青土湖水面形成对区域典型植被分布的影响

腾格里沙漠与巴丹吉林沙漠在石羊河尾闾湖——青土湖区域逐渐形成合围之势，因此向青土湖输水和形成水面对促进区域植被恢复和环境整治具有重要意义。利用2010、2011、2013年不同年份的高分辨率遥感影像资料和研究区的调查资料，通过面向对象分类遥感分类方法对水面和植被类型面积进行了统计分析。结果表明：连年输水形成叠加效应，人工水面面积成倍增加，区域地下水位快速上升。随着水面的形成与变化，芦苇(Phragmitesaustralis)趋水分布，但连片分布格局滞后于水面形成，临接水域的白刺(Nitrariatangutorum)大面积消失。人工水面影响区域生态环境，导致区域典型植被面积随之变化。

Effect of Water Body Forming on the Distribution of Typical Vegetation in Qingtu Lake

Objective]Tengger Desert and Badain Jaran desert gradually formed encirclement situation at Qingtu Lake in Minqin . Therefore it was pushing effect to input water for Qingtu lake and form water body for making vegetation restoration, decreasing regional ecosystem degradation, and promoting the whole regional environmental renovation and ecological restoration of the Shiyang River watershed. Method]In this paper, based on the relative hydrological data of 2010, 2011, 2013 and relating to different years in the same time of high resolution remote sensing image data and study in field , to analyze the area of the water and vegetation types. Result]The results shown that the water area fold increased and fast raise underground water level with superimposed effect of water delivery. With the water body changing , vegetation of Phragmites australis formed by water surroundings, and a large reeds distribution fallen behind the formed water body, while the area of Nitraria tangutorum decreased around the water body. Conclusion]This proved that the formation of artificial water body played a huge facilitation effect for the ecological environment restoration which resulted in change of regional plant community.