measuring and calculating the production data production water footprint in the crop production and considering virtual water flow under trans-regional trade of each production data, thereby distinguishing the production water footprints of crops and crop processing products and detailed compositions thereof, improving the precision of the measurement and calculation of the production water footprints of regional crops and processing products thereof, and providing method reference for calculating the production water footprint of the crops and formulating regional agricultural water saving strategies.

The invention also provides a life cycle-based crop production water footprint measuring and calculating system, which comprises:

the data acquisition module is used for acquiring production and consumption data of production data related to energy products in crop production, acquiring production and consumption data of production data related to chemical industrial products in crop production, acquiring water footprint data of production data related to agricultural products in measurement and calculation area crop production, acquiring direct water consumption data in the field production process of measurement and calculation area crops, and acquiring production data of processed products of measurement and calculation area crops;

the energy product consumption water footprint calculation module is used for calculating the energy product consumption water footprint according to the production and consumption data of the production data related to the energy product;

the chemical industry production water footprint measuring and calculating module is used for measuring and calculating the production water footprints of chemical industry products and upstream products thereof which are input in the crop production process;

the inter-provincial trade quantity calculation module of the chemical industry is used for calculating inter-provincial trade quantity of chemical industry products and upstream products which are input in the crop production process;

the chemical industry consumption water footprint measuring and calculating module is used for measuring and calculating the chemical industry product consumption water footprint according to the chemical industry product production water footprint, provincial boundary and international trade circulation data input in the crop production process;

the device comprises a crop production indirect water footprint and a measurement and calculation module for forming the same, wherein the measurement and calculation module is used for measuring and calculating the indirect water footprint and the formation of the crop production according to the water footprint and consumption data of different types of production data of energy products, chemical industry products and agricultural products which are input in the crop production process;

the measuring and calculating module is used for measuring and calculating the crop production water footprint and the composition thereof according to the crop production indirect water footprint and the direct water footprint;

the measuring and calculating module is used for measuring and calculating the water footprint of the crop processing product and determining the water footprint composition.

While the invention has been described above with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, and those modifications and variations are within the scope of the claims of the invention and their equivalents.