Abstract

Knowledge of mass and energy transport is vital to developing and extending agricultural activities in arid and semiarid regions. This work was conducted to investigate the water vapor flux importance in moisture and energy transfer in subsurface soil shallow layers. The experiment was carried out in a sandy soil column installed in the field and irrigated with a pore volume of distilled water. A reference air-dried sandy soil cylinder was installed beside the column. The water content and temperature of the soil column at depths of 1, 5, and 10 cm; surface temperature of the soil column and the air-dried soil cylinder; and temperature at 5‑cm depth in the air-dried cylinder were monitored. The results showed that around 98% of vapor flux was because of thermal gradient. Although the contribution of vapor flux to the total moisture flux was low (about 1%), its role in the total energy flux was significant and ranged from 69 up to 75%. The values of cumulative evaporation estimated using a differential approach were in good agreement with those obtained by the energy balance method.

中文翻译：

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砂土柱中水汽运动与蒸发的关系

摘要

大众和能源运输的知识对于在干旱和半干旱地区发展和扩大农业活动至关重要。开展这项工作以调查水蒸汽通量在地下土壤浅层水分和能量传递中的重要性。该实验在田间安装的沙质土壤柱中进行，并用孔体积的蒸馏水灌溉。在柱子旁边安装了一个参考风干的沙质土壤圆筒。在1、5和10厘米深度处的土壤柱中的水含量和温度；土柱和风干土筒的表面温度；并监测风干缸中5厘米深度处的温度。结果表明，约98％的蒸气通量是由于温度梯度引起的。尽管蒸汽通量对总水分通量的贡献很小（约1％），但其在总能量通量中的作用却很明显，从69％到75％不等。使用微分法估算的累积蒸发值与通过能量平衡法获得的值非常吻合。