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Purpose <p>Owing to advantages like cost-effectiveness and eco-friendliness, soilless revegetation represents a promising measure for ecologically rehabilitating nonferrous metallic tailings. Nonetheless, high heavy metal levels, low fertility and poor water retention capacity of tailings bring challenges to the vegetation construction.</p> Methods <p>In the present work, conditioner combined with straw were added into composite amendments to succeed in soilless revegetation.</p> Results <p>The results demonstrated that the incorporation of composite amendments dramatically improved tailing available NPK separately by 109.03-139.92%, 248.98-373.18% and 143.52-186.01%, and lowered pH to relatively neutral from alkaline. Moreover, bioavailability of heavy metals was prominently reduced, with declines in the acid soluble fraction by 14.91-54.52%, which led to lowered levels of heavy metals in paspalum (<i>Paspalum vaginatum</i> Swartz), ryegrass (<i>Lolium perenne</i> L.), and erect milkvetch (<i>Astragalus adsurgens</i> Pall.). Application of composite amendments promoted the soil fungal, bacterial and actinomycete microflora growth to different degrees.</p> Conclusions <p>Further, as revealed by principal component analysis, the microecological performance of copper tailings was most prominently enhanced by the combination of conditioner and straw for erect milkvetch, followed by ryegrass and paspalum. Overall, the present work offers insight into amendment-aided soilless revegetation and its microecological impact to expand ecological rehabilitation of copper tailings.&#xa0;</p>

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Conditioner and Straw Assisted Soilless Revegetation of Oligotrophic and Heavy Metal Contaminated Copper Tailings

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Weiwei Wang,
  • Jinchun Xue,
  • Liping Zhang,
  • Min He,
  • Jiajia You

摘要

Purpose

Owing to advantages like cost-effectiveness and eco-friendliness, soilless revegetation represents a promising measure for ecologically rehabilitating nonferrous metallic tailings. Nonetheless, high heavy metal levels, low fertility and poor water retention capacity of tailings bring challenges to the vegetation construction.

Methods

In the present work, conditioner combined with straw were added into composite amendments to succeed in soilless revegetation.

Results

The results demonstrated that the incorporation of composite amendments dramatically improved tailing available NPK separately by 109.03-139.92%, 248.98-373.18% and 143.52-186.01%, and lowered pH to relatively neutral from alkaline. Moreover, bioavailability of heavy metals was prominently reduced, with declines in the acid soluble fraction by 14.91-54.52%, which led to lowered levels of heavy metals in paspalum (Paspalum vaginatum Swartz), ryegrass (Lolium perenne L.), and erect milkvetch (Astragalus adsurgens Pall.). Application of composite amendments promoted the soil fungal, bacterial and actinomycete microflora growth to different degrees.

Conclusions

Further, as revealed by principal component analysis, the microecological performance of copper tailings was most prominently enhanced by the combination of conditioner and straw for erect milkvetch, followed by ryegrass and paspalum. Overall, the present work offers insight into amendment-aided soilless revegetation and its microecological impact to expand ecological rehabilitation of copper tailings.