缙云山自然保护区不同森林类型林冠的截留作用

Canopy interception of different forest types in the Three Gorges Region of Yangtze River

为探讨长江三峡地区的森林水文作用,并为长江三峡的植被建设提供依据,研究重庆缙云山自然保护区3种森林类型典型林分的林冠截留作用。结果表明:3种林分截留率的大小顺序为针阔混交林(18.87%)>常绿阔叶林(11.76%)>楠竹林(10.68%);该地区林冠截留率与降水量呈一定的相关性,随降雨量的增加而增加,二者呈直线回归关系;从自由穿透系数来看,楠竹林>常绿阔叶林>针阔混交林。通过对比分析,认为研究地区针阔混交林对林冠的截持作用最好。

In order to understand the water conservation function of forest in the Three Gorges Region of Yangtze River and provide fundamental basis for vegetation construction of this region, the function of canopy interception of three main forest types based on the data from fixed sample plots in Jinyun Mountain in Chongqing City were studied. The results showed that the descending order of canopy interception capability of different vegetation types was broadleaf-conifer mixed forest （18.87%）, evergreen broad-leaf forest （ 11.76% ）, and Phyllostachys pubescens forest （ 10.68% ）. The descending order of throughfall coefficient of these four forest stands was： Phyllostachys pubescens forest, evergreen broad-leaf forest, and the broadleaf- conifer mixed forest. Based on analyzing and comparing the results, the effect of forest canopy interception of mixed forests is the most fine.