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作 者 ：闵庆文,何永涛,李文华,李贵才

期 刊 ：生态学报 2004年 24卷 10期 页码：2130~2135

关键词：泾河流域；生态建设；森林植被；生态需水；农业气象；

Keywords:Jinghe watershed, ecological restoration and construction, forest vegetation, ecological water requirement, agrometeorology,

摘 要 ：从农业气象学原理出发 ,森林植被的生态需水可以理解为林地的蒸散耗水量。根据土壤水分有效性的划分 ,林木暂时凋萎含水量和生长阻滞含水量分别是能保证林木基本生存和正常生长时土壤含水量的下限 ,据此可以作为林地最小生态需水定额和适宜生态需水定额计算的依据 ,其数值通过计算林地的潜在蒸散并利用土壤水分修正系数和林木系数进行订正获得。根据遥感图像资料 ,在 GIS支持下 ,计算了泾河流域现有林地生长季的最小生态需水量和适宜生态需水量 ,分别为 2 0 396 0× 10 4 m3和340 330× 10 4 m3。

Abstract:Jinghe is the second-branch of the Yellow River with the length of 450km and the watershed is about 45421 km~2. For the sake of dry climate and human activities, there are only thin vegetation there. The serious soil and water loss caused by degraded vegetation ecosystems is one of the most serious regions of soil and water loss in the Loess Plateau and one of the main silt sources floating in the Yellow River. Therefore, the research on ecological water requirement in the watershed will be important to the...

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