CHARACTERISTICS OF VERTICAL DISTRIBUTION AND MIGRATION OF HEAVY METALS IN FARMLAND SOILS AND ECOLOGICAL RISK ASSESSMENT

DOU Wei-qiang; AN Yi; QIN Li; LIN Da-song; DONG Ming-ming

doi:10.13205/j.hjgc.202102027

Volume 39 Issue 2

Jul. 2021

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(2): 166-172

DOU Wei-qiang, AN Yi, QIN Li, LIN Da-song, DONG Ming-ming. CHARACTERISTICS OF VERTICAL DISTRIBUTION AND MIGRATION OF HEAVY METALS IN FARMLAND SOILS AND ECOLOGICAL RISK ASSESSMENT[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 166-172. doi: 10.13205/j.hjgc.202102027

Citation:

DOU Wei-qiang, AN Yi, QIN Li, LIN Da-song, DONG Ming-ming. CHARACTERISTICS OF VERTICAL DISTRIBUTION AND MIGRATION OF HEAVY METALS IN FARMLAND SOILS AND ECOLOGICAL RISK ASSESSMENT[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 166-172. doi: 10.13205/j.hjgc.202102027

Citation:

DOU Wei-qiang, AN Yi, QIN Li, LIN Da-song, DONG Ming-ming. CHARACTERISTICS OF VERTICAL DISTRIBUTION AND MIGRATION OF HEAVY METALS IN FARMLAND SOILS AND ECOLOGICAL RISK ASSESSMENT[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(2): 166-172. doi: 10.13205/j.hjgc.202102027

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CHARACTERISTICS OF VERTICAL DISTRIBUTION AND MIGRATION OF HEAVY METALS IN FARMLAND SOILS AND ECOLOGICAL RISK ASSESSMENT

doi: 10.13205/j.hjgc.202102027

Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China

Received Date: 2020-03-07
Available Online: 2021-07-19

Abstract

Abstract

In this study, the contents and vertical distribution and migration characteristics of eight common toxic heavy metals(Cd, Cr, Cu, Zn, Pb, As, Hg, Ni) in the soil profile of farmland were analyzed and evaluated by Hakanson potential ecological risk index method. The results showed that Cd, Cr, Cu, Zn, Pb, As, Hg, and Ni were detected in the soil, however, only the average value of the Cd content in the surface soil exceeded the screening risk of soil pollution, indicating that Cd pollution in the top layer of the farmland soil was serious. By analyzing the vertical distribution and migration characteristics of heavy metals in the soil profile of farmland, it was found that Cu, Zn, As, Cd, Hg, and Pb were mainly concentrated in the surface layer except for Cr and Ni. The potential ecological risk assessment results suggested that Cd possessed strongly ecological risk in the top and middle soil, while medium ecological risk in the bottom layer; Cr, Ni, Cu, Zn, As, Hg, and Pb were slightly ecological risk in the top, middle, and bottom soils, indicating that Cd was the main ecological risk factor in different soil layers in the area. The results also showed that the surface soil was of medium ecological risk, and the middle and bottom soils was of slightly ecological risk. In conclusion, the ecological risk of heavy metals in the surface soil of farmland was relatively high, mainly caused by Cd pollution. Therefore, it was necessary to adopt safe use measures such as agronomic regulation or alternative cultivation for risk management to ensure the quality and safety of agricultural products.
- Xiangtan County,
- farmland soil,
- heavy metals,
- vertical migration,
- ecological risk assessment

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References(40)

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