云杉截留降雨实验与模型

An experiment and model construction of rainfall interception by Picea koraiensis.

该文通过实验室模拟实验 ,得到了不同雨强和不同叶面积指数组合下的云杉截留降雨过程 ,同时考虑了树冠湿润度的影响 .依据实验资料 ,建立了单位叶面积最大截留量随雨强增大而减小和枝叶截留速率随树冠湿润度变化的定量关系 ,进而构建了云杉截留降雨随雨强和叶面积指数变化的模型 .最后 ,通过对模型模拟验证 ,得到模型对截留过程的模拟精度为 91 5 % .

The interception process of rainfall in a forest canopy is very important in water resource cycles of forest watershed. Most studies have considered the relationship between the interception in one or several rainfall events and precipitation without thorough consideration of the characteristics of rainfall density and vegetation, and therefore little of the study results can be used in a distributed rainstorm-runoff model. After carrying out some simulation experiments in the lab, the authors obtained data of interception process in unattached events with different rainfall densities and leaf area indexes. Based on the data, the relationship between rainfall density and the maximum interception per unit leaf area index is quantified. The change of the interception ratio with the canopy humidity is also identified. Hence, an interception model, in which interception is calculated using rainfall density and leaf area index, is constructed with the consideration of canopy humidity. Finally, with the simulatidon experiment, it is concluded that the precision of the model is 91.5%.