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本文对同一地形和同一气候条件下湘南三种典型红壤的水热状况及它们的持水和渗透性质进行了研究。这三种土壤是:花岗岩母质发育的红壤、第四纪红土发育的红壤和紫色土。试验结果表明:第四纪红土发育的红壤持水性好,团聚度高,整个土体水分含量高,然而水分有效性低,渗透性好;花岗岩母质红壤则相反;紫色土则由于含有较多的块状物,因此渗透性也比较好。三种土壤的热量状况有很大的区别,紫色土在整个测定期间始终保持着较高的溫度,而且溫度的变幅大,花岗岩母质红壤的土体溫度是三种土壤中最低的。植被影响土壤的水热状况,而水热状况又反过来影响作物的生长。
In this paper, the hydrothermal conditions and their water holding and infiltration properties of three typical red soils in the same landform and the same climatic conditions were studied. The three soils are: red soil with granite parental development, red soil and purple soil with Quaternary laterite development. The results show that the red soil developed in the lateritic red soil has good water-holding ability, high reunion degree, high water content in the whole soil, low water availability and good permeability, while the red soil in the granite motherland is opposite. The purple soil contains more Block, so the permeability is better. The heat status of the three soils is very different. The purple soil has a higher temperature during the whole measurement period, and the amplitude of the temperature fluctuates greatly. The soil temperature of the granitic parent red soil is the lowest among the three soils. Vegetation affects soil hydrothermal conditions, which in turn affect the crop’s growth.