Assembly processes of bacterial and fungal communities in metal(loid)s smelter soil

Miaomiao Li , Jun Yao (1) , Geoffrey Sunahara , Robert Duran (2) , Bang Liu , Ying Cao , Hao Li , Wancheng Pang , Houquan Liu , Shun Jiang , Junjie Zhu , Qinghua Zhang

1 USTB - University of Science and Technology Beijing [Beijing]
2 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

There are few studies on concurrent bacterial and fungal community assembly processes that govern the metal(loid)s biogeochemical cycles at smelters. Here, a systematic investigation combined geochemical characterization, co-occurrence patterns, and assembly mechanisms of bacterial and fungal communities inhabiting soils around an abandoned arsenic smelter. Acidobacteriota, Actinobacteriota, Chloroflexi, and Pseudomonadota were dominant in bacterial communities, whereas Ascomycota and Basidiomycota dominated fungal communities. The random forest model indicated the bioavailable fractions of Fe (9.58%) were the main positive factor driving the beta diversity of bacterial communities, and the total N (8.09%) was the main negative factor for fungal communities. Microbe-contaminant interactions demonstrate the positive impact of the bioavailable fractions of certain metal(loid)s on bacteria (Comamonadaceae and Rhodocyclaceae) and fungi (Meruliaceae and Pleosporaceae). The fungal co-occurrence networks exhibited more connectivity and complexity than the bacterial networks. The keystone taxa were identified in bacterial (including Diplorickettsiaceae, norank_o_Candidatus_Woesebacteria, norank_o_norank_c_AT-s3–28, norank_o_norank_c_bacteriap25, and Phycisphaeraceae) and fungal (including Biatriosporaceae, Ganodermataceae, Peniophoraceae, Phaeosphaeriaceae, Polyporaceae, Teichosporaceae, Trichomeriaceae, Wrightoporiaceae, and Xylariaceae) communities. Meanwhile, community assembly analysis revealed that deterministic processes dominated the microbial community assemblies, which were highly impacted by pH, total N, and total and bioavailable metal(loid) content. This study provides helpful information to develop bioremediation strategies for the mitigation of metal(loid)s-polluted soils.

Domaines: Chimie; Sciences de l'environnement

Miaomiao Li, Jun Yao, Geoffrey Sunahara, Robert Duran, Bang Liu, et al.. Assembly processes of bacterial and fungal communities in metal(loid)s smelter soil. Journal of Hazardous Materials, 2023, 451, pp.131153. ⟨10.1016/j.jhazmat.2023.131153⟩. ⟨hal-04036925⟩