滁州市陆地生态系统土壤碳储量对土地利用变化响应

A Research On the Response of Terrestrial Ecosystem's SOC Storage to Land Use Change in Chuzhou

从土地利用变化造成的非建设用地土壤有机碳储量变化,及土壤有机碳储量对土地利用变化脆弱性评估两个角度,研究2005-2013年滁州市陆地生态系统土壤碳储量对土地利用变化响应。研究发现:(1)土地利用强度逐年增加,土地利用变化主要表现为耕地、林地、水域、建设用地的增加和其他用地的大幅减少。建设占用导致大量农用地发生非农转用,耕地保护形势日趋严峻。(2)2005、2009、2013年,滁州市非建设用地的中层土壤有机碳储量为13090.11t、12538.86t和12500.05t,呈现先快后慢的减少态势,这主要受草地碳储量减少速率影响;耕地、林地和水域的储碳量最高。(3)2005-2013年,土地利用变化对非建设用地土壤有机碳储量的潜在影响指数为-2.05,前后4年潜在影响逐渐降低,脆弱程度有所改善,但仍不理想,土地利用有待向更加低碳的模式转变。

Through the analysis of the variations of soil organic carbon reserves, caused by land use change, and vulnerability of soil organic carbon reserves to land use change, we studied how the soil organic carbon reserves response to land use change, in Chuzhou City, from 2005 to 2013. Research conclusions embodied in the following three aspects： （1） in the same of construction land, the scale of cultivated land, forest land and water area ware increased in the past 8 years, but the others was sharply redu.ced. A large number of agricultural land was transformed into land for construction purposes, the situation of cultivated land protection was increasingly serious. （2） Chuzhou＇s soil organic carbon storage, in the year of 2005, 2009 and 2013, is 13090.11t, 12538.86t and 12500.05t respectively. Mainly influenced by the reducing rate of grassland＇s carbon reserve, the SOC storage has gradually reduced, with a hige speed in the early 4 years and low speed in the late 4 years. With respect to carbon storage, the top three land types ware cultivated land, forest land and waters respectively. （3） From 2005 to 2013, the potential impact index of land use change to SOC storage was -2,05, and the index has gradually increased in the late 4 years. The vulnerability of soil organic carbon reserves to land use change has became better, but not the best, the patterns of land use need to be more low-carbon.