Spatial Distribution Characteristics of Throughfall Under Pinus Tabulaeformis Single Tree′s Canopy in Loess Region of Western Shanxi Province

In order to analyze the forest hydrology processes on the Loess Plateau and provide reference for the development and parameterization of hydrological model,spatial distribution characteristics of throughfall were discussed at the scale of the single tree of Pinus Tabulaeformis in the loess region of Western Shanxi Province.7rain gauges were settled under 2sampled trees in accordance with the distance from the stems.The respective throughfall of 15different rainfall events was measured and the influences of rainfall and canopy characteristics on throughfall were analyzed by statistical method.Results showed that:(1)Throughfall percentage in some sample sites was greater than 100%,with the maximum being 155.8%.The reason for the phenomenon is the evidently concentrated rainfall which might be caused by the canopy.(2)Throughfall was positively correlated to rainfall and rainfall intensity,but the correlation with rainfall intensity was not significant.(3)The influence of the distance between sample site and stem on throughfall was attributed by multiple factors which play a major role in throughfall spatial distribution.(4)Throughfall percentage was negatively correlated to canopy density and canopy thickness.