Responses of bacterial communities along 50 years chronosequence succession in soils of a V-Ti mine tailing dam with vegetation reclamation by Heteropogon contortus.

Authors

Ying Yang, Yi Huang, Xiaowen Liu, Yunhe Liu, Dan Zhou, Shijun Ni

Published in

Journal of hazardous materials. Volume 514. Pages 142690. Jun 17, 2026. Epub Jun 17, 2026.

Abstract

At present, there have been many studies on the effects of heavy metals on plants and microorganisms, but there is a lack of relevant studies on long-term effects. The purpose of this study was to systematically clarify the spatiotemporal distribution of heavy metals in soil-plant system and the responses of soil bacterial communities adjacent to a tailing dam piling up over 50 years. Soil pH, total organic carbon (TOC), particle size, soil bulk density (BD), and heavy metals (V, Cr, Cd) and Heteropogon contortus, were selected and analyzed on the MaJiaTian (MJT) tailing dam along the phytoremediation chronosequence. Our results demonstrated that the enrichment of heavy metals in soil were caused by long-term tailing dumping. The concentration of Cd and the extractable fraction of heavy metals in the roots have been increased with reclamation time, which markedly affected the compositions of bacterial communities in rhizosphere soils. Furthermore, the abundance of Proteobacteria (from 16.8% to 26.0%) and Patescibacteria (from 2.00% to 4.00%) in surface soil has also gradually increased with time. It's observed that the Heteropogon contortus rhizosphere activated the soil microbial communities. Soil acid-soluble fraction of vanadium (Acid-V) was found to affect bacterial community abundance negatively (λ = -0.529, p < 0.001). The majority of networks topological properties differ significantly according to null distribution models, confirming that rhizosphere effects non-randomly alter co-occurrence patterns. This study reveals Heteropogon contortus and corresponding rhizosphere bacterial communities can improve soil microecology through their growth and reproduction along 50 years.

PMID:
42320101
Bibliographic data and abstract were imported from PubMed on 20 Jun 2026.

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