Study on Species Diversity of Halophytic Vegetation in the Delta Oasis of Weigan and Kuqa Rivers

The species diversity of halophytic vegetation in the delta oasis of Weigan and Kuqa River was analyzed in this paper by using the method of numerical classification.The community Ⅳ with Haloxylon ammodendron as single dominant species has the highest dominance index and the lowest richness index,diversity index and evenness index,whose composition is simple.The community Ⅱ with Alhagi sparsifolia and Haloxylon ammodendron has the higher diversity index and evenness index,and the lower dominance index.The dominant species isn't obvious which combing with other species in the community Ⅱ which has a stable composition.The community Ⅰ with Tamarixram osissina and Haloxylon ammodendron as dominant species has the highest richness index and middle lever dominance index,diversity index and evenness index which has a complex composition of rich species.The community Ⅵ with Phragmites australis and Alhagi sparsifolia as dominant species has the higher richness index and diversity index,the middle lever dominance index and evenness index.The community Ⅲ and Ⅴ has the higher middle lever richness index,dominance index,diversity index and evenness index which has a stable composition.