中文摘要：

采用植被样方实地调查结合浅井揭露地下水埋深的方法,建立鄂尔多斯高原苏贝淖周边滩地植被群落总盖度、单物种盖度及物种空间演替与地下水埋深的定量关系。研究表明,群落总盖度与水位埋深在1.6m内有明显相关关系;苔草、碱蓬、芦苇、马兰和芨芨草等低湿地物种存在适生水位,分别为0.4m、0.6m、0.8m、0.8m和1.6m;物种演替与水位埋深关系表明,水位埋深小于0.6m地带,为湿生、盐生植被优势区;大于3.2m地带为旱生、沙生植被优势区。同时,1.6m为生态交错带临界水位,该区域湿生、中生、旱生和沙生等植被类型均有分布,物种数量最多,物种多样性最大。不同水位埋深下的植被分布和演替规律可为预测地下水开发后植被变化演替提供重要科学依据。

英文摘要：

Based on the methods of field investigation and exposing groundwater table by sinking shallow wells with hand drill,the quantitative relationship between groundwater depth and total coverage of vegetation community,respective coverage of each species and species succession in Subei Lake of Ordos plateau were established.The results show that there is significant correlation between total coverage of vegetation community and groundwater depth within 1.6m.The ecological groundwater depth of wet species including Carex tristachya,Suaeda glauca Bge,Phragmites australis and Achnatherum splendens are 0.4m,0.6m,0.8m,0.8m and 1.6m respectively.The relationship between species succession and groundwater depth shows that wet and saline vegetations are predominant when groundwater is depth less than 0.6m.Xerophyte and sandy vegetation are predominant when groundwater is above 3.2m.In addition,1.6m is the critical groundwater depth of vegetation ecotone.This region has the largest number of vegetation species.The law of distribution and species succession in different groundwater depth can provide important scientific roles for vegetation change prediction under groundwater development and utilization.