Spatio-temporal Evolution Characteristics of Carbon Source/Sink for Cultivated Land Use at County Level in the Three Gorges Reservoir Area(Chongqing Section)in Recent 20 years
carbon status of cultivated land is not only of great significance for sustainable agriculture development and achieving carbon peaking and carbon neutrality goals of our country,but also reflects the degree of agricultural influence on ecology.Based on the agricultural data and cultivated land data from the districts in the Three Gorges Reservoir area(Chongqing Section),the spatio-temporal evolution of the carbon status of cultivated land utilization was studied.The results showed that:(1)From the perspective of time,the carbon absorption of cultivated land in the reservoir area increased by 8.1815 million tons from 2000 to 2020,an increase of 62.68％he carbon absorption ratio of vegetables and grain crops was the largest;In the past 21 years,carbon emissions increased by 84,900 tons,15.23％.Fertilizer was the main contributor to carbon emissions,with an average annual carbon emission ratio of 57.22％.There a carbon ecological surplus in the cultivated land utilization in the reservoir area for 21 years,and the carbon footprint and the carbon footprint per unit area continuously decreas,and the carbon footprint ecreased by 44.72％.(2)From spatial perspective the carbon emissions and carbon absorption of cultivated land utilizatin in the reservoir area were the southwest and low in the northeast,while the carbon footprint showed a pattern of high in the north and south and low in the middle,but the spatial differences and the range of change of the three were.The carbon sink function of cultivated land utilization in reservoir area generally increas.
carbon absorptioncarbon emissionscarbon neutralizationpeak carbon dioxide emissionsThree Gorges area
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NSTL
万方数据
