水土流失区土壤硒、锌地球化学特征及其生物有效性——以福建省长汀县为例

doi:10.11720/wtyht.2024.1336

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Abstract

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 investigated 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 granites. The water and soil erosion is accompanied by a significant soil Se loss. The bioavailability of soil Se and Zn is reduced by the adsorption 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.

Key words： water and soil erosion soil Se Zn bioavailability

Received: 28 July 2023 Published: 19 September 2024

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	Articles by authors
	Zhi-Min TANG
	Xiao-Dong ZHANG
	Li-Hui MEI
	Long ZHAN
	Guo-Guang CHEN
	Hong-Ying LIU
	Mo ZHOU
	Ming ZHANG
	Jie ZHANG

Cite this article:

Zhi-Min TANG,Xiao-Dong ZHANG,Li-Hui MEI, et al. 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[J]. Geophysical and Geochemical Exploration, 2024, 48(4): 1125-1135.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1336 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I4/1125

Rock formation types in the study area

Distribution map of soil erosive area in Changting County

Histogram of soil selenium(a) and zinc(b) content in the study area

Descriptive statistical results of soil selenium and zinc content in the study area

Box plot of selenium(a) and zinc(b) content in soils developed from different rock formations in the study area

Box plot of soil selenium(a) and zinc(b) in different land use type

Box plot of soil selenium(a) and zinc(b) content in soil erosive area with different extent

Geochemical map of soil selenium(a) and zinc(b) in the study area

Results of principal component analysis

Soil element loading of the principal component

Correlation coefficient between rice selenium and zinc contents and root soil indexes

Scatter plot of rice BCF_Se (a)、BCF_Zn (b) vs soil w(Si)/w(Al) values in the study area

Scatter plot of rice BCF_Se (a)、BCF_Zn (b) vs soil organic matter in the study area

Scatter plot of rice BCF_Se (a)、BCF_Zn (b) vs soil selenium、zinc in the study area

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