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Efficiency of large-scale aided phytostabilization in a mining pond.

Vajihe Shahrokh1, Silvia Martínez-Martínez1, Ángel Faz1

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Environmental Geochemistry and Health
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Aided phytostabilization improved soil quality and reduced metal bioavailability in mining tailing ponds. Micro-topography significantly influences plant growth and survival, impacting long-term success.

Keywords:
AmendmentsBioavailable metalsPhytoremediationVegetation cover percentage

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Area of Science:

  • Environmental Science
  • Soil Science
  • Ecological Restoration

Background:

  • Mining tailing ponds generate waste, causing significant environmental pollution.
  • Heavy metals (Zn, Pb, Cu, Cd) in tailing ponds pose risks to soil and ecosystems.
  • Phytostabilization is a potential method for remediating contaminated mine sites.

Purpose of the Study:

  • To evaluate the effectiveness of aided phytostabilization in reducing metal bioavailability and improving soil quality in a mining tailing pond.
  • To investigate factors influencing heterogeneous vegetation development in a remediated tailing pond.
  • To assess the impact of soil properties and micro-topography on plant growth and survival.

Main Methods:

  • Field experiment using native plant species and amendments (pig manure, slurry, marble waste).
  • Sampling of areas with varying vegetation cover (VC) and a control area after 3 years.
  • Analysis of soil physicochemical properties, total, bioavailable, and soluble metals, and metal sequential extraction.

Main Results:

  • Aided phytostabilization increased soil pH, organic carbon, calcium carbonate, and total nitrogen.
  • Electrical conductivity, total sulfur, and bioavailable metals significantly decreased.
  • Vegetation cover differences were linked to variations in pH, EC, and soluble metal concentrations, influenced by micro-topography and rainfall runoff.

Conclusions:

  • Aided phytostabilization effectively enhances soil quality and reduces metal bioavailability in tailing ponds.
  • Micro-topography plays a crucial role in vegetation success and requires consideration for sustainable remediation.
  • Integrated approaches, including plant selection, amendments, and landscape management, are essential for optimal phytostabilization outcomes.