三峡库区马尾松林分对降雨截留效应的研究

Effect of Masson Pine Forestw on Rainfall Interception in the Reservoir Area of the Three Gorges of Yangtze River

长江三峡库区地处中亚热带湿润气候条件下，雨季时间较长，库区马尾松林分截留作用对降雨特性、径流损失和水分循环的影响十分突出。根据林内、林外雨滴观测和林冠截留场资料，本文提出了一次降雨在林冠层再分配的统计模型和林冠截留过程的预报模型，建立了估计林冠层下降雨功能的计算式。较以往的研究，这些模型更客观地模拟了林冠截留效应，并且结构简单，参数易于定量。

The reservoir area of the Three Gorges of Yangtze river is located in the mid-dle subtropical belt with the condition of moist-hot climate,Interception on Massn pine(Pi-nus massoniana Lamb)forests has an obvious effect on the properties of rainfall runoff lossand water cycle because of a long rainy season every year. Based on the data from raindropobservation done outside forest,under forest canopy and on forest interception field,thispaper presents the statistical models of precipitation redistribution in forest canopy floor andthe predictable models of rainfall interception process,and sets up the formula of rainfall en-ergy under forest canopy. Compared with the past research,these models simulates the for-est effects on rainfall interception more objectively.Moreover,the structure of the models issimple and their parameters can be easily obtained.