【摘要】 采用α-多样性指数(Shannon-Wiener指数、Simpson指数、群落均匀度指数Jsw和Js)和β-多样性指数(相似性系数Cs)研究宁夏盐池县草原群落在不同荒漠化治理措施(人工封育、退耕还林、撂荒地)固定样地植物多样性变化。对比2002和2003年不同类型固定样地植物多样性观测数据表明:到2003年,各实验样地的α-多样性指数均有不同程度的提高。β-多样性的研究结果同样表明:在不同治理措施实验样地的种类组成已经发生了一定的变化。此外,本文还进一步分析了引起植物多样性变化的主要原因。更多还原

【Abstract】 The plant diversity of the grassland community under the different desertification controll measures (transform the cropland to forests, fencing and discontinuedfarming or no cultivation )in Yanchi County, Ningxia Hui Autonomous Regionwas investigated methods ofα-diversity index (includingShannon-Wiener index, Simpson index, Jsw and Js which are community evennessindex ) andβ-diversity index (similarity coefficients). Compared with thedifferent fixed sample plotsobservationdata in 2002 and 2003, the results show thatα-diversity of studied plots increased in varying degree in 2003. By means of comparing beta index, the results also show that the species components of experimented plots have changed to various extent. In addition, themain reasons theplant diversity in Yanchi County became better than ever are also presented.更多还原