甘南亚高山草甸弃耕演替过程中的物种多样性与生产力变化模式及相互关系研究  

Relationship between biodiversity,productivity,and their dynamics during the succession in abandoned croplands of sub-alpine meadows

作　　者：宋晓谕[1] 张仁懿[1] 李新娥[1] 袁建立[1] 储诚进[1] 王刚[1] 

机构地区：[1]兰州大学干旱与草地生态教育部重点实验室,甘肃兰州730000

出　　处：《草业学报》2010年第6期1-8,共8页Acta Prataculturae Sinica

基　　金：国家自然科学基金(30770360)资助

摘　　要：物种多样性与生产力之间的关系一直是生态学领域的研究热点。本研究通过采用空间代替时间的方法,对甘南亚高山草甸退耕时间为5,9,14,19,30年以及顶极群落样地的物种多样性、地上生物量进行调查、分析,探讨亚高山草甸弃耕地演替过程中物种多样性、生产力的变化规律及其相关关系,结果表明,1)弃耕地演替过程中,随着演替时间的推移,植物物种多样性先升后降,呈单峰曲线;2)在演替的前期生产力迅速提高,在第19年时达到最高的183.77 g/m2,之后,生产力基本保持稳定;3)在演替过程中物种多样性与生产力呈正相关关系,在顶极群落中物种多样性与生产力之间无明显的相关关系;4)演替过程中群落中物种-多度分布模式由生态位优先占领型逐渐转变为对数-正态分布。As a topic focus in ecology, the relationship between biodiversity and productivity has drawn much attention from ecologists. We established experiment plots in a sub-alpine meadow of Southern Gansu province, China where there were 5, 9, 14, 19, 30-year abandoned lands and climax plant communities. Based on the succession gradient, we surveyed plant abundance and aboveground biomass to analyse a change model of biodiversity and productivity, and to explore the relationships between them. The biodiversity showed a unimodal curve, indicating the number of species increased first but decreased later along the succession gradient. At the early stage of succession, the productivity enhanced rapidly and reached a peak of 183.77 g/m2 in the 19- year plots, after which, it remained stable. In the process of succession, the biodiversity was positively related to the productivity, though this relationship disappeared in the climax community. As the succession procee- ded, the community pattern gradually changed into a species log-normal distribution from the early niche-preemption.

关 键 词：亚高山草甸 弃耕地演替 物种多样性-生产力关系 物种-多度分布模式 

分 类 号：S812[农业科学—草业科学]