荒漠植物群落物种多样性及其测度指标比较

多样性指数及其测度指标的选择是群落多样性测度研究的基础，选择反映群落物种多样性、丰富度、优势度和均匀度的10种测定指数，分别以多度、盖度和重要值为测度指标，对克拉玛依农业综合开发区外围荒漠植物群落的物种多样性进行了定量测定，并对所选择的多样性指数进行了相关性分析和主成分分析。分析结果表明：对于荒漠植物群落，以重要值为测度指标的群落物种多样性、丰富度、优势度、均匀度测定结果比以多度和盖度为测度指标的测定结果更为合理；在多样性测定指数中，Shannon-Wiener多样性指数反映的群落多样性更为合理；荒漠植物群落的均匀度指数与多样性指数的相关性比丰富度指数与多样性指数的相关性高，说明物种组成相对稀少的荒漠植物群落其物种多样指数的高低主要取决于物种在群落中的均匀度。

Plant Community Species Diversity and Comparison of its Indices in Arid Desert Land

The choice of diversity index and its measuring index of desert plants is the basis in researching theplant community species diversity. This paper chooses ten measuring indices indicating the community speciesdiversity, richness, dominance and evenness of desert plants to research the species diversity of desert plantcommunities in the peripheral regions of the Karamay Agricultural Developmental Region by taking theabundance, coverage and important value as the measuring indices. The ten indices are analyzed by usingcorrelation analysis and principal component analysis. The results are as follows: the results of species diversity,abundance, dominance and evenness of desert plant communities, measured by using the important value, aremore rational than that measured by using abundance and coverage; among the diversity indices, Shannon-Wienerdiversity index is more rational to reveal the diversity of desert plant communities; in addition, the correlationbetween the evenness index and the diversity index is higher than that between the abundance index and diversityindex, which reveals that the species diversity index of the desert plant communities with poor species is mainlyaffected by the distribution pattern of the species in the communities.