中文摘要：

为了解干旱半干旱区草原植物生态位格局,运用Levins生态宽度指数及Pianka生态位重叠指数,对宁夏盐池长期定位监测点人工封育草原植物生态位宽度及生态位重叠进行了计量。结果表明：核心区内生态位宽度最大的是阿尔泰狗哇花,达0.81,边缘区和外围区生态位宽度最大的都是丝叶山苦荬,分别为0.77和0.83。对生态位重叠度的分析结果表明,生态位宽度与生态位重叠度之间并不存在直接的线性关系。封育措施是草场恢复和重建的主要措施,但是长期完全封育并不利于植被恢复和群落稳定。

英文摘要：

In order to find the vegetable niche pattern in arid and semi-arid grassland region,the niche breadth and niche overlapping of plants in artificial fencing grassland in Yanchi county of Ningxia province were measured by means of Levins niche breadth index and Pianka niche overlapping index.The results showed that the largest niche breadth in core area was Heteropappus altaicus（Willd.） Novopokr.With 0.81,and that in edge area and outside area all was Ixeris chinensis var.graminifolia（Ledeb.） H.C.Fu with 0.77 and 0.83,respectively.The results of niche overlapping analysis also showed that the niche breadth and niche overlapping did not have a direct linear relation.Fencing has been used as a main measure for rehabilitation of rangeland all over the world,but complete fencing for a long time is detrimental to vegetation restoration and the stability of plant community.