无牧草原生态系统营养元素的生物地球化学特征  

Biogeochemical characteristics of nutrient elements in ungrazed grassland ecosystem in Xilin River Basin.

作　　者：耿元波[1] 章申[1] 董云社[1] 孟维奇[1] 

机构地区：[1]中国科学院地理科学与资源研究所环境生物地球化学与健康实验室,北京100101

出　　处：《应用生态学报》2003年第2期219-222,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目 (499710 05);中国科学院地理科学与资源研究所知识创新领域前沿项目(CXIOGA0006;GXIOGE0 10301);中国科学院知识创新工程重大资助项目(KZCX1 SW 0 1 0 4)

摘　　要：以内蒙古锡林河流域的两种优势草原群落羊草草原和大针茅草原为研究对象 ,探讨了中纬度地区未放牧情况下的草原生态系统植物营养元素的生物地球化学特征 .结果表明 ,两类草原群落土壤 植物系统中土壤分室N、P、K、S、Ca、Mg、Si的贮量远大于植物亚系统的贮量 ,地上活体和枯草分室的各元素贮量小于根分室 .在两类草原群落中 ,N、P、K、S从枯草分室中消失的速率要大于Ca、Mg和Si.羊草草原的枯草分室元素流失量大于大针茅草原 .研究区草原生态系统中 ,羊草草原物质的生物地球化学循环近于平衡状态 ,大针茅草原处于失衡状态 .The biogeochemical characteristics of nutrient elements in Leymus chinensis community and Stipa grandis community, which were both scarcely disturbed by human activities, in Xilin River Basin, Inner Mongolia were studied. The results showed that the storage of N, P, K, S, Ca, Mg, and Si in the soil compartment of soil plant system was higher than that in the plant subsystem of two communities,and their storage in the live shoots compartment was lower than that in the litter compartment. The disappearing rate of N, P, K and S from the litter compartment was higher than that of Ca, Mg, and Si in the two grassland communities.The decomposition rate of litter in Leymus chinensis community was higher than that in Stipa grandis community. In the grassland soil plant system,the matter flowing mass kept balance in Leymus chinensis community, but lost balance in Stipa grandis community. The matter participating in biogeochemical cycling in Leymus chinensis community was more than that in Stipa grandis community.

关 键 词：未放牧草原 草原生态系统 营养元素 生物地球化学特征 

分 类 号：S812[农业科学—草业科学]