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采用实际观测与理论计算相结合方法研究了沙地表层土壤吸湿凝结水量及其变化过程。沙土水分吸湿凝结过程可分两个阶段：第一阶段是由沙土自身物理性质决定的分子凝结过程，所吸收水量主要受温度和湿度影响，最大不超过沙土最大吸湿水量；第二阶段是由近地面微气象条件决定的水分凝结过程，所吸收水量受空气水汽压、地面温度和地表可利用能量的影响。采用能量平衡和空气动力学综合方法计算沙地吸湿凝水量及其动态变化，与实测值相比结果合理，方法是可行的。
The combination of actual observation and theoretical calculation was used to study the moisture absorption and condensation in the surface soils of sandy land and its variation process. Sand moisture moisture condensation process can be divided into two phases: the first phase is the molecular condensation process determined by the physical properties of sand, the absorbed water is mainly affected by temperature and humidity, the maximum does not exceed the maximum moisture content of sand; the second stage by the near The moisture condensation process, which is determined by the micro-meteorological conditions on the ground, is influenced by the air-vapor pressure, the ground temperature and the energy available on the surface. The method of energy balance and aerodynamics is used to calculate the amount of hygroscopic condensate and its dynamic change in sand area. Compared with the measured data, the result is reasonable and the method is feasible.