中国南方碳酸岩风化成土地球化学过程与环境变化

One feature of ecological fragility in karst areas in South.China is marked by thin soil. The formation and evolution of soil has.been disputed for a long time in academic circles. This project selects.karst areas in Guizhou Province as research objects and explores the.parent material of soil, geochemical weathering process of carbonate,.dating of laterite, karst rocky desertification,possible utilization of.REE in soil and its ecological effect, etc. Some significant research.results have been achieved. Two stage model for carbonate weathering to.formation of soil layer has been worked out. The parent material of soil.is proven to be mainly resulted from carbonate weathering. Widely.distributed laterite in karst terrains is one kind of ancient soils..Geochemical barrier in rock-soil boundary results in REE abnormal.super-enrichment in carbonate weathering profile. There exists.essential linkage between the distribution of carbonate types and karst.rocky desertification. REE in soil can alleviates or eliminates effects.of acid rain on crop. Those results have great impacts on further.researches about respondence of uplift of Tibet plateau in its southeast.flank, karst ecological environment and ecological restoration.

以中国西南部碳酸盐岩分布区为重点解剖对象，主要研究碳酸盐岩风化成土机制和速率、风化成土过程中元素和同位素的地球化学过程，成土年代学及风化壳的时空演化规律。通过风化壳次生粘土矿物组合与氧同位素组成的研究，探讨该地区晚第三纪以来的气候变迁历史，建立碳酸盐岩风化成土作用与环境变化的耦合模型，为区域可持续发展提供科学依据。