Study On Non-agricultural Carbon Sequestration Loss And Carbon Benefit Of Agricultural Land Conversion

Since the industrial revolution,the non-agriculturalization of agricultural land has spread rapidly in China and the world.The non-agriculturalization of agricultural land has not only changed the balance of the original carbon cycle,but also accompanied by a series of ecological and environmental problems.China is facing the contradiction between urban expansion,cultivated land protection and ecological environment.The problems between “Green Mountain Green Mountain” and “Jinshan Silver Mountain” have become increasingly prominent.Faced with the emission reduction targets proposed by the State Council,emission reduction and efficiency increase are imminent.Therefore,studying the non-agricultural carbon sink loss and carbon benefit of agricultural land can better reveal the ecological cost behind economic development and the ecological feedback benefit of land cover change.The Chengdu-Mianyang-Leshan Economic Development Zone is a hot spot for economic development in Sichuan Province.The nonagriculturalization of agricultural land is fierce,and urban expansion has exerted tremendous pressure on cultivated land and environmental protection.In view of the fact that this paper takes 51 counties(cities,districts)in the economic development zone of Chengdu-Mianyang-Leshan as the research object,based on the analysis of the temporal and spatial evolution characteristics of non-agriculturalization of agricultural land,the model is used to estimate the non-agricultural carbon sink loss and carbon benefit of agricultural land.And analyze its dynamic evolution of time and space,using the geo-detector model to measure the influence and dynamic changes of the factors affecting carbon efficiency.Finally,combined with the carbon loss and carbon benefit matching situation and the relationship between the two,the status quo of agricultural non-agricultural low-carbon development and the possibility of emission reduction are analyzed,and the potential zoning is carried out.Based on this,combined recommendations are put forward in combination with the regional development status.Through research,this paper mainly draws the following conclusions:(1)In 2002-2016,the process of non-agriculturalization of agricultural land in the study area was rapid,showing strong stage and volatility characteristics,and regional differences were obvious.Among them,dryland and grassland were the most serious non-agriculturalization.During the study period,the non-agriculturalization of agricultural land showed the characteristics of fluctuation reduction,and it was distributed in space,and the spatial differentiation was significant.Cultivated land and grassland are the most important non-agricultural agricultural land.The transfer path of non-agricultural gravity in dry land and paddy fields is consistent,and the path of non-agricultural gravity transfer in grassland and woodland is completely opposite.(2)In 2002-2016,the carbon sink loss in the study area generally showed the pattern of “rise-low-stable” stability,and the spatial distribution showed high distribution in the middle,low and south,and the loss of carbon sinks in dry land and grassland was the most.The carbon sink loss shows the law of “rise-lower-stable”.At the same time,the spatial difference of carbon sink loss in the study area is significant,showing a low spatial distribution pattern between the north and the north.During the period,grassland and dryland carbon loss were the most and the contribution rate continued to be high.It was the main “carbon sink” land.(3)In 2002-2016,the carbon benefit in the study area continued to rise,the regional differences were large and the trend was reduced,and the spatial distribution showed the characteristics of decreasing from the central to the north and south.The economic factors had the greatest impact on carbon efficiency.The carbon income value increased from the initial stage of 1,962,400 yuan / ppm to the final stage of 34,818,800 yuan / ppm,an increase of 16.69 times compared with the initial period,showing a continuous rise.Its spatial distribution shows a decreasing pattern from the central to the north and south.The gap between Chengdu and other prefecture-level cities,between county and city jurisdictions is large and shrinking.The impact factor is relatively stable with new general budget revenue and total sales of new retail products,indicating that the economic development trend has a greater impact on carbon revenue and is extremely stable.(4)Based on the analysis of carbon sink loss and carbon benefit matching status and correlation model,combined with the actual development of the region,the Mianle Economic Development Zone will be divided into three potential zones.Combined with the carbon sink loss and carbon benefit matching status and the correlation model between the two,it is known that the low loss and low benefit area and the high loss and low benefit area are the main areas in the study area.Finally,the study area is divided into low-potential areas,medium-potential areas and high-potential areas in combination with regional development status,and targeted emission reduction path recommendations are proposed.