Research On The Spatiotemporal Pattern And Influencing Factors Of Net Carbon Sink In Agricultural Production In China’s Main Grain Producing Areas

During the "13th Five-Year Plan" period,my country’s green agricultural development has made great progress.Chemical fertilizers,pesticides,and agricultural films have achieved negative growth for four consecutive years.Due to the insufficient implementation of the green concept,the green development of agriculture is still extensive,resulting in the problem of climate warming.As a result,my country has put forward new requirements for low-carbon agricultural development during the "14th Five-Year Plan" period.The Ministry of Agriculture and Rural Affairs,the Ministry of Ecology and Environment and other five departments jointly issued the "14th Five-Year Plan for National Agricultural Green Development",proposing to strengthen the protection and utilization of agricultural resources,strengthen the prevention and control of agricultural pollution,strengthen the protection and restoration of agricultural ecology,and build a green and low-carbon agricultural industrial chain and other key tasks.Carbon emissions are an important factor causing global warming.The global greenhouse gas emissions from planting account for 30%of the global anthropogenic greenhouse gas emissions[1-4].Agricultural production also has the function of carbon source and carbon sink.In the process of carbon source and carbon sink in agricultural production,it is of great significance to identify existing problems and propose solutions in a targeted manner to ensure food production security and promote low-carbon agricultural production.Drawing on the existing relevant research,combined with the theories of sustainable agricultural development and low-carbon agriculture,the coefficient method was used to calculate the carbon source and carbon sink in the agricultural production process in the main grain producing areas,and the temporal and spatial evolution trend of the net carbon sink in agricultural production was analyzed.Finally,the LMDI model is used to decompose the influencing factors of the net carbon sink to explore the contribution of each influencing factor.The results show that:(1)In terms of carbon sources.In recent years,the input of agricultural materials has decreased,and the amount of carbon sources has also decreased,but it is still the main carbon source.The amount of carbon sources in the use of farmland is increasing year by year,and agricultural ploughing and irrigation will be the focus of rectification and emission reduction in agricultural production in major grain producing areas.Vegetables account for the largest carbon emissions among commercial crops,and the carbon emissions of other commercial crops other than vegetables decrease year by year,which can promote emission reduction and increase in sinks in major grain producing areas by improving vegetable planting technology.Among the provinces,in 2020,except for Heilongjiang,Jilin,Jiangsu and Jiangxi,the carbon sources of agricultural production increased compared with 2019,and the remaining 9 provinces all decreased.(2)Carbon sinks.In 2020,the carbon sink of grain crops accounted for 88.21%of the carbon sink of crops in the main grain producing areas.The carbon sink of corn continued to increase,while the carbon sink of the rest of the grain crops continued to decline.The reason may be that although rice,wheat and corn production are all rising,the increase in corn production is even greater.Among the provinces,Jilin’s agricultural production carbon sink has declined since 2017,mainly due to the decline in corn,sorghum and beans production.(3)Net carbon sink.The net carbon sink in agriculture in the main grain producing areas is on the rise as a whole.The change trend of the net carbon sink density is almost the same as the change trend of the net carbon sink.Further sacrifice agroecology to obtain the development of agricultural economy.From 2000 to 2020,Jiangxi’s agricultural net carbon sink was the least among the 13 provinces,mainly because the increase in rice planting area resulted in a significant increase in carbon sources,but the increase in carbon sinks was less than the increase in carbon sources.(4)Influence factors of net carbon sink.The agricultural production efficiency factor and the labor scale factor inhibited the growth of net carbon sinks,and the agricultural production efficiency factor inhibited more than the agricultural labor scale factor.The factors of agricultural industry structure and agricultural economic level have a promoting effect on the growth of the net carbon sink of agricultural production in the main grain producing areas.The promoting effect of the agricultural economic level factor is greater than that of the agricultural industrial structure factor,and is the main promoting factor.Finally,according to the research results,some countermeasures and suggestions are put forward to improve the way of farmland utilization,optimize the planting structure of crops,promote the integration of science and technology in agricultural production,and improve the green agricultural policy guarantee system.The district’s agricultural production emission reduction and foreign exchange increase have made a certain contribution.