Investigation on Ecological Distribution of Rhodiola L.in Xizang and Its Reasonable Protection

Rhodiola were an important economic plants possess great value.Based on the field investigation data and history materials,36 species and 2 subspecies of Rhodiola in Xizang were found.As one of the modern distribution center of Rhodiola,Qinghai-Xizang Plateau had the richest species of Rhodiola,broaden distribution areas and huge resource amount in Rhodiola.The appropriate niches included forest understory,shrub edges,alpine meadow and alpine sand dune by flood among them.Sunny slope was the abundant slope aspect where Rhodiola grew.Resources of Rhodiola were also vulnerable,so reasonable excavation and protection was beneficial to the sustainable utilizing.