贵州喀斯特石漠化过程中的土壤有机碳与容重关系  

Relationship between Soil Organic Carbon and Bulk Density in the Rocky Desertification Process of Karst Ecosystem in Guizhou

作　　者：闫俊华[1] 周传艳 文安邦[3] 刘兴诏[1,4] 褚国伟[1] 李坤[1,4] 

机构地区：[1]中国科学院华南植物园,广州510650 [2]贵州省喀斯特资源环境与发展研究中心,贵阳550001 [3]中国科学院水利部成都山地灾害与环境研究所,成都610041 [4]中国科学院研究生院,北京100049

出　　处：《热带亚热带植物学报》2011年第3期273-278,共6页Journal of Tropical and Subtropical Botany

基　　金：国家科技支撑计划项目(2008BAD98B01)资助

摘　　要：测定了不同石漠化等级的西南喀斯特生态系统的土壤容重和土壤有机碳。结果表明:西南喀斯特生态系统的土壤容重为0.91～1.37 kg cm-3,土壤有机碳含量变化较大,为8.1～58.9 g kg-1。在0～40 cm的土层中,没有发生石漠化的生态系统的有机碳储量达16.91 kg m-2,伴随着石漠化程度的加剧,土壤有机碳储量急剧下降,极度退化土壤的有机碳储量只有0.52 kg m-2。在1999-2005年间,中国西南石漠化(约55×104km2)导致的有机碳流失通量年增加量超过28 Tg。同时,探讨了喀斯特石漠化过程中土壤有机碳流失的去向,喀斯特石漠化过程土壤有机碳对生态恢复的限制作用,利用土壤容重推算土壤有机碳的可靠性。The relationship between soil bulk density and soil orgznic carbon in a rocky desertification process of karst ecosystem in Guizhou were studied by using time-space mutual substltitution method.The results snowcu that the soil bulk density ranged from 0.91 kg cm-3 to 1.37 kg cm-3, and soil organic carbon content from 8.1 g kg-1 to 58.9 g kg-1. Soil orogenic carbon storage decreased with the progress of rocky desertification, there were 16.91 kg m-2 in the original karst ecosystem and 0.52 kg m-2 in the extreme rocky desertification area at 0-40 cm soil depth layer. Annual soil organic carbon loss caused by rocky desertification was more than 28 Tg during 1999-2005 in Southwest China. Furthermore, where soil organic carbon went in the rocky desertification process was discussed, as well as the inhibition effects of soil organic carbon on ecosystem restoration, and the reliability of soil orphic carbon calculated by soil bulk density.

关 键 词：喀斯特 石漠化 土壤有机碳 土壤容重 

分 类 号：P931.5[天文地球—自然地理学]