宁夏盐池县不同荒漠化治理措施植物多样性研究

 分析不同荒漠化治理措施下植物多样性变化,可以为制定防沙治沙对策和措施提供基础数据。采用α多样性指数(ShannonWiener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,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,还进一步分析了引起植物多样性变化的主要原因。

Study on Plant Diversity of Different Control Measures of Desertification in Yanchi County,Ningxia

The changes of the plant diversity under the different desertification controlling measures will contribute to make countermeasures and measures of desertification combating and controlling. The plant diversity of grassland community under the different desertification controlling measures (by converting cropland to forests, artificial fencing and discontinuing farming and letting go out of cultivation) in Yanchi County, Ningxia Hui Autonomous Region was measured by using the methods of α-diversity index (including Shannon-Wiener index, Simpson index, J_sw and J_s which are community evenness indces) and β-diversity index (measured by similarity coefficients). Compared with the different fixed sample plot observation data in 2002 and 2003, the results show that α-diversity of studied plots increased in varying degree in 2003. By means of comparing beta index, the results also show that the species composition of experimented plots have changed to various extent. In addition, the main causes why the plant diversity in Yanchi County became better than ever is also presented.