土壤重金属(镉、铅、铜)化学形态的地理分异研究*

文章以我国9种主要类型土壤和同一地域的棕壤和四种褐土亚类以及红壤带中的非地带性土壤,如酸、中、石灰性紫色土,探讨了在不同自然地理条件下的土壤中,重金属Cd、Pb、Cu形态赋存状态及形态的分异特征,如土壤Pb的水溶态、交换态和弱结合态的相对百分含量随土壤地理带的分布,具南高北低、东高西低的分异规律。而同一地域各亚类的土壤间差异相对较微小。也探讨了土壤性质,如pH值、有机质与土壤重金属形态区域分异的关系,从而揭示了土壤重金属Pb等元素的形态在南北和东西方向土壤序列中的区域性分异规律。

GEOGRAPHICAL DIFFERENTIATION OF HEAVYMEDAL STATE IN SOILS (Cd,Pb AND Cu)

According to the study on nine types of soils, including brown soils, for subtypes of cinnamon soils and other non zonal soils, this paper discusses the existence state and the differentiation characters of heavy medal Cd, Pb and Cu. It also discusses the relationship between soil properties, such as pH and organic matter, and regional differentiation of heavy medal state. Therefore, this paper shows the law of regional differentiation of heavy medals in the soils in the south and north direction and east and west direction.