广西荔浦市土壤—农作物中重金属迁移转化及生态效应

doi:10.11720/wtyht.2024.3686

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Abstract

In order to understand the content and distribution characteristics of heavy metals in soil and crops in Lipu,soil and crops (rice, Lipu taro, citrus, water chestnut) were collected. Todetermine the pH value of soil samples and the total amount of As, Cd, Cr, Hg, Ni, Pb, Cu, Zn and the form content of As, Cd, Cr, Hg, and Pb.The content of As, Cd, Cr, Hg, Pb in crop samples was measured.The bioconcentration factor (BCF) of heavy metal elements was calculated. The migration and transformation and ecological effects of heavy metal in the soil-crop system are analyzed. The results showed that:① The topsoil in the study area is predominantly acidic in the study area. The average contents of As, Cd, Cr, Hg, Ni, Pb, Cu, and Zn in the surface soil in the area were 13.57×10^-6, 0.33×10^-6, 87.06×10^-6, 0.153×10^-6, 27.49×10^-6, 30.46×10^-6, 27.94×10^-6, 82.53×10^-6.Respectively, all of which were higher than the national soil background values.②The heavy metal content in rice crops is higher than that in Lipu taro, citrus, and horseshoe.The heavy metal content is also different in rice roots, stems, and seeds.③ The bioaccumulation coefficient of heavy metal was generally high in rice. When comparing different parts of rice, the bioconcentration coefficients of heavy metals were greatest in the roots and least in the seeds. And when comparing different crops, the migration capacity of heavy metals in the soil-rice system was significantly higher than that of Lipu taro, citrus and water chestnut.④ The exchangeable state of Cd in the study area is significantly higher than As, Cr, Hg, and Pb. Cd is the most active soil heavy metal in the study area, it should be paid more attention to prevent excessive Cd in crops from causing harm to people.

Key words： Lipu city heavy metals soil crops migration and transformation ecological effects

Received: 17 December 2021 Published: 27 June 2024

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	Yu-Xiong JIANG
	Mei-Lan WEN
	Qi-Ming PAN
	Bo-Chang JIANG
	Zhong-Wei WANG

Cite this article:

Yu-Xiong JIANG,Mei-Lan WEN,Qi-Ming PAN, et al. The migration,transformation and ecological effects of heavy metals in soil-cropsystem in Lipu, Guangxi[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 858-867.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.3686 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/858

3])
1—Guiping Formation;2—Wanggao Formation;3—Gufeng Formation;4—Qixia Formation;5—Dapu Formation;6—Huangjin Formation;7—Yingtang Formation;8—Luzhai Formation;9—Rongxian Formation;10—Wuzhishan Formation;11—Liujiang Formation;12—Dongcun Formation;13—Guilin Formation;14—Baqi Formation;15—Tangjiawan Formation;16—Donggangling Formation;17—Xindu Formation;18—upper section of the Xindu Formation;19—lower section of the Xindu Formation;20—Sipai Formation;21—Dale Formation;22—Hexian Formation;23—Lianhuashan Formation; 24—consolidated rock boundaries;25—rock production;26—measured positive faults;27—measured reverse faults; 28—regional faults;29—working area;30—rivers;31—limestone ore (bed) points;32—clay ore (bed) points;33—lead ore (bed) points;34—iron ore (bed) points;35—manganese ore (bed) points (beds) points;36—polymetallic ore (beds) points;37—gold ore (beds) points;38—silicification
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Geological map of the study area (modified according to the reference[3])
1—Guiping Formation;2—Wanggao Formation;3—Gufeng Formation;4—Qixia Formation;5—Dapu Formation;6—Huangjin Formation;7—Yingtang Formation;8—Luzhai Formation;9—Rongxian Formation;10—Wuzhishan Formation;11—Liujiang Formation;12—Dongcun Formation;13—Guilin Formation;14—Baqi Formation;15—Tangjiawan Formation;16—Donggangling Formation;17—Xindu Formation;18—upper section of the Xindu Formation;19—lower section of the Xindu Formation;20—Sipai Formation;21—Dale Formation;22—Hexian Formation;23—Lianhuashan Formation; 24—consolidated rock boundaries;25—rock production;26—measured positive faults;27—measured reverse faults; 28—regional faults;29—working area;30—rivers;31—limestone ore (bed) points;32—clay ore (bed) points;33—lead ore (bed) points;34—iron ore (bed) points;35—manganese ore (bed) points (beds) points;36—polymetallic ore (beds) points;37—gold ore (beds) points;38—silicification

Bitmap of crop sampling points

Matching scheme of soil heavy metal speciation analysis method

Statistical characteristic values of heavy metal elements in soil(n=3967)

Characteristic values of heavy metal contents in crop samples

Column of the comparison of the average content of heavy metals in different parts of rice

Variation range of bioconcentration coefficient of different crops

The percentage of different chemical forms of heavy metals%

Chemical fractions of heavy metals in soil samples

Logarithmic comparison of Cd, Hg, Pb exchangeable content and Cd, Hg, Pb content in rice

Logarithmic comparison of Cd, Hg, Pb exchangeable content and Cd, Hg, Pb content in citrus

Logarithmic comparison of Cd, Hg, Pb exchangeable content and Cd, Hg, Pb content in horseshoe

Logarithmic comparison of Cd, Hg, Pb exchangeable content and Cd, Hg, Pb content in Lipu taro

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