论文部分内容阅读
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。
Through the study of the spatial variation of F content in the surface soil of Linfen-Yuncheng basin and its influencing factors, the average soil F content was found to be 520mg / kg, which is higher than the national soil background value. The spatial distribution of F in the surface soil is not uniform, showing a trend of increasing from the periphery of the basin to the center of the basin. The results show that the distribution of soil F content is mainly controlled by the physical and chemical properties of soil such as silt and organic matter, the interaction between elements, the adsorption characteristics of F and other factors, human factors also have some influence on it. Soil physical and chemical properties, such as organic matter and silt, have a significant effect on soil F content, indicating that soil F content in the study area is related to the special chemical properties of F and parent rock types. Factor analysis showed that the distribution of F in the topsoil may be affected by natural geology and man-made effects. N, Cd, Se, Cu, Zn and Mo may represent the original symbiotic elements of F; the content of F Mo, Zn, Fe, Mg and so on, which may be related to the adsorption of Fe3 + ions in the soil. The coordination substitution of F- and OH- may be the dominant factor causing the F- adsorption in soil.