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一、土壤特性曲线渗入到干土中的水,一部分受土粒表面吸附力吸附,为土壤胶体所保持。另一部分被固液界面的吸引力及表面张力保持在微小的土壤毛细管中。当这些力满足后,由于与相邻土壤存在水势差,引起水移动的力大于保持的力,这部分水就释放出来移动到相邻的土壤中去,一直到二者的水势平衡为止。土壤含水量对移动一微小增量水所要作功的影响,因土壤种类不同而异,如图1所示。这种关系
First, the soil characteristics curve infiltration of dry soil water, part of the adsorption by the soil surface adsorption, soil colloids maintained. The other part is held in the tiny soil capillaries by the attraction and surface tension of the solid-liquid interface. When these forces are satisfied, due to the water potential difference with the adjacent soil, the force that causes the water to move is greater than the retained force. This part of the water is released to move into the adjacent soil until the water balance between the two is reached. The effect of soil water content on the work to be done for moving a small incremental water varies according to soil type, as shown in Figure 1. This relationship