广西红壤类土的地球化学演化和退化

分析广西红壤类土（红壤土、赤红壤土和砖红壤土）的成壤环境条件、地球化学特征及其变化规律，认为砖红壤土应该是红壤类土风化的最终土壤类型；广西砖红壤土的人布范围将有扩大的趋势，而红壤土的范围将会缓慢缩小；广西是我国酸雨重灾区之一，酸雨为红壤类土退化创造了有利的外部环境条件，可能会加速广西红壤类土的退化，红壤类土的演化实际上是地力的退化过程，对于生物而言必定会导致生态的变异或退化；红壤类土的退化会加速铝、铁在土壤中的积累，其对环境的污染和对人类身体健康可能造成有害的影响。

Geochemical Evolution and Degeneration of Red Soils in Guangxi

The environmental condition of forming of the red soils as well as geochemical features and their change behavior of the red soils include red soil, crimson soil and laterite are analyzed.The following should be paid attention. Laterite is the final type of soils in the revolution of the red soils; the distribution area of laterite in Guangxi has a trend of enlarging, while the area of the red soil may gradually reduce; Guangxi is one of heavy acid rain regions of China,and acid rain produces a favor condition for the degeneration of the red soils,which may result in a change or degeneration of ecological environment for life forms; the degeneration of the red soils may accelerate the accumulation of aluminum and iron in soil, which may cause pollution to surroundings and harmful to human health.