民勤沙井子地区沙质荒漠化过程中植被群落物种多样性和排序研究

Species Diversity and Sorting of Vegetation Communities during the Sandy Desertification of Shajingzi Region in Minqin Oasis

基于对民勤沙井子地区植被调查数据,研究了不同群落自然植被基本特征,结果表明:丰富度减小是物种多样性变化的主要原因,均匀度指数与多样性指数呈显著的正相关,丰富度指数和均匀度指数呈负相关,CCA和DCCA二维排序说明了植物群落与环境因子的关系,随着地下水位的下降,植被逐渐向强旱生方向演替。

On the basis of vegetation investigation data at Shajingzi region in the Minqin Oasis,natural vegetation characteristics of different communities were studied.Result shows that species diversity decreased with the decline of the species richness.Richness index and diversity index appear positive correlation.Richness index and the even-ness index appear negative correlation.Two-dimensional sorting of CCA and DCCA illustrates the relationship be-tween plant community and environmental factors.Plant gradually turns toward strong xerarch succession with the decrease of the groundwater level.