中国岩溶2011，Vol.30Issue(4)：383-390,8.
斯特石漠化综合治理区表层土壤有机碳时空动态特征与趋势探讨
Spatial-temporal dynamic features and tendency of the topsoil organic carbon in integrated rehabilitating karst rocky desert
摘要
Abstract
Taking the Guizhou Province, a representative karst area, for example, three typical demonstration areas for integrated rehabilitation to karst rocky desertification is chosen in the study. Based on the field monitored data in April 2006 and repeated sampling data in April 2009, the spatial-temporal dynamic characteristics of the topsoil in fragile environment under integrated rehabilitating is analyzed. The result proves the following items. After 3 years rehabilitation, the increase in topsoil organic carbon density at different plots of different desertification grades is different with each other. The amount of the increase in topsoil organic carbon density at mild and moderate rocky desertification plots is the largest, inconspicuous or potential rocky desertification plots is the second, and the serious rocky desertification is the smallest. Organic carbon density of the topsoil under different engineering measures manifests as: closed treatment > recovering farmland to forests and grassland > the project of transforming slope to terrace. While the growth manifests as: recovering farmland to forests and grassland > closed treatment > the project of transforming slope to terrace. Along with the decreases in land area of mild rocky desertification grade or more seriously desertification grade, the carbon storage of the topsoil increases further, and the carbon storage of the topsoil mainly exists in potential rocky desertification plot or not deserted region. The growth trend of topsoil organic carbon density perhaps presents the "S" pattern along with the rehabilitation, but the organic carbon density of topsoil in inconspicuous and potential rocky desertification plots will keep steady state in a long time for those lands are the basic farmland generally. At the mild and moderate rocky desertification plots, the increase in topsoil organic carbon density is the largest in early rehabilitation stage. So take effective methods of land use and strengthen sustainable management is of extremely vital significance in improving the carbon sequestration.关键词
土壤有机碳/密度/碳储量/喀斯特石漠化Key words
soil organic carbon/ density/ carbon storage/ karst rocky desertification分类
农业科技引用本文复制引用
熊康宁,周文龙,龙健,罗井升..斯特石漠化综合治理区表层土壤有机碳时空动态特征与趋势探讨[J].中国岩溶,2011,30(4):383-390,8.基金项目
贵州省科技计划课题"贵州喀斯特石漠化生态系统综合整治技术与模式的研究与示范"(黔科合S字[2007]1061号)、国家自然科学基金"喀斯特地区石漠化过程土壤微生物生态特征及响应机制"(40971160) （黔科合S字[2007]1061号）
