Study On Carbon Reduction Potential And Realization Mechanism Of Agricultural Land Use In China

Carbon function of agricultural land use can be divided into carbon sink and carbon emissions.Carbon emissions from agricultural land use which aggravate a series of environmental problems such as global warming as the main undesired output in the process of Agricultural Economic Development.In 2019,Document No.1 of the Central Committee explicitly put forward the need to "expand the pilot system of rotation farming","expand the conversion of farmland to forestry and grassland" and "implement a new round of grassland ecological protection incentive policy".It can be seen that optimizing the structure of agricultural land use plays an important role in protecting the ecological environment and forming the spatial pattern of saving resources and protecting the environment.However,the implementation of carbon reduction policies for agricultural land use in different regions will result in different levels of carbon emission reduction costs for agricultural land use.The effect of emission reduction can not be obtained at the expense of higher cost.Therefore,it is necessary to share the reduction responsibility of different provinces according to the ability of using agricultural land to reduce emissions in different provinces.How to scientific and reasonable allocation of carbon emission reduction task,has become an urgent issue of our government and academia.This paper first analyzes the current situation and spatial-temporal characteristics of the carbon effect of agricultural land use in China,and further explores the current situation and evolution trend of net carbon emissions from agricultural land use by using the Kernel density estimation model.Secondly,through the Super-SBM Dual Model,the shadow price of farmland utilization in each province(district and city)is compared.Finally,according to the equity and efficiency index of farmland utilization carbon emission reduction,and according to different principles,the carbon emission reduction potential index of farmland utilization carbon emission reduction is obtained,which provides a reliable basis for the assignment of farmland utilization carbon emission reduction task.On the one hand,the investigation and monitoring of carbon emissions in China is conducive to the achievement of carbon emission reduction targets in China.On the other hand,it provides a scientific basis for the formulation of relevant policies on carbon emission reduction in agricultural land use.Firstly,in terms of carbon emissions from agricultural land use,the annual increasing rates of total and intensity carbon emissions from 1993 to 2016 in China were 3.47% and 1.83%,respectively.The total carbon emissions from the traditional agricultural provinces in the central and eastern China are generally high,and the intensity of carbon emissions from agricultural land use is higher in the economically developed provinces and the central China.In terms of carbon sinks in agricultural land use,the growth rate of forestland carbon sinks in 1993-2016 experienced a process of "first rising and then decreasing",and grassland carbon sinks decreased year by year.Rich carbon sinks of grassland and woodland in the western and northeast ChinaSecondly,from the point of view of current situation,the growth rate of carbon emissions from farmland use is much faster than that of carbon sinks,and the net carbon sequestration amount of agricultural land use is reduced as a whole.According to the trend of dynamic evolution,the regional differences of net carbon emissions from agricultural land use in China are becoming smaller and smaller,and the total net carbon emissions increase.Thirdly,from 2000 to 2016,the carbon emission reduction costs of agricultural land use showed a trend of "first rising and then decreasing",the highest was in Sichuan and the lowest was in Ningxia,and there was a big difference in the reduction of carbon emissions from agricultural land use to local areas.Based on the differences in fairness and efficiency,there are four categories in the 29 provinces.Beijing and other provinces belong to the "high-high" type,Inner Mongolia and other provinces belong to the "high-low" type,Henan and other provinces belongs to "low-high" type,Shanxi and other provinces belong to "low-low" type.Finally,different preference on the principle of equity or efficiency leads to the regional difference on the mechanism of liability-sharing of carbon reduction.However,Beijing,Tianjin and Zhejiang ranked in the top five under different principles,while Sichuan,Guizhou,Yunnan and Gansu ranked in the top five respectively.