凈降水量

The mathematical models that could predict the canopy entrapment volume, stemflow volume, throughfall of several communities have been given. 人工林群落對(duì)徑流的調(diào)控能力是的無林地的四倍，但是在高的降雨強(qiáng)度下，這種調(diào)控能力會(huì)明顯降低。

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. 以不同方式進(jìn)入土壤中的水全與作物的種類、冠層結(jié)構(gòu)、種植密度，以及噴灌系統(tǒng)和噴灌時(shí)的農(nóng)田小氣候等因素有關(guān)。

Rainfall intensity also had an effect on rainfall redistribution.As rainfall intensity increased，throughfall percentage of gross rainfall increased and interception percentage decreased. 同時(shí)，降雨強(qiáng)度也影響林冠的水文效應(yīng)，隨著降雨強(qiáng)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. 降雨持續(xù)時(shí)間長(zhǎng)、降雨量小及較高的林冠截留量可能是造成林地凈輸入量為負(fù)值的原因。

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