论文部分内容阅读
为了解Gash模型在青海高寒区的适用性,选择大通县宝库河流域的华北落叶松人工林作为研究对象,利用调整后的Gash模型对林地林冠截留的观测结果进行模拟,结果表明:研究区华北落叶松人工林林冠饱和持水量S=0.569mm,树干持水能力St=0.010 4mm,树干径流系数pt=0.23%。观测期间降雨量不小于1mm的25场降雨的林冠截留的实测值为57.03mm,占总降雨量的23.34%,模拟值为61.89mm,占总降雨量的25.32%,模拟值比实测值高4.86mm,相对误差8.51%。此结果优于使用原始Gash模型的模拟结果。根据观测期间所有降雨的模拟截留结果,林冠截留损失最主要的部分是林冠饱和后的蒸发,占截留损失总量的63.62%,所占比例最少的是树干蒸发,仅为截留损失总量的0.30%。研究结果表明Gash模型在该地区具有较好的适用性。
In order to understand the applicability of Gash model in the alpine area of Qinghai Province, the Larix principis-rupprechtii plantation in the Bao-kuhe River drainage area of Datong County was selected as the research object. The observed G-tree model was used to simulate the interception of the forest canopy. The results showed that: The larch plantation canopy saturated water S = 0.569mm, trunk water capacity St = 0.010 4mm, trunk runoff coefficient pt = 0.23%. During the observation period, the measured value of canopy interception of 25 rainfalls with the rainfall of not less than 1mm was 57.03mm, accounting for 23.34% of the total rainfall, the simulation value was 61.89mm, accounting for 25.32% of the total rainfall and the simulated value was higher than the measured value. 4.86 mm, the relative error of 8.51%. This result outperforms the simulation using the original Gash model. According to the simulation results of all rainfall during the observation period, the most important part of the canopy interception loss is the evaporation after the canopy is saturated, accounting for 63.62% of the total interception loss, accounting for only 0.30% of the total interception loss %. The results show that Gash model has good applicability in this area.