The Research On Greenhouse Gas Emission Efficience Of Planting Industry Based On SBM Model

At the 2015 Paris Climate Summit,China proposed to reach the peak of carbon emissions around 2030,and strive to reach as soon as possible,the carbon emission intensity of domestic unit GDP in 2030 decreased by 60% to 65% compared with 2005.In fact,the crop industry is one of the major sources of greenhouse gases in China,and the carbon emissions generated by its production process account for about 48.41% of the total agricultural carbon emissions.How to improve carbon emission efficiency and effectively reduce carbon emissions in crop production under the premise of ensuring food security is of great significance.This paper estimates the carbon emissions of crops in 31 provinces of China,and explores the differences in carbon emission efficiency between China’s inter-provincial crops through the construction of DEA-SBM models based on undesired outputs.Provide reference for relevant government departments in China to issue emission reduction strategies that are consistent with the actual situation of China’s planting industry.The main findings are as follows:(1)From 1991 to 2015,the total carbon emissions of crops in China showed a volatility trend as a whole,from 297.06 million tCO2-eq in 1991 to 333.89 million tCO2-eq of CO2-eq in 2015,an increase of 12.40%.The average growth rate is about 0.50%.During the research period,China’s crop carbon emissions gradually changed from paddy field methane to land use.At the regional level,the Central South region is the main region for carbon emissions in China’s crop production industry,followed by East China,Southwest China,Northeast China,and North China,with the lowest carbon emissions in the Northwest.At the provincial scale,the carbon emissions of crops in different provinces in China are quite different,and the total carbon emissions show a slow upward trend;The overall carbon emission intensity shows a trend of decreasing year by year.(2)During the research period,the carbon emission efficiency of most provinces in China showed a trend of continuous growth,and its change trend was basically consistent with the technical efficiency.In general,most provinces have higher carbon emission efficiency than technical efficiency.The minimum carbon emissions from planting in various provinces in China are basically consistent with the changes in actual carbon emissions.The emission redundancy of planting industry in each province is opposite to the technical efficiency.In areas with high technical efficiency,the carbon emission redundancy is relatively low.(3)By dividing the carbon emissions and carbon emission efficiency of 31 provinces in China: only half of the provinces are low-emission-high efficiency;Jiangsu,Guangdong,Sichuan,and Hubei are high-emission-high-efficiency;Inner Mongolia,Chongqing,Jilin,Yunnan,and Liaoning are low-emission-low-efficiency;Anhui,Guangxi,Hunan,and Jiangxi are high-emissions-low-efficiency.(4)The convergence results show that the inter-provincial planting carbon emissions are significantly different from the technical efficiency and carbon emission efficiency,and the carbon emissions show σ convergence during the study period;The coefficient of variation of planting technical efficiency and carbon emission efficiency is not much different,and the trends of the two are basically the same.That is,with 2005 as the watershed,the coefficient of variation fluctuated in 1991-2005,and there was σ convergence,while it rose slowly in 2006-2015,showing a divergent situation.