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通过对林冠截持过程的研究,将单场降雨划分成很多个小的时段,顺序计算各小时段内降雨在林冠内的分配,建立了一个林冠降雨截持模型.模型考虑了冠层和树干干燥度对冠层雨期蒸发的影响,并在计算雨期蒸发时引入冠层叶面积指数、单位林地面积上树干表面积.运用模型对华北落叶松林的降雨截持进行模拟,结果表明,模拟穿透雨与实测穿透雨基本吻合,误差在±1 mm范围内,但在小降雨(<6 mm)时模拟值偏低;树干茎流量模拟值偏低,茎流模拟相对误差随着降雨量增大而减小.同时模拟了穿透降雨的过程,结果与林内自动气象站实测穿透降雨的过程基本吻合,模拟效果较好.
Through the study of canopy interception, single rainfall was divided into many small periods, and the distribution of rainfall within the canopy was calculated in sequence, and a canopy rainfall interception model was established.The model considered the canopy and trunk Dryness on the canopy evaporation during the canopy rain period and introduced the canopy leaf area index and the surface area of the trunk per unit area of the canopy during the rain period calculation.The rainfall intercept of the Larix principis- The error was within ± 1 mm, but the simulated value was low when the rainfall was small (<6 mm). The simulation value of stem flow was low and the relative error of stem flow simulation increased with the increase of rainfall While the simulation of the process of penetration of rainfall, the results with the forest automatic weather station measured penetration process basically consistent with rainfall, the simulation effect is better.