应用生态学报2011，Vol.22Issue(9)：2253-2258,6.
喀斯特山区不同植被类型土壤有机碳的变化
Variation of soil organic carbon under different vegetation types in Karst mountain areas of Guizhou Province, Southwest China
摘要
Abstract
This paper studied the variation characteristics of soil organic carbon (SOC) and differ-ent particle sizes soil particulate organic carbon ( POC) in normal soil and in micro-habitats under different vegetation types in typical Karst mountain areas of southwest Guizhou. Under different veg-etation types, the SOC content in normal soil and in micro-habitats was all in the order of bare land < grass < shrub < forest, with the variation range being 7. 18-43. 42 g ? kg-1 in normal soil and be-ing 6. 62-46. 47 g · kg-1 and 9.01-52. 07 g ? kg-1 in earth surface and stone pit, respectively. The POC/MOC ( mineral-associated organic carbon) ratio under different vegetation types was in the or-der of bare land < grass < forest < shrub. Under the same vegetation types, the POC/MOC in stone pit was the highest, as compared to that in normal soil and in earth surface. In the process of bare land-grass-shrub-forest, the contents of different particle sizes soil POC increased, while the SOC mainly existed in the forms of sand- and silt organic carbon, indicating that in Karst region, soil carbon sequestration and SOC stability were weak, soil was easily subjected to outside interference and led to organic carbon running off, and thus, soil quality had the risk of decline or degradation.关键词
喀斯特/植被类型/小生境/有机碳/土壤颗粒Key words
Karst/ vegetation type/ micro-habitat/ organic carbon/ soil particles.分类
农业科技引用本文复制引用
廖洪凯,龙健..喀斯特山区不同植被类型土壤有机碳的变化[J].应用生态学报,2011,22(9):2253-2258,6.基金项目
国家自然科学基金项目(40971160)、贵州省优秀青年科技人才项目(黔科合人字[2009]21号)、贵州省高层次人才科研特助经费项目(TZJF-2008-40)和贵州省科学技术基金项目(黔科合J字LKS[2009]20号). （40971160）
