净降水量

The mathematical models that could predict the canopy entrapment volume, stemflow volume, throughfall of several communities have been given. 人工林群落对径流的调控能力是的无林地的四倍，但是在高的降雨强度下，这种调控能力会明显降低。

Percentages of stemflow and throughfall in total water applied are affected by crop species, canopy characteristics, plant density, sprinkler irrigation system, field topography and microclimate. 以不同方式进入土壤中的水全与作物的种类、冠层结构、种植密度，以及喷灌系统和喷灌时的农田小气候等因素有关。

Rainfall intensity also had an effect on rainfall redistribution.As rainfall intensity increased，throughfall percentage of gross rainfall increased and interception percentage decreased. 同时，降雨强度也影响林冠的水文效应，随着降雨强度的增加，穿透雨率升高，截留率下降。

The negative net throughfall fluxes of some elements resulted from the longer rainfall duration, the smaller rainfall and the extreme values of interception losses in the studied period. 降雨持续时间长、降雨量小及较高的林冠截留量可能是造成林地净输入量为负值的原因。

Keywords Acid deposition;throughfall;Lake Taihu; 酸沉降;林冠穿透水;太湖;