大别山区生态系统碳储量时空变化特征
Spatiotemporal variation characteristics of carbon storage in Dabie Mountain Area Ecosystem
研究大别山区的土地利用类型变化同碳储量之间的时空变化关系,对区域生态系统保护及碳储功能的可持续发展具有重要意义,基于2000—2020年大别山区的土地覆盖遥感数据,从年变化率、动态度和转移矩阵三个方面分析大别山区不同生态系统类型的时空变化;运用InVEST模型,探究过去二十年间碳储量变化.结果表明:(1)2000—2020年,耕地面积的缩减幅度加大和城乡、工矿、居民用地的扩张幅度加剧,大别山区流域动态度(LC值)为0.13%;“耕地”主要转为“城乡、工矿、居民用地”.(2)2000、2010、2020年,大别山区生态系统总碳储量分别为24540.06、24504.99、24368.2万t;二十年间碳储量减少了171.86万t,后十年减少的幅度增大.(3)碳储量的变化主要是土地利用类型变化引起,碳密度高的耕地和林地转向碳密度较低的城乡、工矿、居民用地,这是总碳储量减少的主要原因.
Study of the spatio-temporal variation relations between the land use change and the carbon storage in Dabie Mountain Area is important for the protection of regional ecosystem and the sustainable development of carbon storage. Based on the remote sensing data of land cover in Dabie Mountain Area from 2000 to 2020, the temporal and spatial changes of different ecosystem was analyzed from three aspects: annual change rate,dynamic degree, and transfer matrix. The main carbon storage changes in the past 20 years were investigated with InVEST model. The results showed that:(1) The cultivated area continued to decrease from 2000 to 2020,while the industrial and mining land for urban and rural residents increased rapidly. The ecosystem dynamic change index (LC value) of the whole Dabie Mountain Area was 0.13 percent. The cultivated land was mainly converted into the industrial and mining land for urban and rural residents. (2) The carbon storage in 2000, 2010 and 2020 in the research area was 24540.06×104 t, 24504.99×104 t, 24368.2×104 t respectively. Over the past two decades, the carbon storage had reduced 171.86×104 t,with a much higher magnitude decrease in the second decade. (3) The transformation of land use pattern was the primary cause of the variation of the carbon storage. The decrease of the carbon storage was mainly due to a shift from the high carbon-intensive cropland and forestland to the low carbon-intensive industrial and mining land in urban and rural residents.
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安徽省自然科学基金资助项目(2008OD173)
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