Study on Diversity of Plant Community in Alpine-cold Meadow at Different Altitude

The diversity of plant community in alpine-cold meadow in Songduo country of Huzhu county was investigated and the relationship of the species richness,the ecological dominant index,the diversity index and the relative abundance in plant community of alpine meadow of Kobresia pygmaea with altitude was mainly and ysed.The results showed that the ecological dominant index was decreased with increasing altitude.The diversity index and the evenness were increased with increasing altitude.The spcies richness was firstly increased and then decreased.