不同降雨量下的毛竹林冠截留、透流及干流动态过程研究

Research on the Dynamic Process of Canopy Interception,Throughfall and Stemfall of Phyllostachys pubescens Forest in Different Rainfall Amounts

通过比较毛竹林降雨的林冠截留动态过程发现,当小雨量时,林冠截留曲线与林外降雨曲线吻合;当中、大雨量时,在降雨的中后期林冠截留曲线偏离林外降雨曲线,林冠截留量近乎为零。在林冠截留达到饱和的条件下,会出现截留量是负数情况;透流、干流形成和结束时间都晚于林外降雨,它们的波峰和波谷一般滞后林外降雨,透流雨相对于林外降雨振动频率低,平均振幅也较小,不同降雨量下的动态累计透流率和干流率随时间变化以多项式拟合效果较好。

From the dynamic process of the canopy interception of Phyllostachys pubescens Mezel ex H. deleh forests in the rainfall, we found that： at the light rain class, the dynamic state change curve of the canopy interception fitted together with the dynamic state change curve of the rainfall outside the forest. At moderate and heavy rain class, the dynamic state change curve of the canopy interception deviated the dynamic state change curve of the rainfall outside the forest, the amount of interception was nearly zero, the dynamic state change curve of accumulation with time fitted the minus index best. When the canopy interception attained saturation, the interception appeared to be a negative. The formation and the ending time of the throughfall and stemfall in forests were all late to outside the forests. The wave crest and trough of throughfalls and stemfalls in P. pubescens forests were generally appeared slower than outside, so did were the vibration frequency of throughfalls, the rates of dynamic change curve of accumulative throughfalls and stemfalls fitted mnltinomials well