青海省高寒草甸不同退化阶段土壤无机碳分异特征  

The variation of soil inorganic carbon of alpine meadow at different degeneration stages in Qinghai Province

作　　者：刘淑丽[1,2] 林丽[1] 杜岩功[1] 李以康[1] 张法伟[1] 郭小伟[1,2] 欧阳经政[1,2] 曹广民[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001 [2]中国科学院大学,北京100049

出　　处：《生态学杂志》2014年第5期1290-1296,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金重点项目(41030105);中国科学院战略性先导科技专项(XDA05050404)资助

摘　　要：采用时空转换的方法，选取青海省高寒草甸退化演替过程中典型退化阶段，探讨高寒草甸不同退化阶段土壤无机碳（SIC）含量及储量分异特征。结果表明：禾草-矮嵩草群落、小嵩草群落、小嵩草剥蚀期和黑土滩型退化草地0～50cm土层SIC总储量分别为0．45、0．10、0．13和1．10kgC·m-2；0～50cm土层范围内，禾草．矮嵩草群落与黑土滩型退化草地存在明显的碳酸盐淀积层（主要在30cm土层以下），而小嵩草群落和小嵩草剥蚀期在剖面内无明显的碳酸盐淀积层；草甸草毡表层特征（厚度、破碎度等）以及土壤容重、pH值与SIC变化特征存在某种协同演化关系；高寒草甸退化与无机碳储量之间没有明显的耦合作用，只有当草甸极度退化（黑土型退化草地）时，草甸SIC分层及总储量特征才表现出明显的差异。In this study, the spatio-temporal transformation method was used to investigate soil inorganic carbon （SIC） storage and content of alpine meadow at different degraded stages in Qinghai Province. We collected soil samples of alpine meadow degraded at four different stages, namely, grass-Kobresia humilis grassland, alpine normal meadow, eroded alpine-type black beach, and degraded grassland. Our results showed that in the 0-50 cm soil profile, the SIC val- ues of the grass-K, humilis grassland, alpine normal meadow, eroded alpine-type black beach, and degraded grassland were 0.45, 0.10, 0.13 and 1.10 kg C · m-2, respectively. A carbon- ates deposited layer was found below the 30 cm soil depth in the grass-K, humilis and degraded grasslands. No such obvious SIC eoncentration layer was observed in the alpine normal meadow and eroded alpine-type black beach. There was a co-evolutionary relationship between the char- acteristics of mettic peipedon （thickness and fragmentation） , bulk density, pH and the charac- teristics of SIC change. No obvious coupling relationship was found between the degeneration of the alpine meadow and the SIC storage. The storage of SIC would change when an extreme degra- dation of the meadow occurred.

关 键 词：高寒草甸 退化阶段 土壤无机碳 储量 

分 类 号：S812[农业科学—草业科学]