喀斯特石漠化地区不同植被群落的土壤有机碳变化  

Variation of Forest Soil Organic Carbon in Karst Rocky Desertification Area

作　　者：罗海波[1,2] 刘方[2] 刘元生[1] 何腾兵[1] 苏英格 

机构地区：[1]贵州大学环境与资源研究所,贵阳550003 [2]贵州大学资源与环境工程学院,贵阳550003

出　　处：《林业科学》2009年第9期24-28,共5页Scientia Silvae Sinicae

基　　金：国家重点基础研究项目(2006CB403200);贵州大学人才引进项目(Z06516)资助

摘　　要：研究贵州中部喀斯特石漠化地区不同植被群落土壤和小生境土壤中有机碳的数量和质量变化。结果表明:喀斯特石漠化区阔叶林土壤有机总碳含量和腐殖酸碳含量明显高于灌木林、灌草丛和稀疏草丛,而土壤水溶性有机碳含量的变化则相反;喀斯特森林退化后,土壤有机碳的累积量减少、流失量增加;喀斯特小生境土壤有机总碳和腐殖酸碳含量存在明显的水平空间变异:石坑>石沟>石缝>石洞。主成分分析结果表明:喀斯特土壤有机碳变化的第1主要因子由植被类型决定,第2主要因子由小生境类型所决定。The variation of forest soil organic carbon under the various communities and micro-habitats was investigated in karst rocky desertification areas of Guizhou Province. The results showed that the contents of soil total organic carbon and humic acid carbon in the broad-leaved forest soil were obviously higher than that of the soil in brush forest,brush-grass and sparse grass,but the content of soil dissolved organic carbon in those soils was on the contrary. The accumulation of soil organic carbon was reduced and the loss of soil organic carbon was increased with the karst forest degeneration. The results also showed that the soil total organic carbon and humic acid carbon under various micro-habitats were markedly different. The contents of total organic carbon and humic acid carbon in the soil from stone pit were markedly higher than that of the soils from rocky ditch, swallet or stone cavern. The principal component analysis （PCA） showed that the most important factor that influenced the variation of forest soil organic carbon was the community type, followed by micro-habitat.

关 键 词：森林土壤 小生境 土壤有机总碳 腐殖酸碳 土壤水溶性有机碳 喀斯特 

分 类 号：S156.1[农业科学—土壤学] S157.1[农业科学—农业基础科学]