四种不同母质发育的红壤水分状况研究

在相同的地形和气候条件下,研究了我国东南部地区红砂岩、花岗岩、玄武岩和第四纪红粘土发育的4种典型红壤水分状况及其透水性能。结果表明,4种红壤的持水和透水性能存在不同程度差异,其原因是不同成土母质的土壤机械组成、土壤结构的变化造成的。除玄武岩和红砂岩发育红壤的某些层外,其他土壤各层的土壤渗漏量不随时间变化而变化。4种土壤含水量的年动态变化一般可划分为3个时期:土壤湿润期、土壤水分耗竭期和土壤水分恢复期,但不同年份的时间划分也不尽相同。

MOISTURE REGIMES OF FOUR RED SOILS DEVELOPED FROM DIFFERENT PARENT MATERIALS

Moisture regime and permeability of four representative red soils, originated respectively from red sandstone, granite, basalt and quaternary red clay in Southeast China, have been studied under the same topographic and climatic conditions. The results show that varying differences exist between the four soils in water-holding capacity and permeability because of differences in soil mechanic composition and soil structure as a result of their difference in parent material. Percolation at all levels of the four soils, except at certain levels of the red soils derived from basalt and red sandstone, does not change with the time. The annual dynamic change in water regime of the four soils can normally be divided into three phases: soil moistening, soil moisture exhausting and soil moisture restoring. But the division varies with the year in length of each phase.