| 生物土壤与生态 |
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| Vegetation Spatial Heterogeneity across Longitudinal Dunes in the Southern Gurbantunggut Desert |
| QIAN Yi-bing1, WU Zhao-ning2, YANG Hai-feng3, JIANG Chao4 |
| 1.Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.College of Geology and Exploration Engineering, Xinjiang University, Urumqi 830046, China; 3.Institute of Survey, Planning, and Design, Xinjiang Production and Construction Corps, Urumqi 830002, China; 4.Department of Academic Magazines of Science Press, Beijing 100717, China |
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Abstract One hundred of vegetation quadrats at 5 m×10 m grid across two longitudinal dunes and interdune lands in the southern Gurbantunggut Desert were systemically measured, and 184 sand samples from aeolian sand layers within 0 30 cm were collected for physical and chemical analyses. The results of investigation represented that the distribution of tree-shrub and herbaceous synusia and their inter-relationship were significantly affected by the longitudinal dune landform, and the competition and the spatial complementarity between plant populations made the ecological dominances of two synusia significantly correlated in the arid environment. The geostatistical analysis showed that the spatial heterogeneity of the vegetation across the longitudinal dunes represented a patch-shaped distribution of the species diversity of woody synusia, and the species diversity of herbaceous synusia presented a superposing characteristic of zonal and patchy structures which are parallel with the stretching direction of the longitudinal dunes. The vegetation coverage presented a significant gradient variation in the direction perpendicular to the longitudinal dunes. In comparison with the spatial pattern of the soil physical and chemical properties across the longitudinal dunes, the patterns of vegetation coverage and species diversity of plant communities were close to that of the shallow soil moisture in aspects of autocorrelative range and spatial heterogeneity degree. This is a reflection of the spatially coupling relationship between the vegetation and soil moisture content in the small ecological system across the longitudinal dunes, and also is a result of competition of tree and shrub plants for water and soil resources on small-scale (several meters) and complement on a medium-scale (more than ten to dozens meters).
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Received: 13 August 2010
Published: 20 March 2011
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2011, Vol. 31 
