Abstract: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 env...