河西走廊盐化草甸植被分布演替与土壤水盐的关系

On the Relationships among Distrsbution,Succession as well as Soil Water and Salt of Plant Vegetation in Saline Meadow Area of Hexi Corridor,Nohhwestern Gansu,China

采用聚类及排序与直接梯度结合的方法对河西走廊盐化草甸主要植物及群落的分布，演替及其与土壤水盐的关系进行了研究。结果表明，该区植被可划分为５个群丛，与相应的土壤水盐生态类型相一致，且随着土壤水盐呈明显的演替系列。芦苇与赖草是该区的优势植物与广布种，海韭菜、碱蓬及唐古特白刺分别是群落及生境退化的指示种。

The cluster,Ordination and direct gradient analytic methods were used to investigate the distributionand succession of major vegetation together with their soil water and salt contents for explanation of theirintimate relationships existed in hexi Corrklor Saline meadow area of northwestern Gansu,The results showed that the plant communities there could be Classified into five certain associations in accordance with their soil water and salt ecological types and meantimely with the association series of soil water and salt gradient.Both Leymus dasystachys and Phragmites australis are dominant species widespreadly distributed, and Nitraria tangutorum, Suaeda salsa and Triglochin maritimum are only indicator plant spp. existant to show the deteriortated situation of aboriginal plant communities and their habitats all around。