广西红壤系列土的分带及其环境地球化学特征

THE ZONATION CHARACTER OF THE SERIES OF RED SOILS AND THEIR ENVIRONMENT GEOCHEMICAL PROPERTIES IN GUANGXI

广西红壤系列土的主要类型有砖红壤、赤红壤、红壤 3种 ,由南至北依次呈东西向带状展布 ;其分带性主要受气候所控制 ,而与母岩关系很小。红壤系列土的环境地球化学特征主要是 ,土体的交换容量小 ,盐基的饱和程度差以及土质为酸性。红壤系列土对污染物的净化能力差 ,在红壤区应该注意避免酸雨、重金属等的污染 ;同时因为红壤系列土土地贫瘠 ,应加强其保肥保水能力的研究 ,做好土质改良工作。

The series of red soils in Guangxi are mainly composed of latosol,latosolic red soil and red soil respectively from south to north in EW-strike zonal distribution.The series of the red soils are very clear in zonation and their geographic distribution is mainly controlled by the climate. The soil zones are a little correlated with their parent rocks. The main environmental geochemical character of the ferralsol shows that it has small exchange capacity and low base saturation degree.They are also acid. The red soils are regarded as having low purification from pollution. Therefore, in the zone of red soils, it should be done as much as possible to avoid being polluted by acid rain or sewage which contains heavy metals.The red soils are all impoverished and they should give more study on the amelioration.