Analysis On The Changing Trend And Driving Factors Of Net Carbon Emission From Farmland Utilization In Hunan Province

China is a large agricultural country,in the process of agricultural modernization transformation,China’s agricultural land use leads to the increase in net carbon emissions.So the research on five factors,net carbon emissions,energy consumption,production value,production,land use,provides important basis for carbon reduction in China’s agriculture.Based on the perspective of agricultural land use,this thesis analyzes the trend and EKC inspection results of net carbon emission in Hunan province,Changsha-Zhuzhou-Xiangtan City Group,Dongting Lake Ecological Economic Zone,Southern Hunan Region,and Western Hunan Region.Combined with the extended KAYA identity,this thesis provides an in-depth analysis of the driving factors of net carbon emissions and gives suggestions.The main conclusions are as follows:(1)From 2008 to 2019,net carbon emissions from agricultural land use in Hunan Province changed obviously,showing a trend of decreasing first and then increasing,and decreasing slightly from-27.1231 million t to-28.629 million t on the whole.The variation trends of net carbon emissions from agricultural land use were significantly different among the four sectors in Hunan Province.Net carbon emissions from agricultural land use,increased from-4.1048 million t up to-3.5078 million t in Changsha-Zhuzhou-Xiangtan city group,increased from-8.1781 million t up to-8.4854 million t in Dongting Lake Ecological Economic Zone,decreased from-6.4796 million t down to-7.3598 million t in southern Hunan,decreased from-8.3607 million t down to-9.2760 million t in western Hunan.In short,the spatial distribution of net carbon emissions from agricultural land use in Hunan Province is roughly "high in the southeast and low in the northwest".Combined with the calculation and analysis,farmland and woodland are the main types influencing net carbon emissions from land use.(2)In Changsha-Zhuzhou-Xiangtan city group,there is a U-shaped EKC relationship between net carbon emissions from agricultural land use and its corresponding output value;Net carbon emission from farmland has a positive linear relationship with its corresponding output value.There is an "N-type" EKC relationship between net carbon emissions from woodland and its corresponding output value.There is an "inverted U-shaped" EKC relationship between net carbon emissions from gardens and water areas and their corresponding output values;In Dongting Lake Ecological Economic Zone,there is a U-shaped EKC relationship between net carbon emissions of agricultural land and farmland and their corresponding output values;And there is an "inverted U-shaped" EKC relationship between net carbon emissions of woodland,water area and their corresponding output values;Net carbon emissions from gardens have a positive linear relationship with its corresponding output value;In southern Hunan,there is an "inverted U-shaped" EKC relationship between net carbon emissions from agricultural land use and its corresponding output value;There is a negative linear relationship between net carbon emissions of farmland and its corresponding output value;There is an “inverted U-shaped” EKC relationship between net carbon emissions from woodlands,garden lands,grasslands and water areas and their corresponding output values.In western Hunan,there is a "U-shaped" EKC relationship between net carbon emissions of agricultural land,farmland and their corresponding output values.There is a positive linear relationship between net carbon emissions from woodland and its corresponding output value.There is an "inverted U-shaped" EKC relationship between net carbon emissions from gardens and water areas and their corresponding output values.(3)For the utilization of natural resources and agricultural land in different sectors,obvious spatial differences exist in the contribution values of energy consumption per unit output value,net carbon emission per unit energy consumption,output value per unit,output value per unit land,and land scale.Net carbon emission per unit of energy consumption,is the major factor affecting net carbon emission of agricultural land use in Changsha-Zhuzhou-Xiangtan city group,and the main factor improving net carbon emission in Dongting Lake Ecological Economic Zone.Energy consumption per unit output value and land output per unit are main factors that promote net carbon emission in southern Hunan.Energy consumption per unit output value is the major factor that promotes net carbon emission in western Hunan.In summary,output per unit is the primary inhibiting factor in the four sectors.(4)Finally,in this paper,it is believed that important measures,such as improving energy utilization efficiency,improving rural agricultural production conditions,bettering agricultural energy consumption structure,developing ecological and low carbon agricultural economy and so on,should be taken to reduce net carbon emissions from agricultural land use in Hunan Province.