在农田水分平衡中，较难测定的要素有农田蒸腾蒸发量、地下水毛细上升量和土壤水渗漏量。
Of all components of water balance in farmlands, evapotranspiration, capillary rise from a water table and deep percolation are difficult to determine.
水分上升的动力主要来自于植物的蒸腾拉力和导管的毛细作用。
The impetus of water uptake is "transpiration pull"and capillarity phenomena.
结果显示，随着水蒸气活度的增加，膜内水分子簇尺寸增大，并在膜的微孔内产生多层吸附甚至毛细管冷凝，导致扩散系数迅速降低。
With the increase of mean cluster size(MCS)at different water activities, multi-layer sorption and capillary condensation occur, which lead to the diminution of diffusion coefficients in P…
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