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Variance of soil bacterial community and metabolic profile in the rhizosphere vs. non-rhizosphere of native plant Rumex acetosa L. from a Sb/As co-contaminated area in China
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2023-05-22 , DOI: 10.1016/j.jhazmat.2023.131681
Fanghan Qian 1 , Xiangmiao Su 1 , Ying Zhang 1 , Yanyu Bao 1
Affiliation  

Heavy metals (HMs) contamination poses a serious threat to soil health. However, the rhizosphere effect of native pioneer plants on the soil ecosystem remains unclear. Herein, how the rhizosphere (Rumex acetosa L.) influenced the process of HMs threatening soil micro-ecology was investigated by coupling various fractions of HMs, soil microorganisms and soil metabolism. The rhizosphere effect alleviated the HMs’ stress by absorbing and reducing HMs’ direct bioavailability, and the accumulation of ammonium nitrogen increased in the rhizosphere soil. Meanwhile, severe HMs contamination covered the rhizosphere effect on the richness, diversity, structure and predicted function pathways of soil bacterial community, but the relative abundance of Gemmatimonadota decreased and Verrucomicrobiota increased. The content of total HMs and physicochemical properties played a more important role than rhizosphere effect in shaping soil bacterial community. Furthermore, As was observed to have a more significant impact compared to Sb. Moreover, plant roots improved the stability of bacterial co-occurrence network, and significantly changed the critical genera. The process influenced bacterial life activity and nutrient cycling in soil, and the conclusion was further supported by the significant difference in metabolic profiles. This study illustrated that in Sb/As co-contaminated area, rhizosphere effect significantly changed soil HMs content and fraction, soil properties, and microbial community and metabolic profiles.



中文翻译:

中国 Sb/As 联合污染区本地植物 Rumex acetosa L. 根际与非根际土壤细菌群落和代谢特征的差异

重金属 (HMs) 污染对土壤健康构成严重威胁。然而,本土先锋植物对土壤生态系统的根际影响仍不清楚。在此,根际 ( Rumex acetosa L.) 通过耦合不同组分的 HMs、土壤微生物和土壤代谢,研究了影响 HMs 威胁土壤微生态的过程。根际效应通过吸收和降低HMs的直接生物利用度来减轻HMs的胁迫,增加根际土壤中铵态氮的积累。同时,严重的HMs污染掩盖了根际对土壤细菌群落丰富度、多样性、结构和预测功能途径的影响,但芽单胞菌的相对丰度下降,疣微菌群的相对丰度增加。在塑造土壤细菌群落方面,总重金属含量和理化性质比根际效应更重要。此外,观察到 As 与 Sb 相比具有更显着的影响。而且,植物根提高了细菌共生网络的稳定性,并显着改变了临界属。该过程影响了土壤中的细菌生命活动和养分循环,代谢特征的显着差异进一步支持了这一结论。本研究表明,在 Sb/As 共同污染区,根际效应显着改变了土壤重金属含量和比例、土壤特性以及微生物群落和代谢概况。

更新日期:2023-05-27
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