Abstract: 【Objective】 To explore the vegetation characteristics and biodiversity of degradation succession in desert in spring in the hope of providing some basic data for the establishment of ecological restoration and sustainable utilization plan.【Method】The Seriphidium transiliense desert was taken as the research object, and the community characteristics and vegetation biodiversity indexes in lightly degraded and heavily degraded desert were studied though field investigation.【Result】(1) The community height decreased by 20.8%, and the community density increased by 6.1 times with the degree of degraded succession increased (P<0.05), but the response of community cover and aboveground biomass on degradation was not significantly diffident (P>0.05). (2) Patrick richness index, Simpson dominant index, Shannon-Wiener diversity index and Pielou evenness index significantly increased by 73.5%, 52.1%, 91.3% and 26.9% with the increased degree of degraded succession (P<0.05), respectively. 【Conclusion】During the process of degeneration succession, the Seriphidium transiliense desert is tending towards low and dwarfing vegetation population and complicated community.

Key words: Seriphidium transiliense; communities characteristics; lightly degraded; heavily degraded; biodiversity

摘要： 【目的】研究蒿属荒漠春季植被特征和多样性的退化演替规律,为建立生态恢复及可持续利用方案提供一定的基础资料。【方法】以伊犁绢蒿(Seriphidium transiliense)荒漠为对象,采用野外调查的方法,研究轻度退化(LD)和重度退化(HD)荒漠的群落特征、多样性指数的春季演替规律。【结果】(1)随着退化演替程度的加重,群落高度显著降低了20.8%,群落密度显著增加了6.1倍(P<0.05),但群落盖度和地上现存量对退化的响应不明显(P>0.05)。(2)随着退化程度的加重,Patrick丰富度指数、Simpson优势度指数Shannon-Wiener指数和Pielou均匀度指数分别显著增加了73.5%,52.1%,91.3%和26.9%(P<0.05)。【结论】在退化演替过程中,伊犁绢蒿荒漠朝着植被种群低矮化,群落复杂化的方向演替。

关键词: 伊犁绢蒿, 群落特征, 轻度退化, 重度退化, 多样性