Geochemical characteristics and bioavailability of selenium and zinc in soils in an area subjected to water and soil erosion:A case study of Changting County,Fujian Province
Water and soil erosion affects the distribution and partitioning of elements in soils.The distribution and partitioning patterns and bioavailability of trace beneficial elements such as selenium(Se)and zinc(Zn)in water and soil erosion areas serve as significant factors for measuring the ecological effects of water and soil erosion.Through the geochemical survey of soil and crops,this study inves-tigated the geochemical characteristics and bioavailability of Se and Zn in the water and soil erosion area of Changting County,Fujian Province,obtaining the critical geochemical parameters of Se and Zn in soil and crops in the study area.The results are as follows:(1)The soil Se and Zn contents in the study area show median values of 0.43×10-6 and 46×10-6,respectively;(2)Se is enriched in the soil developed from metamorphic rocks,whereas Zn is enriched in the soil developed from metamorphic rocks and granites;(3)The soil Se and Zn contents are higher in bamboo forests compared to other land-use types;(4)The soil Se content shows a decreasing trend as the water and soil erosion intensifies;(5)The bio-concentration factors of Se and Zn are significantly positively correlated with w(Si)/w(Al)ratios,and negatively correlated with Se,Zn,and organic matter.As indicated by the results above,the distribution and partitioning of soil trace beneficial elements like Se and Zn in the study area are primarily subjected to metamorphic rocks and gran-ites.The water and soil erosion is accompanied by a significant soil Se loss.The bioavailability of soil Se and Zn is reduced by the ad-sorption of clay minerals and organic matter.Additionally,there may be a large proportion of inactive Se and Zn in the soil of the water and soil erosion area.
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