凈降水量
The mathematical models that could predict the canopy entrapment volume, stemflow volume, throughfall of several communities have been given. 人工林群落對徑流的調(diào)控能力是的無林地的四倍,但是在高的降雨強度下,這種調(diào)控能力會明顯降低。
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,降雨強度也影響林冠的水文效應(yīng),隨著降雨強度的增加,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)時間長、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值的原因。
Keywords Acid deposition;throughfall;Lake Taihu; 酸沉降;林冠穿透水;太湖;