四川省广元市不同土地利用类型的碳排放效应研究

利用土地利用变化及能源消耗资料,采用直接碳排放系数法,对四川省广元市近20a的不同土地利用类型的碳排放效应进行了估算。结果表明,在土地利用变化的影响下,该区域碳排放量明显增加,从1990年的2.11×107 t增长到2010年的3.98×107 t,增长幅度为88.9%;建设用地是主要的碳源,碳排放量从1990年的2.73×107 t迅速增长到2010年的4.91×107 t,其碳排放量占总碳排放量的99%以上,平均年增长速度为1.09×106 t;林地作为最大的碳汇,20a间有所增长,但水域、草地、未利用地碳汇效益不明显;从碳排放的空间格局来看,市中心区利州区的碳排放量最大,年平均碳排放量1.60×107 t。依据相关研究结果,提出了减少广元市碳排放量的相关建议。

Effects of Different Land Use Patterns on Carbon Emission in Guangyuan City of Sichuan Province

The effects of land use on carbon emission in Guanyuan City are analyzed.Coefficients of carbon emission of land use were firstly summarized.According to the data of land use,energy consumption and carbon emission coefficients,carbon emission related to land use from 1990 to 2010 were then evaluated.Results are as follows:(1) carbon emission amount increased rapidly from 21 100 thousand tons in 1990 to 39 800 thousand tons in 2010;(2) construction land was a major carbon emission source,whose carbon emission increased from 27 300 thousand tons in 1990 to 49 100 thousand tons in 2010,accounting for about 99% of overall carbon emission;(3) woodland is a major carbon sink,absorbing much carbon from 1990 to 2010,while grassland,water and unused land do not possess carbon sink ability;(4) in terms of the spatial carbon emission pattern,Lizhou district,the center district of Guangyang City,had the biggest carbon emission amount as compared with other places,reaching 16 000 thousand tons per year.Based on relevant research results,some suggestions are presented for reducing carbon emission in Guangyuan City.