鄂尔多斯盆地北部风积沙覆基岩型包气带结构的生态意义

风积沙覆基岩型包气带结构在鄂尔多斯盆地北部分布面积最广.在其结构及其属性特征分析基础上,重点解析了结构内垂向上土壤水分的富集规律;以沙蒿为例,对喜沙耐旱植被的生长与风积沙厚度、地下水水位埋深间的关系进行了探讨.认识到风积沙覆基岩型包气带结构有利于土壤水富集,是鄂尔多斯盆地北部沙蒿、沙柳等耐旱喜沙植被分布与生长的决定性因素,对维系盆地北部生态系统有重要作用;而地下水位埋深与沙蒿等耐旱植被生长间的关系并不密切.在进行盆地北部地下水资源评价及开发方案制定过程中,应对风积沙覆基岩型包气带的生态意义给予重视.

The Eco-significance of the Sand-sandrock Vadose Zone Structure in the North of the Erdos Basin

Sand-sandrock vadose zone structure spreads widely in the North of the Erods Basin.On the basis of its feature and moisture content,this paper analyzed the relationship between its influencing factors,vadose zone thickness and groundwater table.The results show that: 1 sand-sandrock vadose zone structure """is the critical factor for drought resistent vegetations because of its abundant moisture contents;2.the relationship between the drought resistant plants and water table depth is not close.These results have significant meaning in assessing groundwater and protecting the vadose zone structure for regional eco-environmental protection.