北亚热带毛竹林林冠截留模型研究

对北亚热带毛竹林冠截留影响因素如林外降雨、透流雨强度、叶面积指数、林冠干燥度和蒸发系数等进行观测研究，构建了林冠截留模型。结果表明：当实际截留量较大时，模拟值误差大；当实际截留量小时，模拟效果较佳。为了反映林冠截留模型相对误差分布状况，按照相对误差绝对值从小到大（<5 %、5 %~10 %、10 %~20 %、>20 %）的顺序分为4段进行累加统计，得到的实际截留量分别为4512、6944、4079、1583 mm，模拟截留量分别为4482、677、3514、1161 mm，全年林冠截留相对误差为93 %，小于10 %，模拟效果较理想。

Research on model of canopy interception of bamboo forest in northern subtropical area

By investigating rainfall amount,through fall intensity,leaf area index,canopy dryness and evaporation coefficient influencing the canopy interception of northern subtropical bamboo forests,the author carried on studies of interception modeling.The results indicated that: error amounts became notable when real canopy interception amounts was large error amounts became unconspicuous when real canopy interception amounts were small.In order to reflect the distribution of relative error on model of canopy interception,absolute value of relative error was made 4 subsection to accumulate,which respectively were <5 %,5 %—10 %,10 %—20 %,>20 %,and the corresponding real canopy interception amounts were 45.12,69.44,40.79,15.83 mm respectively,simulative canopy interception amounts were 44.82,67.7,35.14,11.61 mm respectively.Relative error of canopy interception in a year was 9.3 %,which indicate we have obtained a better simulation effect.