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Beyond Metal(loid) Immobilization: Redox-Stratified Biocrusts Shield Humid Mining Regions.

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Biological soil crusts create stratified layers that immobilize metals in humid mining sites. An oxygen barrier in the upper layer and sulfide formation in the lower layer aid in metal stabilization.

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Area of Science:

  • Environmental Microbiology
  • Biogeochemistry
  • Ecological Restoration

Background:

  • Biological soil crusts (biocrusts) exhibit vertical stratification influencing hydrological and elemental cycles.
  • Their role in metal(loid) immobilization, especially in humid mining regions, is not well understood.
  • Understanding biocrust heterogeneity is crucial for ecological restoration in contaminated environments.

Purpose of the Study:

  • To investigate the stratified microbial communities and metabolic potentials in humid mining tailings biocrusts.
  • To elucidate the mechanisms of metal(loid) immobilization mediated by biocrust stratification.
  • To provide theoretical support for biocrust-based remediation strategies in humid mining regions.

Main Methods:

  • Integrated physicochemical characterization of biocrusts.
  • Bioinformatic analysis of microbial communities and metabolic genes.
  • Assessment of stratification effects on metal(loid) distribution and speciation.

Main Results:

  • Biocrusts showed distinct functional layers: a photoautotrophic layer (PL) and a heterotrophic layer (HL).
  • The PL formed an oxygen barrier via clay-silt and polysaccharide accumulation, limiting oxygen infiltration.
  • The HL possessed sulfidogenic potential, facilitating metal(loid) sequestration through sulfide formation in underlying tailings.

Conclusions:

  • Biocrust stratification creates distinct redox zones that effectively immobilize metal(loid)s in humid mining tailings.
  • An oxygen barrier in the upper layer and sulfide precipitation in the lower layer are key stabilization mechanisms.
  • Biocrusts offer a promising, naturally mediated approach for environmental remediation in humid mining regions.