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spatial and environmental determinants of plant species diversity in a temperate desert

Journal of Plant Ecology 2016年第2期9卷 124-131页

作者： Rong Zhang Tong Liu Jin-Long Zhang Qin-Ming Sun College of Life Sciences Shihezi University4 North RoadShiheziXinjiang 832003China Coastal Ecosystems Research Station of the Yangtze River Estuary Ministry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringInstitute of Biodiversity ScienceFudan University2005 Songhu RoadShanghai 200438China Flora Conservation Department Kadoorie Farm and Botanic GardenLam Kam RoadTai PoNew TerritoriesHong Kong

Aims Deserts are one of the ecosystems most sensitive to global climate ***,there are few studies examining how changing abiotic and biotic factors under climate change will affect plant species diversity in the temperate deserts of *** study aimed to:(i)characterize species distributions and diversity patterns in an Asian temperate desert;and(ii)to quantify the effects of spatial and environment variables on plant species *** We surveyed 61 sites to examine the relationship between plant species diversity and several spatial/environmental variables in the Gurbantunggut *** and environmental variables were used to predict plant species diversity in separate multiple regression and ordination *** in species responses to spatial and environmental conditions was partitioned by combining these variables in a redundancy analysis(RDA)and by creating multivariate regression trees(MRT).Important Findings We found 92 plant species across the 61 *** and geographic location were the dominant environmental factors underlying variation in site species richness.A RDA indicated that 93%of the variance in the species–environment relationships was explained by altitude,latitude,longitude,precipitation and slope *** and topographic heterogeneity,through their effects on water availability,were more important than soil chemistry in determining the distribution of *** analyses categorized communities into four groups based on latitude,soil pH and elevation,explaining 42.3%of the standardized species *** pH strongly influenced community composition within homogeneous geographic *** findings suggest that precipitation and topographic heterogeneity,rather than edaphic heterogeneity,are more closely correlated to the number of species and their distributions in the temperate desert.

关键词： Gurbantunggut Desert ephemerals redundancy analysis species richness soil pH

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