【摘要】 干旱区生态环境脆弱,降水稀少,绿洲植被的生长与地下水关系密切。运用2011年8月Landsat ETM+遥感数据计算提取归一化植被指数(NDVI),结合地下水位埋深观测数据,从大尺度上定量研究鱼卡河流域下游马海绿洲区地下水水位埋深与植被的生长关系。研究表明:马海绿洲适宜植被生长的地下水水位埋深范围为3~4.5m;地下水位埋深为3.2m的区域,植被的生长发育最好;影响植被生长的临界地下水位为4.5m。通过比较马海绿洲、额济纳绿洲和银川平原植被区等三个中国典型内陆干旱区的研究结果发现,植被与地下水位埋深的相关性有显著的差异。更多还原

【Abstract】 Ecological environment is always fragile in the arid areas with sparse precipitation,and vegetation growth has a close relationship with groundwater.In this paper,based on the calculated normalized difference vegetation index(NDVI)from the Landsat ETM+remote sensing data in August 2011 and the observed groundwater depth data,the quantitative relationship between groundwater depth and vegetation growth on the large scale in the Mahai Oasia area downstream of the Yuqia River was studied.The results showed that the vegetation in the Mahai Oasia area grows well with the groundwater depth of 3~4.5m and grows best with the groundwater depth of 3.2m,and the critical groundwater depth affecting the vegetation growth is 4.5m.By comparing the results of Mahai Oasis,Ejina Oasis,and Yinchuan vegetation region,we found that the relationship between vegetation and groundwater depth has significant differences in different regions.更多还原