江苏土壤地球化学分区

On geochemical regionalization of soils in Jiangsu

土壤地球化学分区的实质就是依据不同地区土壤中元素含量等差异及其分布规律,划分地球化学特征一致或相似的土壤分布范围。以江苏1∶25万区域生态地球化学调查新获得的大量土壤样品元素含量等测试数据为基础,从全省土壤元素含量等分布不均匀的现状出发,根据土壤中的元素组合、特殊元素含量差异、酸碱度差异等,并结合各地第四纪地质作用特点等要素,将江苏土壤划分为3个地球化学区、24个地球化学亚区,指出了部分土壤地球化学亚区的特殊用途,为江苏土地资源保护与利用提供了新的线索。

The essence of soil geochemical regionalization was to classify the soil range with identical and similar geochemical charac- teristics based on the varied element concentrations or their enrichment rules in various areas. The authors analyzed the inhomogeneous distribution of soil element content based on new data of soil element content by 1 ： 250 000 regional eco-geochemical investigations in Jiangsu Province. The results showed that the soil in the province could be divided into three geochemical areas respectively named by alkaline-earth-elements enriched soil region in northern Jiangsu （ normally pH 〉 8.0） , Cd-TOC-Mg-Zn enriched soil region along Yan- gtze River （ normally pH 〉 7.5 ）, Si-B enriched soil region in Southern Jiangsu （ normally pH 〈 6.5 ）, three geochemical areas and twenty four geochemical sub-areas were planned, and further studies indicated some special usage for some geochemical sub-areas.