【摘要】 土壤中毛管水是传递压力的,毛管水运动的方向,受土壤上层温度变化和土面蒸发制约,与土壤中汽态水的运动方向(由热至冷)一致。下午和晚上因地面辐射而冷却,闭塞空气收缩,潜水向上通过毛细管吸入闭塞空气中,潜水位下降;上午和白天因地面日晒,土温升高,闭塞空气膨胀,排出较粗毛管水,成为重力水而下渗,抬升潜水位。春天大风,土温升高,晚上使潜水位升高,白天土面蒸发加大,又使潜水位下降。用潜水蒸渗仪,可测到大风天改变土壤水分运行的方向。更多还原

【Abstract】 The writer fully and clearly introduces that capillary water is transmiting pressure,the direction of capillary water motion is restricted by upper layer temperature change of soil and soil surface evaporation and the same motion direction of stream state water in the soil(from hot to cold).In the afternoon and in the envening because land surface radiation becomes cold,closed air contraction,phreatic water upward through capillary water indraws into closed air and phreatic because of the sun shines upon land surface,temperature of soil rises high,closed air expansion,discharges fairly thick capillary water,becomes in to bulk water permeates down and raises phreatic water level.In the spring bigger wind falling,temperature of soil rises high,which makes phreatic water level heightens in the night,but in the daytime soil surface evaporation becomes bigger and also makes phreatic water level drop.You can measure changing direction of soil moisture content motion with phreatic water-evaporation-permeation-meter.更多还原