柴达木盆地乌图美仁区植被覆盖率变化及其与地下水的关系  

Variation of vegetation coverage and its relationship with groundwater in Wutumeiren area of Qaidam Basin

作　　者：金晓媚[1] 刘金韬[2] 夏薇[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]水利部水利水电规划设计总院,北京100011

出　　处：《地学前缘》2014年第4期100-106,共7页Earth Science Frontiers

基　　金：国家自然科学基金项目(41372250);中央高校基本科研业务费专项(265201346)

摘　　要：那棱格勒河乌图美仁区位于青海柴达木盆地西南部,气候干旱少雨,生态系统脆弱。基于MODIS NDVI数据,应用遥感方法,对乌图美仁区2000—2011年的植被覆盖率进行了计算,并分析了地下水对其的影响。结果表明：研究区内裸土和低覆盖率植被的面积是逐年减小的;而较低覆盖率、中等覆盖率、较高覆盖率及高覆盖率植被的面积都是逐年增加的;研究区植被生长与地下水位埋深的关系较为密切。乌图美仁地区植被的地下水位埋深范围为0.4~3m,在水位埋深为0.9m的地方,植被长势最好;当研究区的地下水位埋深小于2m时,水质矿化度小于3.5g/L,植被发育较好。Located in southwest part of Qaidam Basin in Qinghai Province,the climate of Wutumeiren area of Nalinggele River basin is arid and the ecosystem is fragile.Based on MODIS NDVI,the vegetation coverage of Wutumeiren area during the period of 2000-2011 was estimated and the impact of groundwater was also discussed using remote sensing method.The result indicated that areas of bare soil and low vegetation coverage were decreased with time.On the contrary,the areas of low-moderate,moderate,moderate-high and high vegetation coverage were increased with time.The groundwater depth has important impact on vegetation.The corresponding interval of groundwater depth to vegetation in the study area is 0.4 mto 4 m.The vegetation growth is best when the groundwater depth is 0.9m.The vegetation growth is also well when TDS is smaller than 3.5g/L in the area with groundwater depth lower than 2m.

关 键 词：MODIS NDVI 植被覆盖率 地下水位埋深 地下水矿化度 

分 类 号：P641[天文地球—地质矿产勘探] X173[天文地球—地质学]