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本文研究了宝山县五种主要土壤的水分物理特征,主要结果如下:1.测定了本县五种主要土壤的饱和含水量、田间持水量、生长阻滞水分点、初始凋萎点以及永久凋萎点五种水分常数,据此进行了土壤水分分类;2.不同层段土壤的非毛管孔隙分布,以耕作层和淋溶层稍高,犁底层和淀积层极低;3.砂质土壤上作物正常生育有效水和速效水的水容量较之粘质土壤为高,但迟效性有效水和速效水的水容量则相反;4.土层垂直向的渗透性能显著大于水平层向。从垂直层向来看,耕作层、淋溶层较高,淀积层、犁底层极低。
The main results are as follows: 1. The saturated water content, field water holding capacity, water-holding growth retardation, initial wilting point and permanent withering of five major soils in the county were measured. The five moisture constitutive parameters were studied and the soil water classification was carried out according to the above results. (2) The non-capillary pore distribution in different soil layers was slightly higher in the tillage and leaching layers and very low in the plow and sediments; The effective water and quick-impact water of normal crops on soil had higher water capacity than that of clayey soil, but the water capacity of late-available water and quick-impact water was the opposite. 4. The vertical permeability of soil was significantly higher than that of horizontal layer . From the vertical layer from the point of view, farming layer, leaching layer is higher, deposition, plow bottom is very low.