CARBON SINK AND CARBON FOOTPRINT CHANGE OF CULTIVATED LAND USE IN JIANGJIN DISTRICT AT THE END OF THREE GORGES RESERVOIR IN RECENT 24 YEARS
The global warming caused by the growth of carbon emissions is receiving increasing attention from all walks of life.As the carrier of carbon source and carbon sink,it is extremely important to analyze the evolution characteristics of carbon emissions of cultivated land.Based on the data of cultivated land use and agricultural data of Jiangjin district from 1997 to 2020,this paper measured the carbon absorption during crop fertility and carbon emissions during production.The results were showed as follows.(1)The carbon emissions,carbon absorption and carbon sink of cultivated land use in Jiangjin district all showed an increasing trend.Compared to 1997,the carbon emissions increased by 34,600 t,up to 86.86％,and the carbon emission intensity increased by 91.18％.The main carbon sources were agricultural fertilizer application and agricultural film use.(2)Carbon absorption increased by 50,300 t,with an increase of 27.31％,and carbon absorption intensity increased by 30.78％.Vegetables,rice and other food crops contributed the most to carbon absorption.The reason why carbon sink values were all positive was that carbon absorption was much greater than carbon emissions,with an increase of 26％compared to 1997,and carbon sink intensity had increased by 29.50％.Compared to 1997,both the carbon footprint and unit area carbon footprint showed an increasing trend,with an increase of 0.11 million hm2(42.31％)in carbon footprint and 0.011 hm2(45.45％)in unit area carbon footprint.Finally,it concludes that the net carbon footprint values are all negative over the past 24 years,indicating that the utilization of cultivated land in Jiangjin district is in a carbon ecological surplus state.
万方数据
维普
