中文摘要：

从水资源管理角度,地下水蒸发量被认为是无效的。特别是在我国的干旱半干旱地区,它被认为是可以通过降低地下水位而节省出来的水资源量。本文将同位素技术和遥感技术相结合,建立了基于点和像素尺度的植被蒸腾量和NDVI之间的线性数学表达式,进而成功将区域蒸散量分离为区域植被蒸腾量和区域地下水蒸发量。根据分离结果,黑河流域地下水蒸发量较大的地段主要位于黑河干流中游以及东居延海,最大地下水蒸发量可达1000 mm/a。

英文摘要：

From the point of view of water resource management, groundwater evaporation is considered to be invalid. Especially in the arid and semi-arid regions of China, it is considered to be water resource which can be saved by lowering the groundwater table. Based on the combination of isotope technology and remote sensing technology, the linear mathematical expression between the vegetation transpiration and NDVI is established in this paper according the point and pixel values. The regional evapotranspiration is successfully separated into regional groundwater evaporation and regional transpiration. According to the separation results, the areas with large groundwater evaporation in the Heihe river basin are the middle reaches of the Heihe river and East Juyanhai lake with the maximum groundwater evaporation up to 1000 mm/a.