伊犁绢蒿荒漠不同退化阶段草地植物多样性分析

Analysis on Plant Diversity in Different Degraded Stages of Seriphidium transillense Desert Grassland

对伊犁绢蒿荒漠不同退化阶段草地植物多样性变化的研究结果表明:中度退化维持较高的多样性,形成中度退化>重度退化>极度退化><未退化的规律。群落物种丰富度、均匀度与多样性的相关分析表明,均匀度对多样性具有更大的贡献率,而丰富度呈下降趋势。β多样性的分析结果表明,随着退化演替的加剧,相邻退化梯度之间物种替代速率减慢。

The results of plant diversity analysis in different degraded stages of Seriphidium transillense desert grassland show that media - degradation maintains high diversity, changes as follows： media - degradation 〉 heavy degradation 〉 over - degradation 〉 〈 non - degradation. The related analysis of the richness, evenness and diversity of the community species indicated that evenness makes greater contribution to species diversity than the species richness. The result of the 13 diversity analysis manifests that species replacement become slowly in neighbor degraded stages along with the increase of degradation.