J Plant Ecol ›› 2016, Vol. 9 ›› Issue (2): 124-131.doi: 10.1093/jpe/rtv053

• Research Articles • Previous Articles     Next Articles

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

Rong Zhang1,2, Tong Liu1,*, Jin-Long Zhang3 and Qin-Ming Sun1   

  1. 1 College of Life Sciences, Shihezi University, 4 North Road, Shihezi, Xinjiang 832003, China; 2 Coastal Ecosystems Research Station of the Yangtze River Estuary, Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, 2005 Songhu Road, Shanghai 200438, China; 3 Flora Conservation Department, Kadoorie Farm and Botanic Garden, Lam Kam Road, Tai Po, New Territories, Hong Kong
  • Received:2014-05-08 Accepted:2015-07-04 Online:2015-07-25 Published:2016-03-24
  • Contact: Liu, Tong E-mail:betula@126.com

Abstract: Aims Deserts are one of the ecosystems most sensitive to global climate change. However, there are few studies examining how changing abiotic and biotic factors under climate change will affect plant species diversity in the temperate deserts of Asia. This 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 diversity.
Methods We surveyed 61 sites to examine the relationship between plant species diversity and several spatial/environmental variables in the Gurbantunggut Desert. Spatial and environmental variables were used to predict plant species diversity in separate multiple regression and ordination models. Variation 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 sites. Elevation 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 position. Precipitation and topographic heterogeneity, through their effects on water availability, were more important than soil chemistry in determining the distribution of species. MRT analyses categorized communities into four groups based on latitude, soil pH and elevation, explaining 42.3% of the standardized species variance. Soil pH strongly influenced community composition within homogeneous geographic areas. Our 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.

Key words: Gurbantunggut Desert, ephemerals, redundancy analysis, species richness, soil pH

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