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本文研究了25年林龄的油松人工林和天然山杨林的林冠截留量及其变化。结果表明:油松人工林和山杨林林冠年截留量分别为95.2mm和73.4mm,占年降水量的19.6%和14.7%。其中对降雨的截留量分别为78.0mm和71.1mm,分别占降雨量的17.4%和15.5%;对降雪的截留量为17.2mm和2.3mm,分别占降雪量的45.1%和5.9%。林冠截留量也有季节变化,两林分夏季截留量51mm,占同期降水量的15.8%。油松林冬季截留量较小,但占同期降水量的比例高,山杨林两者均小。林冠截留过程分为截留、透过、饱和三个阶段,其累积截留量与累积降水量呈I=apb函数关系。
This paper studied canopy interception and changes of Pinus tabulaeformis plantations and natural Populus × bracteos forests in 25 years of age. The results showed that the canopy interception of Pinus tabulaeformis plantation and Populus simonii forest were 95.2 mm and 73.4 mm, accounting for 19.6% and 14.7% of the annual rainfall respectively. Among them, the rainfall interceptions were 78.0mm and 71.1mm, accounting for 17.4% and 15.5% of the rainfall respectively; the interceptions of snowfall were 17.2mm and 2.3mm, accounting for 45.1% and 5.9% of the snowfall respectively. Canopy interception also has seasonal changes, the two forest interception summer volume 51mm, accounting for 15.8% of precipitation over the same period. Pinus tabulaeformis in winter interception is small, but the proportion of precipitation in the same period, the mountain is small. Canopy interception process is divided into interception, penetration, saturation of three stages, the cumulative interception and cumulative precipitation showed I = apb function.