北京密云油松人工林林冠截留模拟

【目的】探讨北京密云水库集水区油松人工林的生态水文过程和影响机理。【方法】基于2006-05-10的21场降雨和气象及林分结构资料，用修正的Gash林冠截留模型对油松人工林林冠截留量进行模拟。【结果】北京密云油松人工林林冠截留量、树干茎流量和穿透雨量的模拟值分别为57.33，1.03和229.51 mm，林冠截留量和树干茎流量的模拟值分别比实测值减小12.6和0.39 mm，相对误差分别为18.02%和27.46%，穿透雨量模拟值高于实测值13.17 mm，相对误差为6.09%；累计林冠截留量模拟值小于实测值，累计林冠截留量相对误差最小值为6%，最大值为32.64%，相对误差在20%～30%的占76.2%，平均累计林冠截留相对误差为25.2%。【结论】模型可以较好地模拟北京密云油松人工林的累计林冠截留量，但模型在本试验区域油松林中应用时，模拟出的累计林冠截留量应加上25.2%的实测林冠截留量值加以校正。

Canopy interception simulation of pine plantation in Miyun of Beijing

【Objective】 The study explored the eco-hydrological processes of pine plantation in Miyun reservoir watershed of Beijing and its mechanism. 【Method】 In this paper , revised Gash canopy interception model was applied to simulate the canopy interception amount of Pine plantation based on the 21field rainfall data , weather information and forest structure data from May to October in 2006. 【Result】 The total amounts of canopy interception , trunk runoff and throughfall were 57.33 , 1.03and 229.51mm.The simulated values of canopy interception and trunk runoff decreased by 12.6mm and 0.39mm respectively compared with the measured value , with the relative error being 18.02%and 27.46%.The simulated values of throughfall was higher than the measured value through 13.17mm , with the relative error being 6.09%.The simulated values of cumulative amount of canopy interception was less than the measured value , with minimum relative error being 6% , maximum 32.64% , 76.2% between 20%-30% and average 25.2%. 【Conclusion】 Model could better simulate cumulative amount of canopy interception of pine plantation in Miyun of Beijing.However when the model was applied in pine plantation of this area , the simulated values of cumulative amount of canopy interception should add 25.2%of the measured value to achieve accuracy.