Spatiotemporal evolution characteristics and contributing factors of the carbon effect in cultivated land use in Xinjiang
Using agricultural data from Xinjiang from 1991 to 2021,this study examined the temporal variations in carbon effects induced by cultivation in the region by using the carbon absorption and emission coefficient method.The spatial correlation,distribution,and evolution patterns of these carbon effects were explored by inte-grating Moran's I,centroid migration,and the standard deviational elliptical model.The aim of this paper was to investigate the spatiotemporal dynamics of carbon effect changes in cultivated land over a long-term series in Xin-jiang and to assess the region's potential for carbon sequestration.The results were as follows:(1)Carbon absorp-tion in Xinjiang's cultivated land significantly exceeded carbon emissions,demonstrating a net carbon sink ef-fect.Furthermore,the carbon sink capacity had consistently increased,rising from 8.3 million tons in 1991 to 34.29 million tons in 2021.(2)Regions with strong carbon sink capacity were concentrated in areas with exten-sive cultivated land and high production of corn,wheat,and cotton.(3)The net carbon sink of cultivated land ex-hibits significant spatial agglomeration patterns at the county and city scales,with the center of gravity of crop-land carbon sinks generally migrating to the northeast.However,over the past 30 years,it has remained situated in the Aksu region of southern Xinjiang.(4)Cropland carbon sinks are primarily attributed to carbon absorption by cotton,wheat,and corn.Conversely,the main sources of carbon emissions include the application of chemical fertilizers,farmland tillage,irrigation,and the use of agricultural films.Notably,the contribution of chemical fer-tilizers and agricultural films to carbon emissions is on the rise.Based on these findings,we propose an appropri-ate expansion of the cultivated land area and increasing the cultivation of cotton,as well as grain and oil crops in southern Xinjiang.Additionally,we should promote the planting of corn and cotton in accordance with local con-ditions and boost the investment in green agricultural technologies and materials to improve the production capac-ity of cultivated land,ensure food security,and enhance carbon sequestration.
cultivated land use in Xinjiangcarbon sources/sinks effectMoran's indexstandard deviation el-lipsecenter of gravity migration trajectory modelspatio-temporal evolution characteristic
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