Research On Carbon Effect Calculation And Decision Optimization Of Land Remediation Projects

With the socio-economic development and the improvement of industrialization,climate change has become the most serious and widespread global environmental problem today.Human activities such as fossil fuel combustion and land use change are the most direct carbon sources that cause greenhouse gas emissions.Land carries the production and life of human beings,and it is the unity of economic,social and ecological benefits.Land remediation,as an important part of land use activities,significantly affects the carbon cycle of the land ecosystem.In this context,it is particularly important to study the relationship between land remediation and carbon emissions.For a long time,land remediation has become an effective way to improve land use efficiency,optimize land use structure and layout,promote production and living conditions and ecological environment.However,at the same time,the construction of land improvement projects will also have a great impact on the regional carbon cycle and carbon pool reserves,which are mainly reflected in the carbon source effect and carbon sink effect.Consumption of engineering energy and materials leads to a gradual increase in carbon emissions.Changes in the land use structure lead to changes in the carbon storage in the project area.The carbon absorption capacity of crop production,agricultural planting patterns,and carbon emissions from agricultural production inputs will also affect carbon sink and carbon source effects.As the current carbon effect measurement system for land improvement projects is not mature enough to be optimized,it is of great significance to strengthen the in-depth study of the carbon effect of land improvement on the low-carbon land improvement in the later period:This study consulted a large number of relevant references and data,and integrated analysis of related research content and research progress.The land remediation project area in Leping City,Jiangxi Province was taken as the research object,based on the theory of terrestrial ecosystem carbon cycle,sustainable development theory and low carbon.Agricultural theory,starting from the three aspects of engineering construction,land use structure change and farmland ecosystem management before and after land remediation in the project area,measures and analyzes the carbon effect in the study area.Based on the analysis of the carbon effect calculation results,based on the ISM model,put forward reasonable countermeasures to strengthen low-carbon land management and make decision optimization studies.And drawing the following conclusions:(1)In terms of engineering construction,field road engineering in the project area consumes the largest amount of carbon emissions.Irrigation and drainage engineering is the project that uses the most energy and materials.The amount of engineering is large and complicated.From the perspective of energy and materials consumed by the project,a large amount of machinery is required,so diesel is the largest energy consumption,and land use projects use the largest amount of diesel.Due to the construction of trenches,culverts or on-site preparation of irrigation and water conservancy facilities and field roads during construction,cement is the largest material consumption.The project does not involve farmland protection forest projects,so the construction of the project is mainly based on carbon emissions,which manifests itself as a carbon source effect.(2)In terms of land use structure,the project area is mainly reflected in the continuous increase in the area of cultivated land after land remediation,the increase in the area of paddy fields and dry land,the decrease in the area of garden land,forest land,grassland and water conservancy facilities.The area of rural roads increased after land remediation.This leads to changes in vegetation and soil carbon storage corresponding to land use patterns in the project area.Finally,it was calculated that the carbon storage increased by 159.707 t after land remediation in the project area,indicating that the land remediation increased the carbon storage in the project area,which was manifested as a carbon sink effect.(3)In terms of farmland management,the crop yield and total carbon absorption after land remediation are all in a growing trend,and the planting model has also changed from a single model to a combination of single and multiple planting models.Farmland farming will also be accompanied by carbon emissions.Agricultural inputs such as pesticides,agricultural films,fertilizers,agricultural machinery and irrigation will cause the total carbon emissions of farmland ecosystems to increase.By analyzing the application of pesticides and fertilizers,carbon emissions from farmland farming will be main reason.(4)The ISM model can clarify complex factor problems,and hierarchically decompose low-carbonization measures for land remediation.It can divide the surface,middle,direct,and most fundamental measures of the problem,so as to make decisions and optimize the carbon effect measures for land remediation.Putting forward countermeasures and suggestions that are suitable for low-carbon development in the remediation area will help to improve the carbon sink effect in the remediation area.