干旱半干旱地区植被生态用水计算

干旱半干旱地区是生态环境比较脆弱的地区 ,特别是人类不合理开发 ,使生态环境受到严重威胁。为了挽救中国西部干旱半干旱地区已遭破坏的生态环境 ,我国政府提出了“退耕还林”的号召。针对干旱半干旱地区 ,植被生态系统实际用水量以及达到某一目标要求的生态用水量如何计算或合理确定 ,对流域规划、生态建设以及水资源合理配置都有重要意义。先从生态系统的一般意义上来介绍生态用水的概念 ,进而介绍植被生态用水的计算方法 ,并针对“退耕还林”和“植被生态改善与恢复”情况下的生态用水计算问题进行专门介绍。

Study on Vegetation Ecological Use for Water Resources in Arid and Semiarid Region

Eco environment is more fragile in arid and semiarid region. Especially in the condition of human irrational development, eco environment suffers serious threat. In order to save eco environment in arid and semiarid region in western China, our government made demand of forest restoration from cropland. Scientificmanagement and protection of vegetation eco environment is very important to protecting eco environment against disruption and promoting the coordinated growth of soc economy system and eco environment system and building a harmonious relationship between human behavior and natural world, especially in the arid and semiarid region, western China.In view of arid and semiarid region, how to count and define actual water quantity used for vegetation ecological system and ecological use for water resources for some goal? It is very important in river basin program, eco environment construction and protection, water resources rational disposition. First, this paper introduces the concept of ecological use for water resources from the general meaning of ecological system, and then introduces its calculation method. This paper specially introduces the method of calculation of ecological use for water resources in case of forest restoration from cropland and vegetation ecology improve and resume.