Study on vegetation community characteristics and species diversity of halophytic vegetation in typical oasis of northwest arid area.

The vegetation community characteristics and species diversity of halophytic vegetation in a typical oasis of the Northwest Arid Area-the delta oasis of Weigan and Kuqa River were analyzed by the method of numerical classification.The results indicated that the community Ⅳ with Haloxylon ammodendron as single dominant species had the highest dominance index and the lowest richness index,diversity index and evenness index,of which composition was simple.The community Ⅱ with Alhagi sparsifolia and Haloxylon ammodendron had the higher diversity index and evenness index,and the lower dominance index.The dominant species was not obvious which had a stable composition.The communityⅠ with Tamarixram osissina and Haloxylon ammodendron as dominant species had the highest richness index and middle lever dominance index,diversity index and evenness index which had a complex composition of rich species.The community Ⅵ with Phragm ites australis and Alhagi sparsifolia as dominant species had the higher richness index and diversity index,the middle lever dominance index and evenness index;The community Ⅲ and Ⅴ had the higher middle lever richness index,dominance index,diversity index and evenness index which had a stable composition.