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为验证修正Gash模型在大兴安岭地区兴安落叶松天然林中的适用性,基于2014年4—10月56场降雨,评价兴安落叶松林冠对次降雨、周累积降雨、季节降雨及年降雨截留量的模拟效果。结果表明:观测期内总降雨量为(289.4±1.66)mm,穿透雨量、树干茎流量和林冠截留量分别占同期降雨总量的75.44%、2.60%和21.95%。林冠截留量的模拟值与实测值分别为65.17 mm和63.53 mm,相对误差为2.58%;周累计林冠截留量与实测值的相对误差为2.59%;春、夏、秋季模拟值与实测值相对误差分别为0.71%、3.62%和0.44%。单次降雨林冠截留量只有在降雨量较小情况下,模拟精度较高;当降雨量增加到12.23 mm时,模拟精度显著降低。据此表明,修正Gash模型对兴安落叶松天然林林冠截留总量的模拟具有较好的适用性,可为研究该地区森林水分循环和利用提供科学简便的方法。
In order to verify the applicability of the modified Gash model in natural Larix gmelinii forest in the Greater Xing’an Mountains, based on 56 rainfalls from April to October in 2014, the effects of sub-rainfall, weekly accumulated rains, seasonal rains and annual rainfall interception on Simulation effect. The results showed that the total rainfall during the observation period was (289.4 ± 1.66) mm, the penetration rainfall, stem flow and canopy interception accounted for 75.44%, 2.60% and 21.95% of the total rainfall in the same period respectively. The simulated and measured values of canopy interception were 65.17 mm and 63.53 mm, respectively, with a relative error of 2.58%. The relative error between the total canopy interception and the measured value was 2.59%. The relative error between simulated and measured values in spring, summer and autumn Respectively 0.71%, 3.62% and 0.44%. The single rainfall canopy interception can only improve the accuracy of simulation when the rainfall is small. When the rainfall is increased to 12.23 mm, the simulation accuracy is significantly reduced. The results show that the modified Gash model has good applicability to simulate the total interception of natural forests in Larix gmelinii forest so that it can provide a scientific and convenient method for studying the cycling and utilization of forest water in this area.