江苏省区域不同土地利用方式的碳排放效应分析

Effects of land use patterns on carbon emission in Jiangsu Province

土地利用是造成碳排放的主要原因,为了分析土地利用方式的碳排放效应,以江苏省为例,分别计算并分析了1995～2004年间这一工业化、城市化快速发展时期,江苏省主要土地利用方式的碳排放。结果表明,建设用地和耕地是主要碳源,建设用地碳排放每年可达1.09×108t,对碳排放的贡献高达96%以上;耕地每年碳排放可达2.02×106t;林地为主要的碳汇,其总吸收量约为每年1.90×103t(含少量草地)。从土地利用变化的边际碳源/汇效应来看,江苏省建设用地面积每变化1km2,其边际碳源/汇效应为6.7692t;耕地为0.0422t;林地为5.7700t。同时对江苏省2010年不同土地利用方式的碳排放进行了预测,结果显示到2010年江苏省碳排放会有明显增加,面临的碳减排任务十分严峻。依据相关分析结果,论文从碳减排角度提出了土地利用的相关政策建议,并提出了有待进一步研究的相关问题。

Land use is one of the most mainly factors that causing the carbon emission.In order to analyze the effects of land use pattern on carbon emission,using data from Jiangsu Province,the authors calculated the carbon emission which is influenced by different land use patterns.The results indicated that carbon emission is significantly diverse according to different land use patterns,in which the construction land and cultivated land are the two main carbon sources.They emit carbon 1.09×10 8 t and 2.02×10 6 t separately per year.Forest land and grassland are the two main carbon sink which imbibe carbon about 1.90×103t together per year.Considering the land use changes,carbon emission will increase 6.7692 t while the construction land increases 1 km 2 ,0.0422 t increase for cultivated land and 5.77 t reduction for forest land.Some forecasts were made to indicate the carbon emission influenced by different land use patterns in 2010.The results show a great increase in carbon emission and it is severe to reduce the carbon emission.At last,some suggestions are put forward for further effort to reduce carbon emission.