中文摘要：

为了揭示贡嘎山峨眉冷杉林、密云水库油松林和大兴安岭落叶松林3种针叶林冠对降雨的截留作用,采用截留容量作为衡量指标。截留容量指标不受气象因素及雨前枝叶的干湿程度的影响,只与林冠自身的特征因素有关,所以能够真实反映不同林分类型对降雨的截留作用的差别。根据实测林冠截留资料,利用相同雨量下取最大值的方法近似确定3种林分截留容量与降雨量的关系,并以莱因斯利公式为基础,计算了各自的截留容量公式。通过分析3种林分林冠的特性以及截留容量与降雨量的关系曲线可以得出：3种针叶林截留容量与降水量关系大致趋势相同,贡嘎山峨眉冷杉林与密云水库油松林的截留容量随降雨量增加的速度比大兴安岭落叶松快;贡嘎山峨眉冷杉林对降雨的截留作用最强,其次为密云水库油松林,大兴安岭落叶松林最小。

英文摘要：

The interception capacity was used as an index to reveal rainfall interception function of three c niferous forests including Abies fabri forests of Gongga Mountain, Pinus tabulaeformis forests of Miyun Reservoir and Larix grnelinii forests of Greater Xing＇an Mountains. The interception capacity can reflect the differences in the rainfall interception of different forests because it is affected by characteristics of can- opies, not meteorological factors and dry-humidity of branches and leaves before rainfall. Based on the ob- servation data of canopy rainfall interception,the relationship between interception capacity and rainfall of three forests were determined by the method of taking maximum interception under the same rainfall. The formula of the interception capacity was calculated based on the Linsley. Several conclusions were obtained by analyzing the characteristics of the three forests canopies and the relationship curves between intercep- tion capacity and rainfall： the relationships between the interception capacity and rainfall of the three conif- erous forests substantially had the same trend and the interception capacities of A. fabri forests and P. tabulaeformis forests increased faster with the increase of rainfall than L. gmelinii forests. the rainfall in- terception function of A. fabri forests was the strongest,followed by P. tabulaeformis forests,L, grnelinii forests was the minimum.