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农业生产用地因其地理分布的自然气候条件及土壤理化特性的差异,其土壤水分状况是不同的。如果无灌溉条件,在较大范围内控制和调节这种差异,是很困难的。气候条件和土壤理化特性基本相同的某一地区,由于土壤水分状况受地形、植被及小气候的影响,其差异也广泛存在。农业生产中,了解一年内各时期地块间土壤水分的差异及其规律是十分必要的。这样能够更好地进行轮作倒茬、作物布局、施肥和中耕等。因此,我们于1984～1986年对旱地土壤贮水量及差异进行了观测研究。
Because of its geographical distribution of natural climatic conditions and soil physical and chemical properties, agricultural land use is different. Without irrigation, it is difficult to control and adjust this difference over a large area. In some areas where climate conditions and soil physical and chemical properties are basically the same, the differences exist due to the influence of topography, vegetation and microclimate on soil water status. In agricultural production, it is necessary to understand the differences and laws of soil moisture between plots in different periods of the year. This will allow better crop rotation, crop layout, fertilization and cultivating. Therefore, we conducted an observational study of soil water storage and its difference in dry land from 1984 to 1986.