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Journal of Soils and Sediments

, Volume 18, Issue 9, pp 2924–2934 | Cite as

Temporal and spatial variation and risk assessment of soil heavy metal concentrations for water-level-fluctuating zones of the Three Gorges Reservoir

  • Shunxiang Pei
  • Zunji Jian
  • Quanshui Guo
  • Fanqiang Ma
  • Aili Qin
  • Yujuan Zhao
  • Xuebing Xin
  • Wenfa Xiao
Soils, Sec 3 • Remediation and Management of Contaminated or Degraded Lands • Research Article
  • 128 Downloads

Abstract

Purpose

This study aimed to reveal the temporal and spatial variation of soil heavy metal concentrations in the Three Gorges Reservoir area (TGR) water-level-fluctuating zone (WLFZ) and evaluated its pollution status and potential ecological risks and provide scientific basis for ecological risk prevention and ecological restoration of the TGR.

Materials and methods

This study was based on long-term monitoring of soil heavy metals (Cu, Pb, Cd, and Cr) before water level fluctuation (2008) and after 1 (2009), 4 (2012), or 7 (2015) cycles of water level fluctuation at the altitude of 155–172 m in the Wushan (WS) and Zigui (ZG) sections of the TGR, and pollution status and potential ecological risks of each heavy metal element were evaluated by index of geoaccumulation and potential ecological risk index.

Results and discussion

The Cd concentration increased with the increase in the number of reservoir water level fluctuations, whereas the concentrations of Cu, Cr, and Pb varied with the monitoring site. The Cd showed clear horizontal transfer characteristics. Moreover, with the increase of the frequency of water level fluctuations the Cd concentration at ZG (near the dam) were higher than those at WS (away from the dam). After 7 cycles of water level fluctuation, the concentrations of most soil heavy metal were not obvious differences between soil layers (except Pb). Before and after the reservoir water level fluctuation, Cd contamination level changed from pollution-free to strong or extremely polluted, Cu contamination level changed from pollution-free to moderately polluted, and Cr and Pb were pollution-free. Before the fluctuation of the reservoir water level, the potential ecological risk of Cd in the WS reached a classification of strongly polluted, whereas pollution at ZG was considered to be low level. However, after 4 cycles of water level fluctuation the Cd pollution level increased to a very high level, whereas Cu, Cr, and Pb remained consistently low.

Conclusions

There is an obvious temporal and spatial variation of heavy metal concentrations for WLFZ of TGR. Cd concentration increased with the increase in the number of reservoir water level fluctuations. Heavy metal concentrations changed from WS > ZG to WS < ZG after the impact of water level fluctuations. After 7 cycles of water level fluctuation, the distribution of heavy metals in different soil layers tends to be uniform (except Pb). Cd pollution is more serious, and there is a strong potential ecological risk.

Keywords

Risk assessment Soil heavy metal concentrations Temporal and spatial variation Three Gorges reservoir Water-level-fluctuating zone 

Notes

Acknowledgments

Thanks to the graduate students Yi Kang and Nini Zhu who participated in part of the annual field survey and soil sample testing.

Funding information

This work was supported by grant from the “12th Five-Year” National Science and technology support program for rural areas (2015BAD07B040301).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shunxiang Pei
    • 1
  • Zunji Jian
    • 2
  • Quanshui Guo
    • 2
  • Fanqiang Ma
    • 2
  • Aili Qin
    • 2
  • Yujuan Zhao
    • 2
  • Xuebing Xin
    • 1
  • Wenfa Xiao
    • 2
  1. 1.Experimental Centre of Forestry in North ChinaChinese Academy of ForestryBeijingChina
  2. 2.State Forestry Administration, Key Laboratory of Forest Ecology and Environment, Institute of Forest Ecology, Environment and ProtectionChinese Academy of ForestryBeijingChina

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