Evaluation methods, systems, equipment and storage media for the effects of low-carbon technologies on farmland

Abstract

The present invention provides a method, system, device and storage medium for evaluating the effect of low-carbon technology for farmland, and relates to the field of low-carbon technology for farmland. The method comprises: determining the net emission intensity of greenhouse gases of the farmland to be evaluated according to the low-carbon technology for farmland; determining the crop yield of the farmland to be evaluated; and comprehensively evaluating the carbon reduction measures of the farmland to be evaluated by using the size of the net emission intensity and the crop yield. The present invention solves the problem that carbon reduction measures cannot be comprehensively evaluated in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of farmland low-carbon technology, and in particular to an evaluation method, system, equipment and storage medium for the effect of farmland low-carbon technology. Background Art

[0002] Carbon emission assessment and reduction are related to national development rights and interests and people's well-being, and exploring farmland carbon sequestration and emission reduction is crucial to achieving this goal. Farmland is one of the largest anthropogenic sources of atmospheric non-CO2 farmland greenhouse gases (CH4 and N2O), and is also the cornerstone of ensuring national food security and people's livelihood. The total CH4 and N2O emissions from farmland in my country are 475 million tons of CO2 equivalent, accounting for 23% of the total non-CO2 farmland greenhouse gas emissions in the country. As fossil energy is gradually replaced by clean energy, the relative contribution of farmland CH4 and N2O emissions will increase accordingly, and their contribution to emission reduction will become more prominent. In addition, my country's farmland soil has huge carbon sequestration potential, which is estimated to reach 82 million tons of CO2 equivalent per year, equivalent to 17% of the total greenhouse gas emissions from farmland. Therefore, on the basis of ensuring food security, the comprehensive effect of farmland carbon sequestration and emission reduction synergistic technologies is systematically evaluated.

[0003] At present, there is still a lack of clear methods and technical systems for the evaluation of carbon sequestration and emission reduction technologies in farmland soils, and it is impossible to comprehensively evaluate the "trade-off" effect and social and economic benefits that may be caused by carbon reduction measures. For example, water and fertilizer (straw return and nitrogen fertilizer application) management have a significant impact on farmland greenhouse gas emissions and soil organic carbon content, resulting in a dynamic balance between farmland greenhouse gas emission reduction and soil carbon sequestration. Compared with continuous flooding, intermittent irrigation can significantly reduce CH4 emissions from rice fields, but it also greatly promotes the decomposition of soil organic carbon, which may make the amount of emission reduction less than the amount of decomposition, resulting in a carbon source effect. Compared with not returning straw to the field, returning straw to the field promotes soil organic carbon accumulation, but it also greatly increases CH4 emissions from rice fields, resulting in carbon sequestration far less than carbon emissions (both converted to CO2 equivalents), and it is not a carbon sink overall. Nitrogen fertilizer application not only increases crop yield and biomass, which is beneficial to soil organic carbon accumulation, but also promotes N2O emissions and increases carbon emissions, so the comprehensive impact on the soil carbon source and sink function is not clear. Summary of the invention

[0004] In order to overcome the shortcomings of the existing evaluation system, the purpose of the present invention is to provide an evaluation method, system, equipment and storage medium for the effect of low-carbon technology in farmland. The present invention solves the problem that carbon reduction measures cannot be comprehensively evaluated in the existing system.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A method for evaluating the effect of low-carbon technology on farmland, comprising:

[0007] Determine the net greenhouse gas emission intensity of the farmland to be evaluated based on the farmland low-carbon technology;

[0008] Determine the crop yield of the farmland to be evaluated;

[0009] The net emission intensity and crop yield are used to conduct a comprehensive evaluation of carbon reduction measures for the farmland to be evaluated.

[0010] Preferably, the determining of the net greenhouse gas emission intensity of the farmland to be evaluated comprises:

[0011] Determine the soil bulk density, soil layer thickness and soil organic carbon content of the farmland to be evaluated;

[0012] Determine the soil organic carbon storage of the farmland to be evaluated based on the soil bulk density, soil layer thickness and soil organic carbon content;

[0013] determining a soil organic carbon change rate based on the soil organic carbon stock;

[0014] The total amount of greenhouse gas emissions from farmland was calculated;

[0015] The crop yield is calculated based on the crop yield per unit area and the crop harvest area of ​​the farmland to be evaluated;

[0016] The net greenhouse gas emissions from farmland are calculated based on the total greenhouse gas emissions from farmland and the rate of change of organic carbon;

[0017] The net emission intensity of greenhouse gases from farmland is calculated based on the net greenhouse gas emissions from farmland.

[0018] Preferably, the calculation formula for soil organic carbon storage is:

[0019] SOCS = SOC × ρ × H × 100;

[0020] Where SOCS is soil organic carbon storage, ρ is soil bulk density, and H is soil layer thickness.

[0021] Preferably, the calculation formula for the organic carbon change rate is:

[0022]

[0023] Among them, SOCS final is the soil organic carbon stock at the end of the experiment, SOCS initial is the soil organic carbon stock at the beginning of the experiment.

[0024] Preferably, the calculation formula for the total amount of greenhouse gas emissions from farmland is:

[0025] GHG=CO2×1+CH4×27.9+N2O×273;

[0026] Among them, GHG is the total greenhouse gas emissions from farmland, CO2 is carbon dioxide, CH4 is methane, and N2O is nitrous oxide.

[0027] Preferably, the calculation formula for the crop yield is:

[0028] Yield = S × A;

[0029] Among them, Yield is the crop yield, S is the crop yield per unit area, and A is the crop harvest area.

[0030] Preferably, the calculation formula for the net greenhouse gas emissions from farmland is:

[0031]

[0032] Among them, Net GHG is the net greenhouse gas emissions from farmland.

[0033] Preferably, the calculation formula for the net emission intensity of greenhouse gases from farmland is:

[0034]

[0035] Among them, Net GHGI is the net emission intensity of greenhouse gases from farmland.

[0036] An evaluation system device for the effect of low-carbon technology on farmland, comprising:

[0037] A first data determination module is used to determine the net emission intensity of greenhouse gases of the farmland to be evaluated according to the farmland low-carbon technology;

[0038] The second data determination module is used to determine the crop yield of the farmland to be evaluated;

[0039] The evaluation module is used to comprehensively evaluate the carbon reduction measures of the farmland to be evaluated by using the net emission intensity and the crop yield.

[0040] An evaluation system device for the effect of low-carbon technology on farmland, comprising:

[0041] at least one processing unit;

[0042] and at least one memory and bus connected to the processing unit;

[0043] The processing unit and the memory communicate with each other via the bus; the processing unit is used to call program instructions in the memory to execute any method described in claims 1-7.

[0044] A storage medium for evaluating the effect of low-carbon technology on farmland, on which a computer program is stored, including:

[0045] When the computer program is executed by a processor, the steps in a method for evaluating the effect of low-carbon technology on farmland are implemented.

[0046] The present invention discloses the following technical effects:

[0047] The present invention provides a method, system, device and storage medium for evaluating the effect of low-carbon technology for farmland. The method includes: determining the net emission intensity of greenhouse gases of the farmland to be evaluated according to the low-carbon technology for farmland; determining the crop yield of the farmland to be evaluated; and using the net emission intensity and the crop yield to comprehensively evaluate the carbon reduction measures of the farmland to be evaluated. The present invention obtains the net emission intensity and the crop yield by calculation, and uses the net emission intensity and the crop yield to evaluate the farmland, thereby improving the accurate measurement and evaluation effect of the low-carbon technology for farmland. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 A flow chart of a method for evaluating the effect of low-carbon technology for farmland provided by an embodiment of the present invention;

[0050] Figure 2 A comparison chart of the average results of early and late rice for six consecutive years provided in an embodiment of the present invention;

[0051] Figure 3 This is a comparison chart of the results of rice and wheat for three consecutive years provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] The terms "first", "second", "third" and "fourth" in the specification and claims of the present application and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a series of steps, processes, methods, etc. are not limited to the listed steps, but may optionally include steps that are not listed, or may optionally include other step elements inherent to these processes, methods, products or devices.

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] like Figure 1 As shown, the present invention provides a method for evaluating the effect of low-carbon technology for farmland, comprising:

[0057] Step 100: Determine the net greenhouse gas emission intensity of the farmland to be evaluated based on the farmland low-carbon technology;

[0058] Step 200: Determine the crop yield of the farmland to be evaluated;

[0059] Step 300: Comprehensively evaluate the carbon reduction measures of the farmland to be evaluated using the net emission intensity and crop yield.

[0060] Specifically, in order to facilitate a better understanding of this solution, the necessary technical terms are introduced below:

[0061] Greenhouse gas: refers to the gaseous components that exist naturally in the atmosphere and are produced by human activities and can absorb and emit radiation waves with wavelengths in the infrared spectrum generated by the earth's surface, atmosphere and clouds.

[0062] Farmland greenhouse gas emissions: refers to the greenhouse gases released directly from farmland into the atmosphere, including carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). The total amount of emissions is measured in carbon dioxide equivalent (CO2-eq).

[0063] Changes in soil organic carbon content: Changes in the organic carbon content in the cultivated layer of farmland soil.

[0064] Net greenhouse gas emissions from farmland: Farmland is a source of greenhouse gas emissions, but it also has a carbon sequestration effect. "Net greenhouse gas emissions" is a dynamic balance that comprehensively considers greenhouse gas emissions from farmland and soil organic carbon accumulation, that is, the amount of greenhouse gas emissions from farmland minus the amount of organic carbon fixed in the soil converted into carbon absorption, which scientifically characterizes the comprehensive effect of carbon sequestration and emission reduction.

[0065] Low-carbon farmland technology refers to field management measures or technologies that can directly or indirectly achieve low / low carbon emissions in the crop production process within a specified period of time.

[0066] Farmland low-carbon technology evaluation: A systematic and independent field management technology or activity that can directly or indirectly reduce farmland carbon emissions, carried out to obtain and evaluate objective evidence to verify the technical level, practicality, and expected benefits of the low-carbon technology being evaluated.

[0067] Evaluation indicators of farmland low-carbon technology: specific indicators used to characterize the technical level, practicality and expected benefits of the evaluated low-carbon technology, including five sub-indicators of soil organic carbon content (SOC), CO2 emissions, CH4 emissions, N2O emissions and crop yield (Yield), as well as three comprehensive indicators of total emissions (GHG), net emissions (Net GHG) and net emission intensity (Net GHGI). Among them, crop yield and net emission intensity are binding indicators to ultimately determine the comprehensive effect of the technology.

[0068] Furthermore, the emission, organic carbon storage, and crop yield of each farmland greenhouse gas in a certain period of time under the low-carbon technology and baseline scenarios are calculated respectively, and then the corresponding net emission intensity of farmland greenhouse gases is summarized. The reduction in net emission intensity of farmland greenhouse gases is the difference between the net emission intensity of the low-carbon technology application scenario and the baseline scenario, calculated as follows:

[0069] ΔNet GHGI=Net GHGI Base -NetGHGI Tech ;

[0070] Among them, ΔNet GHGI is the net emission intensity reduction of farmland greenhouse gases, t CO2-eq / t yield; NetGHGI Base Net GHGI is the net greenhouse gas emission intensity of farmland in the absence of technology benchmark, t CO2-eq / t yield; Tech is the net emission intensity of greenhouse gases from farmland when low-carbon technologies are applied, t CO2-eq / tyield.

[0071] The smaller the reduction in the net greenhouse gas emission intensity of farmland, the better the carbon sequestration, emission reduction and yield-increasing effects of the technology.

[0072] Furthermore, the determination of the net greenhouse gas emission intensity of the farmland to be evaluated includes:

[0073] Determine the soil bulk density, soil layer thickness and soil organic carbon content of the farmland to be evaluated;

[0074] Determine the soil organic carbon storage of the farmland to be evaluated based on the soil bulk density, soil layer thickness and soil organic carbon content;

[0075] determining a soil organic carbon change rate based on the soil organic carbon stock;

[0076] The total amount of greenhouse gas emissions from farmland was calculated;

[0077] The crop yield is calculated based on the crop yield per unit area and the crop harvest area of ​​the farmland to be evaluated;

[0078] The net greenhouse gas emissions from farmland are calculated based on the total greenhouse gas emissions from farmland and the rate of change of organic carbon;

[0079] The net emission intensity of greenhouse gases from farmland is calculated based on the net greenhouse gas emissions from farmland.

[0080] The net emission intensity of greenhouse gases from farmland mainly involves indicators such as soil organic carbon change rate, total greenhouse gas emissions from farmland, crop yield, and net greenhouse gas emissions from farmland. The calculation methods for each indicator are as follows:

[0081] The calculation formula for soil organic carbon storage is:

[0082] SOCS = SOC × ρ × H × 100;

[0083] Where SOCS is soil organic carbon storage, t C / ha; SOC is soil organic carbon content, g C / kg; ρ is soil bulk density, g / cm 3 ; H is the soil layer thickness, cm.

[0084] Furthermore, the calculation formula for the organic carbon change rate is:

[0085]

[0086] Among them, SOCS final is the soil organic carbon stock at the end of the experiment, t C / ha; SOCS initial is the soil organic carbon stock at the beginning of the experiment, t C / ha; t is the duration of the experiment, yr (year), usually more than 3 years.

[0087] The calculation formula for the total amount of greenhouse gas emissions from farmland is:

[0088] GHG=CO2×1+CH4×27.9+N2O×273;

[0089] Among them, GHG is the total greenhouse gas emissions from farmland, CO2 is carbon dioxide, CH4 is methane, and N2O is nitrous oxide. Furthermore, GHG is the total greenhouse gas emissions from farmland at the 100-year scale of the IPCC Sixth Assessment Report, t CO2-eq / ha; 27.9 is the multiple of the warming potential of CH4 to CO2 at the 100-year scale of the IPCC Sixth Assessment Report; 273 is the multiple of the warming potential of N2O to CO2 at the 100-year scale of the IPCC Sixth Assessment Report. Note: Unless otherwise specified, the warming potential of CH4 and N2O in this invention adopts the latest values ​​published by the IPCC.

[0090] Furthermore, the calculation formula for the crop yield is:

[0091] Yield = S × A;

[0092] Among them, Yield is the crop yield, t / ha; S is the crop yield per unit area, g / m 2 ; A is the crop harvest area, ha.

[0093] Furthermore, the calculation formula for the net greenhouse gas emissions from farmland is:

[0094]

[0095] Among them, Net GHG is the net greenhouse gas emissions from farmland, t CO2-eq / ha; 44 / 12 is the conversion factor of carbon into CO2.

[0096] Furthermore, the calculation formula for the net emission intensity of greenhouse gases from farmland is:

[0097]

[0098] Among them, Net GHGI is the net emission intensity of greenhouse gases from farmland.

[0099] By comparing the net greenhouse gas emission intensity (Net GHGI) index of different farmland low-carbon technologies, the smaller the value, the better the carbon fixation, emission reduction and yield-enhancing effects of the technology.

[0100] The present invention also provides the following embodiments:

[0101] Results of six consecutive years of trials in double-season rice areas:

[0102] In the southern double-season rice-growing areas, winter rainfall is relatively high. If rice fields are not drained after late rice harvest, the fields will be flooded, leading to large amounts of methane emissions in the current and subsequent rice seasons. Therefore, converting abandoned rice fields in winter into drained and plowed rice fields will significantly reduce methane emissions.

[0103] 1. Abandonment of rice fields in winter (control): After the late rice is harvested, the soil is not plowed or drained, and the stubble (about 15-20 cm) is returned to the field. Before transplanting early and late rice in the second year, the rice fields are plowed, harrowed, and leveled according to local production habits before planting rice. After transplanting early and late rice, field water management is carried out in accordance with local routine water management (flooding in the early stage, baking the field in the middle stage, alternating dry and wet in the late stage, and draining and drying in the final stage). After the early rice is harvested, all straw and stubble are removed from the rice fields. The static box method is used to in situ observe the greenhouse gas (CH4 and N2O) emission fluxes from farmland throughout the year. Soil is taken before rice transplanting and after harvesting to determine the organic carbon content, and rice yield is measured at harvest time.

[0104] 2. Drainage and tillage of rice fields in winter: After the late rice is harvested, the soil is plowed and drained, and the stubble (about 15-20cm) is plowed and returned to the field. Before transplanting early and late rice in the second year, the rice fields are plowed, harrowed, and leveled according to local production habits before planting rice. After transplanting early and late rice, field water management is carried out in accordance with local routine water management (flooding in the early stage, baking the field in the middle stage, alternating dry and wet in the late stage, and drainage and drying in the final stage). After the early rice is harvested, all straw and stubble are removed from the rice fields. The static box method is used to in situ observe the greenhouse gas (CH4 and N2O) emission fluxes from farmland throughout the year. Soil is taken before rice transplanting and after harvesting to determine the organic carbon content, and rice yield is measured at the harvest time.

[0105] 3. Plowing of rice fields without drainage in winter: After the late rice is harvested, the soil is plowed but not drained, and the stubble (about 15-20cm) is plowed and returned to the field. Before transplanting early and late rice in the second year, the rice fields are plowed, harrowed, leveled, and other operations are carried out according to local production habits before planting rice. After transplanting early and late rice, field water management is carried out in accordance with local routine water management (flooding in the early stage, baking the field in the middle stage, alternating dry and wet in the late stage, and draining and drying in the final stage). After the early rice is harvested, all straw and stubble are removed from the rice fields. The static box method is used to in situ observe the greenhouse gas (CH4 and N2O) emission fluxes from farmland throughout the year. Soil is taken before transplanting and after harvesting rice to determine the organic carbon content, and rice yield is measured at the harvest time.

[0106] The average results of early and late rice for six consecutive years show that ( Figure 2 ), the net greenhouse gas emissions from drained and plowed farmland is -1.09t CO2-eq ha -1 , which was significantly reduced by 160% and 227% compared with the abandoned land and undrained tillage, respectively; the total rice yield (Yield) of the drainage tillage was the highest (13.15t ha -1 ), which is 3.7% higher than that of abandoned land; the comprehensive analysis of Net GHG and Yield shows that the net greenhouse gas emission intensity of drained and plowed farmland is as low as -0.083t CO2-eq ha -1The other two treatments had positive Net GHGI values ​​(0.067-0.137 t CO2-eq ha -1 In summary, changing winter abandoned rice fields into winter drained and tilled rice fields can not only achieve the highest rice yield, but also achieve negative carbon emissions from rice fields, which is a recommended low-carbon technology.

[0107] The present invention further provides the following specific embodiments:

[0108] Results of three consecutive years of trials in the rice-wheat rotation area:

[0109] Replacing chemical fertilizers with organic fertilizers is a common fertilizer application method in crop production, which not only helps to improve soil quality and soil fertility, but also increases crop yields. However, the use of organic substitution in rice cultivation will lead to more methane emissions. Therefore, whether organic substitution is a carbon source or a carbon sink depends on its combined impact on the increase in soil organic carbon content and methane emissions, which is closely related to the proportion of organic substitution.

[0110] 1. 100% urea application: rice and wheat planting, nitrogen fertilizer application rate per season is 240kgN ha -1 urea, no organic fertilizer was applied; during the experiment, all rice and wheat straw were removed from the field. Static chamber method was used to observe farmland greenhouse gas (CH4 and N2O) emission fluxes in situ throughout the year, soil was taken before transplanting rice and wheat and after harvesting to determine organic carbon content, and rice and wheat yields were measured at harvest time.

[0111] 2. 25% organic fertilizer replacement: Rice and wheat planting, nitrogen fertilizer application rate per season is 240kgN ha -1 , of which 75% was urea and 25% was food waste compost; during the experiment, all rice straw and wheat straw were removed from the field. The static chamber method was used to observe the greenhouse gas (CH4 and N2O) emission flux from farmland in situ throughout the year, and the organic carbon content was measured in soil before transplanting rice and wheat and after harvesting, and the rice and wheat yields were measured at harvest time.

[0112] 3. 50% organic fertilizer replacement: Rice and wheat planting, nitrogen fertilizer application rate per season is 240kgN ha -1 , of which 50% was urea and 50% was food waste compost; during the experiment, all rice straw and wheat straw were removed from the field. The static chamber method was used to observe the greenhouse gas (CH4 and N2O) emission flux from farmland in situ throughout the year, and the organic carbon content was measured in soil before transplanting rice and wheat and after harvesting, and the rice and wheat yields were measured at harvest time.

[0113] The results of rice and wheat for three consecutive years show that ( Figure 3 ), the net greenhouse gas emissions of farmland with 25% and 50% organic fertilizer replacement were -2.35 and -4.54t CO2-eqha, respectively.-1 , which was significantly reduced by 134% and 166% compared with 100% urea application; the total yield of rice and wheat in both seasons (Yield) reached 14.0t ha -1 , which was significantly increased by 3.3% compared with 100% urea application; the comprehensive Net GHG and Yield found that the net greenhouse gas emission intensity of farmland replaced by 25% and 50% organic fertilizer was as low as -0.17 and -0.32t CO2-eq ha -1 yield, while the Net GHGI for 100% urea application was positive (0.51t CO2-eq ha - 1 This shows that the rice-wheat rotation system using 25% and 50% organic fertilizers instead of chemical fertilizers can not only achieve the highest rice and wheat yields, but also achieve negative carbon emissions from rice fields, which is a recommended low-carbon technology.

[0114] In addition, 25% and 50% pig manure composting also had similar results, but the carbon emission reduction effect was slightly worse than that of 25% and 50% food waste composting, so they are not listed here.

[0115] The beneficial effects of the present invention are as follows:

[0116] The application of the present invention can bring economic benefits to the technology implementers, mainly in terms of optimizing emission reduction costs and increasing crop yields. There are many carbon emission links in farmland soil in my country, uneven spatial distribution, complex influencing factors, weak targeted emission reduction measures, and unclear emission reduction costs. The research and development of the effect evaluation method of low-carbon technology in farmland is conducive to accurately locking in the carbon emission hotspots in different regions or crop production systems and screening out carbon sequestration and emission reduction strategies that are adapted to local conditions. Systematically evaluate the implementation costs and carbon reduction and sink effects of different carbon sequestration and emission reduction schemes, and clarify the promotion scheme with the best carbon reduction and sink effect per unit implementation cost, so as to maximize the reduction of emission reduction costs and increase emission reduction benefits. For example, for carbon sequestration and emission reduction in flooded rice field soil, the cost input and carbon reduction and sink output ratio of optimizing water management methods are better than returning straw to the field; for carbon sequestration and emission reduction in dryland soil, the cost input and carbon reduction and sink output ratio of optimizing nitrogen fertilizer application are better than the application of field nitrification inhibitors. In addition, the research and development of the evaluation method for the effectiveness of low-carbon technology in farmland is based on maintaining and increasing production, eliminating "consumptive" emission reduction strategies that are not conducive to food security, and screening out optimized plans for the synergy of carbon fixation and emission reduction and crop yields, thereby ensuring the economic benefits of farmers and helping to increase their enthusiasm for the application and promotion of emission reduction measures.

[0117] The application of this evaluation method can bring about extensive social benefits, which are mainly reflected in the fact that my country is the world's largest grain producer, farmland greenhouse gas emitter, and nitrogen fertilizer producer and consumer.

[0118] The present invention is conducive to improving water management methods (such as changing flood irrigation to intermittent irrigation), optimizing nitrogen fertilizer application and straw return to the field, reducing greenhouse gas and active nitrogen emissions from farmland, increasing yield benefits and ecological environmental benefits, and promoting environmental sustainable development. For example, recent studies have found that the total value of yield benefits, climate benefits, health benefits, and ecosystem benefits generated by promoting optimized nitrogen fertilizer application methods in global farmland is as high as 476 billion US dollars, which is more than 20 times the cost of promoting these nitrogen fertilizer optimization programs. In addition, the improvement of soil organic carbon pool is one of the key indicators in the evaluation system of low-carbon technology effects in farmland. The research and development and application of this technical method are conducive to screening out optimization measures to improve the fertility of farmland soil and improve degraded soil in my country, and improve the social security function of existing cultivated land.

[0119] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0120] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for evaluating the effect of low-carbon technology on farmland, characterized in that: include: Determine the net greenhouse gas emission intensity of the farmland to be evaluated based on the farmland low-carbon technology; Determine the crop yield of the farmland to be evaluated; Comprehensively evaluate the carbon reduction measures of the farmland to be evaluated using the net emission intensity and crop yield; The determination of the net greenhouse gas emission intensity of the farmland to be evaluated includes: Determine the soil bulk density, soil layer thickness and soil organic carbon content of the farmland to be evaluated; Determine the soil organic carbon storage of the farmland to be evaluated based on the soil bulk density, soil layer thickness and soil organic carbon content; determining a soil organic carbon change rate based on the soil organic carbon stock; The total amount of greenhouse gas emissions from farmland was calculated; The crop yield is calculated based on the crop yield per unit area and the crop harvest area of ​​the farmland to be evaluated; The net greenhouse gas emissions from farmland are calculated based on the total greenhouse gas emissions from farmland and the rate of change of organic carbon; The net emission intensity of greenhouse gases from farmland is calculated based on the net greenhouse gas emissions from farmland; The calculation formula for soil organic carbon storage is: SOCS = SOC × ρ × H × 100; Among them, SOCS is soil organic carbon storage, ρ soil bulk density, and H is soil layer thickness; The calculation formula of the organic carbon change rate is: Among them, SOCS final is the soil organic carbon stock at the end of the experiment, SOCS initial is the soil organic carbon stock at the beginning of the experiment.

2. The method for evaluating the effect of low-carbon technology for farmland according to claim 1, characterized in that: The calculation formula for the total amount of greenhouse gas emissions from farmland is: GHG=CO2×1+CH4×27.9+N2O×273; Among them, GHG is the total greenhouse gas emissions from farmland, CO2 is carbon dioxide, CH4 is methane, and N2O is nitrous oxide.

3. The method for evaluating the effect of low-carbon technology for farmland according to claim 2, characterized in that: The calculation formula for the net greenhouse gas emissions from farmland is: Among them, Net GHG is the net greenhouse gas emissions from farmland.

4. The method for evaluating the effect of low-carbon technology for farmland according to claim 3, characterized in that: The calculation formula for the net greenhouse gas emission intensity of farmland is: Among them, Net GHGI is the net emission intensity of greenhouse gases from farmland.

5. A system device for evaluating the effect of low-carbon technology on farmland, used to implement the method as described in any one of claims 1 to 4, characterized in that: The device comprises: A first data determination module is used to determine the net emission intensity of greenhouse gases of the farmland to be evaluated according to the farmland low-carbon technology; The second data determination module is used to determine the crop yield of the farmland to be evaluated; The evaluation module is used to comprehensively evaluate the carbon reduction measures of the farmland to be evaluated by using the net emission intensity and the crop yield.

6. A system for evaluating the effect of low-carbon technology on farmland, characterized in that: include: at least one processing unit; and at least one memory and bus connected to the processing unit; The processing unit and the memory communicate with each other via the bus; the processing unit is used to call program instructions in the memory to execute any method described in claims 1-4.

7. A readable storage medium for evaluating the effect of low-carbon technology on farmland, on which a computer program is stored, characterized in that: include: When the computer program is executed by a processor, the steps in the method for evaluating the effect of low-carbon technology for farmland as described in any one of claims 1 to 4 are implemented.

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