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《Acta Ecologica Sinica》 2004-06
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The α diversity of shrubs community in the arid valley of the Minjiang River

YE Min-Sheng~1, GUAN Wen-Bin~(1), TAN Hui~1, MA Ke-Ming~2, LIU Guo-Hua~2, WANG Xi-Lin~1(1. Key Lab. of Soil and Water Conservation, Beijing Forestry University, Beijing 100083; 2. Research Center for Eco-environment Sciences, CAS, Beijing 100085,China).  
The α diversity of plant community is one of the major components of ecosystem functions. It was influenced by many environmental factors, such as soil and topographic characteristics .Conversely, plant community diversity patterns also influence the soil characteristics. The upper reaches of Minjiang River located in southwestern China is a ecological fragile transition zone from the Qinghai-Tibet Plateau to Sichuan basin. Shrubs, as a main vegetation type in this area, play a vital role in regional environmental protection. Therefore, it is important to examine the relationships between plant diversity and environmental factors to understand the process of ecosystem dynamics. This paper reports a field study on shrub community diversity in the area. Canonical correlation analysis among vegetation ,soil and topography factors shows that significant correlation exists between each pair of the variables. Altitude and slope direction have great influences on total nitrogen, organic matter, soil water, species diversity in the shrubs layer and shrubs layer coverage, while species diversity in the shrubs layer and shrubs coverage is closely related to the total nitrogen, organic matter, and soil water content. Species diversity in both the herbs layer and shrubs layer are increased at first, then decreased, and then increased with the increase of altitude. Species diversity in the herb layer is higher than that in the shrub layer, and changes of species diversity in the herbs layer is greater than that in the shrubs layer. Both herbs layer and shrubs layers have high species diversity from at the 1400~1600 m and 2000~2200 m altitudes. Species diversity of different plant formations indicates that Pertya sinensis-Jasminum humile Formation, Berberis wilsonae,Lonicera japonica Formation and Spiraea Spp. Formation have higher species diversity. The Leptodermis purdomi Formation, Caryopteris spp. Formation and Bauhinia faberi-Sorphora vrcifolia Formation have lower species diversity. Ranks of the species diversity in different transects varied as follows: for shrubs layer ,transect3 transect1 transect2; and for herbs layer, transect1 transect3 transect2. The variance of community species diversity in different slope directions ranked as shrubs layer, shaded slope half sunny and half shaded slopesunny slope, herbs layer, half sunny and half shaded slope shaded slopesunny slope. The variance of community species diversity in different slope shape and slope position indicated the following ranking at both in shrub layers and herb layers: concave slopestraight slope convex slope,upper slopemiddle slopelower slope.
【Fund】: 国家重点基础研究发展规划资助项目 (G2 0 0 0 0 4680 7)~~
【CateGory Index】: Q16;Q948.15
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