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通过在径流小区上人工模拟降雨，研究了南方主要的低丘土壤的渗透性能。小区设在一均匀的第四纪红色粘土坡面上（坡度约７°）用人工填充研究土壤建成，小区长８ｍ，宽１．５ｍ，填充土壤厚度４０ｃｍ。结果表明，第四纪红粘土发育的红壤（包括网纹土、耕种和荒地红粘土）和花岗岩发育的荒地红壤较红砂岩发育的红壤（包括耕种和荒地２种）和荒地紫色土的渗透速度快，不容易产生径流和侵蚀。
By simulating rainfall on runoff plots, the permeability of the main lowland soils in the south of China was studied. The plot was set up on an even Quaternary red clay slope (with a slope of about 7 °). Soil was built by artificial filling. The plot was 8m long and 1.5m wide. The thickness of the soil was 40cm. The results showed that the red soil (including soil and tillage and uncultivated red clay) of Quaternary red clay and the red soil of red soil with red granite (including two kinds of tillage and wasteland) and purple soil of wasteland Fast, not prone to runoff and erosion.