一、土壤持水特性1、土壤持水特征曲线入渗到干土中的一部分水,受土粒表面吸附力吸附,为土壤胶体所保持;另一部分水被固液界面的吸引力及表面张力保持在细小的土壤毛细管中。当这些吸引力满足后,由于与相邻土壤存在水势差,即引起它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 First, the soil water retention characteristics 1, soil water retention curve infiltration into the dry soil part of the water, adsorbed by the adsorption of soil surface adsorption for soil colloids; the other part of the liquid-solid interface is attractive and surface tension Keep in tiny soil capillaries. When these attractive forces are satisfied, the part of the water is released to move into the adjacent soil due to the water potential difference with the adjacent soil, ie the force causing it to move greater than the retained force