宁夏盐池县不同荒漠化治理措施植物群落稳定性分析

分析不同荒漠化治理措施下植物群落的稳定性，可以为制定防沙治沙对策和措施提供基础数据。以植物α-多样性指数（Shannon-Wiener指数Sw、Simpson指数SD、群落均匀度指数Jsw和Js）和β-多样性指数（相似性系数Cs）、生物量变动系数为指标，从空间和时间2个尺度上分析宁夏盐池县不同荒漠化治理措施下的植物群落稳定性。结果表明：从α-多样性一群落稳定性分析，退耕还林措施下的植物多样性指数和群落均匀度指数较高，人工封育各指数年际间波动较小；从β-多样性一群落稳定性分析，人工封育措施下的植物群落相似性系数较大，且各年间波动较小，群落最稳定，退耕还林地次之；从功能指标分析，人工封育措施下的各年生物量值最高，退耕还林措施下的生物量波动最小。

Analysis on stability of plant community under different measures of desertification control in Yanchi County,Ningxia

Taking 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),biomass change coefficient as targets this article analyze the stability of plant community under different measures of desertification control in Yanchi County,Ningxia from two criteria about S_pace and time.The result indicated: Analyzing based on α-diversity and stability,the plant diversity index and community evenness index of the measure by converting cropland to forests are highest,the change of the indces of the measure about artificial fencing during years is slightest;analyzing from β-diversity and stability,the plant community similarity coefficients of the measure with artificial fencing are highest and the change during years is slightest,so,the plant community is stablest and the stability by converting cropland to forests is inferior to it.Analyzing based on function target,the biomass of years with artificial fencing is biggest,and the change of the biomass by converting cropland to forests is slightest.