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对甘肃黄土地区４个土类的土壤水分特征、动态及空间变异规律，以及最大吸湿水、凋萎湿度和持水性能的研究表明，土壤水分动态变异规律呈“双峰－双谷”型，据此在时序上可划分为５个明显的时期：（１）春季增失墒交替期；（２）春夏严重失墒期；（３）夏秋墒情恢复期；（４）秋冬缓慢失墒期；（５）冬季墒情稳定期。随着剖面深度的增加，土壤水分的空间变异明显减小，上层土壤服从对数正态分布，而下层及各累积层服从正态分布。
The study on the characteristics of soil moisture, dynamic and spatial variability, and the maximum moisture sorption, wilting humidity and water holding capacity of four soils in the loess region of Gansu Province showed that the dynamic variation of soil moisture showed a pattern of “bimodal - double valley” Therefore, the timing can be divided into five distinct periods: (1) the increase of spring entropy of soil moisture alternation; (2) spring and summer severe loss of moisture period; (3) summer and autumn soil moisture recovery period; (4) autumn and winter slow loss of moisture period ; (5) winter moisture stable period. With the increase of profile depth, the spatial variability of soil moisture decreased obviously, the upper soil obeyed the logarithmic normal distribution, while the lower layer and each accumulated layer obey the normal distribution.