论森林生态系统与降水的关系

降水与森林生态系统是作用与反作用的关系。因为降水量决定森林植被的存在与否 ,其次才是森林生态系统的水文功能发挥调节降水。但这种反作用是有限的 (如增加降水频率 ,减弱雨强而对年降水量无显著影响 )。事实上 ,规律性的大气环流与大地形及局部地形共同决定水汽的输送路径和输送量 ,从而决定降水总量。植树造林的根本目的是利用森林生态系统的水文生态功能和森林植被—土壤系统的水分涵养功能而产生的“时滞”效应 ,为水资源的有效利用创造条件。

Study on the Relationship between Precipitation and Forest Ecosystem

The precipitation and forest ecosystem affect each other as the precipitation decides whether there is vegetation to be present and the forest ecosystem plays role in coordinating the precipitation through its hydrological function with limited capacity(for example, increasing precipitation frequency and reducing precipitation degree are both with no obvious correlation...) In fact, the law of atmosphere circulation routes an amunt, so that it further controls total precipitation. Time-postpone effect happens when the forest ecosystem plays its hydrological reservoir function with the aid of forming an vegetation-soil system after reforestation, then it provides available water resource.