基于土地利用变化的岳阳市碳排放时空格局研究

Spatial and Temporal Pattern of Carbon Emissions in Yueyang City Based on Land Use Change

研究市域土地利用碳排放时空格局,对于指导区域实现碳中和目标具有重要的意义。因此,基于岳阳市2013—2019年的土地利用数据和能源消耗数据,结合重心转移模型、ArcGIS空间分析等方法,对岳阳市的土地利用碳排放时空格局特征进行了分析。研究结果表明:岳阳市的土地利用类型以林地和耕地为主,建设用地面积呈现出增加的变化趋势,土地利用的净碳排放量由2013年至2019年增加了4.05%,其中建设用地的碳排放是岳阳市最主要的碳源,林地对碳汇的贡献量最大,同时总土地利用碳排放强度呈现出先减少后增加的变化趋势;岳阳市土地利用类型转移呈现出一转多的特征,土地利用碳排放总量和碳排放强度重心均集中在岳阳县,整体上均向东南方向转移,转移距离分别为2.96 km和16.15 km;2013—2019年岳阳市主要的土地利用变化引起的碳效应表现为碳排放增量高于碳吸收增量5168294.63 t,且建设用地侵占耕地、林地是碳排放总量大量增加的主要原因,此外林地带来的生态效益较为显著,在平衡碳循环中发挥着重要作用。

The spatial and temporal pattern of carbon emissions from urban land use is essential for the realization of the regional carbon neutrality.Therefore,based on the land use data and energy consumption data of Yueyang city from 2013 to 2019,an analysis has been made of the spatio-temporal pattern characteristics of carbon emissions from land use by using the gravity center transfer model,with ArcGIS spatial analysis combined together.The results show that the land use in Yueyang city is mainly characterized with woodland and cultivated land,with the construction land area in increase;net carbon emissions from land use has increased by 4.05%from 2013 to 2019,among which the carbon emissions from construction land were the most important carbon source in Yueyang city,while the forest land contributes the most to carbon sink.Meanwhile,the total carbon emission intensity of land use shows a trend of an initial decreasing and a subsequent increasing feature.The land use types in Yueyang City is characterized with a single-to-multiple transfer feature.The total carbon emission and carbon emission intensity of land use are concentrated in Yueyang County,which are transferred to the southeast as a whole,with transfer distances of 2.96 km and 16.15 km respectively;the carbon effect brought about by the main land use change in Yueyang City from 2013 to 2019 is that the carbon emission increment is higher than the carbon absorption increment of 5168294.63 tons,with the occupation of cultivated land and forest land by construction land being the main reason for the significant increase of total carbon emission.In addition,forest land brings significant ecological benefits,thus playing an important role in keeping the carbon cycle in good balance.