林冠截留降雨研究指标的探讨

Discussion on Indexes of Rainfall Interception by Forest Canopy

在研究林冠截留降雨问题中,过去通常采用林冠截留量和截留率指标,最近又提出了林冠截留容量指标。本文结合贡嘎山峨眉冷杉林截留降雨资料对林冠截留容量的概念和确定方法进行阐述,同时对三个指标的特点进行对比,对比结果表明采用截留容量指标是合理且可行的,此外截留容量不仅可以充分揭示林冠对降雨截留作用的大小,而且可以满足在不同林分之间进行比较的需要。同时,截留容量与降雨量的关系可以用函数公式表达,其中的参数反映了林冠特征。

When we study on the problem of forest canopy intercepting rainfall, the canopy interception and interception percentage used to be the index and the canopy interception capacity is proposed recently. Combined with the rainfall interception data of Abies fabri forest on Gongga mountain, we describe the concept of capacity of canopy interception and method to measure the capacity of canopy interception approximately. At the same time, we compare the features of three indexes and the results showed that the interception capacity as the index is reasonable and feasible and the interception capacity not only can fully reveal the ability of rainfall interception by forest canopy but also can be used to compare the abilities of different forest-stands. At the same time, the relationship between interception capacity and rainfall can be expressed by function formula, whose parameters can reflect the characteristics of canopies.