割一年休一年割草制度下羊草群落植物多样性动态变化  

Dynamic changes of plant biodiversity in Leymus chinensis community clipped every other year

作　　者：王泽环[1] 宝音陶格涛[1] 包青海[1] 仲延凯[1] 

机构地区：[1]内蒙古大学生命科学学院,呼和浩特010021

出　　处：《生态学杂志》2007年第12期2008-2012,共5页Chinese Journal of Ecology

基　　金：国家重点基础研究发展规划项目(2007CB106807);国家自然科学基金资助项目(30460086)

摘　　要：利用1982—2002年样方观测资料,对典型草原区羊草草原群落割一年休一年刈割处理过程中的植物多样性变化规律及引起这些变化的主要植物种群进行了研究。结果表明:建群种羊草的个体数量先下降然后略有上升,但总体呈下降趋势;偶见种和伴生种增加,但组成有所不同。就群落多样性而言,多样性指数和均匀性指数均呈现一个明显高峰值的单峰曲线,物种分布的均匀度是影响多样性指数变化的主要因子。群落主要植物种群密度、生物量与多样性指数存在显著的相关关系,这与它们在群落中的作用有关。By using the field observation data in 1982-2002, this paper studied the dynamic changes of plant biodiversity in Leymus chinensis community of typical steppe clipped every other year, and the main populations resulting in the changes. The results showed that within the observation years, the number of the individuals of dominant species L. chinensis had a slight increase after an initial decrease but decline was the general trend. Incidental species and companion species increased, with the composition being different to some degree. As for the community diversity, the indices of both diversity and evenness demonstrated a single peak curve, and had obviously high peak values. The evenness of plant species distribution played an important role in the changes of diversity indices. Moreover, the density and biomass of main populations in the community correlated significantly with diversity indices, exhibiting the significance of the main populations in the community.

关 键 词：羊草草原 刈割处理 多样性 

分 类 号：S543.9[农业科学—作物学]