中国东部花岗岩、玄武岩及石灰岩上土壤微量元素含量的纬向分异

Geographical Tendencies of Trace Element Contents in Soils Derived from Granite, Basalt and Limestone of Eastern China

在中国东部花岗岩、玄武岩和石灰岩地区布设91个采样点，采集土壤剖面和母岩样品，测试13种微量元素的含量，研究其纬向分异规律及影响因素。结果表时：（1）土壤微量元素含量顺序为：玄武岩土壤＞石灰岩土壤＞花岗岩土壤；（2）花岗岩和玄武岩上土壤微量元素含量与母岩接近，石灰岩上土壤微量元素含量远高于母岩；（3）花岗岩上土壤微量元素的含量由北向南呈降低趋势，而玄武岩和石灰岩上土壤微量元素含量由北向南均呈增高趋势，且与游离氧化铁含量的增高同步；（4）微量元素含量与氧化铁含量在玄武岩土壤中的相关性大于这两者在花岗岩土壤中的相关性。

91 soil samples were collected from granite, basalt and limestone areas in eastern China and determined for 13 trace element contents. The geographical tendencies of trace element contents in soils and factors affecting them were studied. (1) The sequences of soil trace element contents were: basalt soils> limestone soils > granite soils. (2) The contents of trace elements in soils of granite areas and basalt areas showed great inheritance of trace element contents from the relevant parent rocks. The contents of trace elements in limestones were very low, but they became very high in limestone soils. (3) Trace element contents of soils derived from granite decreased from north to south, but those derived from basalt and limestone increased obviously from north to south and these tendencies were similar to the tendency of ferric oxide contents in soils. (4) The correlation between the contents of trace elements and the contents of ferric oxide was better in basalt soils than that in granite soils.