安徽省江淮流域土壤地球化学基准值与背景值研究

Soil geochemical baseline and background in Yangtze River–Huaihe River basin of Anhui Province

基于安徽省江淮流域多目标区域地球化学调查数据资料,统计获得了表层和深层土壤地球化学基准值、背景值及相应的地球化学参数,为研究区生态环境评价及相关学科研究提供了基础。研究表明,成土母质类型对土壤元素地球化学基准值影响显著,表层土壤化学组成表现出既对深层土壤具有一定的继承性,又在表生作用下发生某些变化:表层土壤中迁移活动性强的元素和人为扰动污染的元素明显不同于深层土壤;随着地理空间位置的变化,同类成土母质形成环境、成因来源的差异导致其化学组成的空间变异,造成不同地区同类成土母质地球化学基准值有所不同。因此,土壤地球化学基准值研究应更多地考虑地质背景、物质来源等因素的影响。

Geochemical parameters of top and deep soils as well as geochemical baseline and background were calculated based on multi-purpose regional geochemical survey covering Yangtze River-Huaihe River basin of Anhui Province.The concentrations of most elements in top soils are mainly controlled by their concentrations in deep soils.The concentrations of some elements in different soil layers are apparently different.Soil formation processes and anthropogenic activities have had remarkable impact on the distribution of elemental concentrations in soils.It is demonstrated that soil parent material usually has significant influence on geochemical baseline.Geochemical baselines of soils derived from the same parent materials have the tendency to vary in different geographical units.Therefore calculation of soil geochemical baseline should consider spatial variation.These results can be widely used in eco-geochemistry and related multi-discipline research.