贵州主要岩石类型风化土壤微量、稀土元素分布特征与生态环境关系探讨

根据贵州省地表出露岩石分布情况,将贵州分为5个区,即中部的碳酸盐岩区,东部新元古界浅变质岩区,西部威宁-赫章一带的玄武岩区,西北习水侏罗系碎屑岩区和西南部三叠系碎屑岩区.分别描述了4类岩石风化形成土壤的成土情况,认为碎屑岩和变质岩分布区成土性最好,玄武岩次之,碳酸盐岩区最差.对各岩石区形成的土壤微量、稀土元素含量分析,...

Trace Element and Rare Earth Element Content in Main Rock-Type Weathering Soil in Guizhou Province and Eco-Environment Effect

5 rock-type region was divided on the basis of distribution of rock type in Guizhou Province,those are carbonate rock region in central Guizhou,Neoproterozoic metamorphic rock region in eastern Guizhou,Weining-Hezhang basalt rock region in western Guizhou,Jurassic clastic rock region in northwest Guizhou and clastic rock region in southwest Guizhou.Laterization characteristic of 4 rock-types were studied respectively,the result shows that laterization of clastic rock region and metamorphic rock region are best,and laterization of basalt rock is well,laterization of carbonate rock region is weak.The content of trace element and rare earth element in soil of different rock laterization were studied,the result shows that basalt rock forming soil has highest content of trace element and rare earth element,clastic rock forming soil has high content of trace element and rare earth element,surface layer of carbonate rock forming soil has low content of trace element and rare earth element,but base layer soil presents highest content of trace element and rare earth element.Sometime,authors suggested that basalt rock forming soil plants potato very well.Because of carbonate rock forming surface soil is lack in nutrition element;it may be reason for karst environment weak.Metamorphic rock forming soil is lack in element,especially nutrition element.Therefore,metamorphic rock forming soil is bad for agriculture,but good for woody plant growing because of thickness weathering layer of metamorphic rock.