晋南临汾-运城盆地土壤氟含量及其影响因素

通过对临汾-运城盆地表层土壤F含量的空间变化规律和影响因素的研究,发现土壤平均含F量为520mg/kg,高于全国土壤背景值。表层土壤中F的空间分布不均匀,呈现出由盆地四周向盆地中心递增的趋势。研究表明,土壤F含量的分布主要受控于粉粒和有机质等土壤理化性质、元素间的相互作用、F的吸附特性等因素,人为因素对其也有一定影响。有机质和粉粒等土壤理化性质对土壤F含量的影响较大,说明研究区土壤F含量与F的特殊化学性质和母岩类型有关。因子分析发现,研究区表层土壤F的分布可能受自然地质作用和人为作用2种因素的影响,N、Cd、Se、Cu、Zn、Mo可能代表了F的原始共生元素;土壤F的含量随Mo、Zn、Fe、Mg等元素含量的增加而增加,可能与Fe3 离子在土壤中的吸附作用有关;而F-与OH-的配位置换作用可能是造成土壤中F-吸附的主导因素。

Fluorine content in soils of the Linfen-Yuncheng basin, southern Shanxi, China, and its influence factors

Studies of the spatial changes and influence factors of contents of fluorine and related elements in top soils(at 0-20 cm depth) of the Linfen-Yuncheng basin show that the average fluorine content in soils in the basin is 520 mg/kg,being far higher than that of the background values of China.The F content in top soils is of uneven distribution and has a trend of increase from the peripheries of the basin toward the center.Some statistical methods such as correlation analysis,regression analysis and factor analysis were applied for the study.Study indicates that the distribution of F content in soils is mainly controlled by factors such as the physico-chemical properties of silts and organic matter,interaction between elements and F adsorption,and in addition,the human factor has also certain influence.The physico-chemical properties of silts and organic matter have significant influence on the F content in soils,indicating that the F content in soils is related to the special chemical properties of F and parent rock types.Factor analysis finds that:the F distribution in top soils in the study area is probably influenced by the natural geological processes and anthropogenic processes and N,Cd,Se,Cu,Zn and Mo may represent the original associated elements of F;the F content in soils increases with an increase in Mo,Zn,Fe and Mg contents,which might be related to adsorption of Fe3 ions in soils;whereas the coordination and substitution of F-and OH-might be the dominant factor for adsorption of F-in soils.