Purpose

Long-term weathering promotes the development of the microbial communities and increased microbial diversity in bauxite residue. However, the effect of different vegetation cover on the diversity and stability of microbial community are still poorly understood.

Methods

In this study, residue samples from three typical vegetation cover including Artemisia (BA), Cynodon (BC), and Hedysarum (BH) were collected in a bauxite residue disposal areas (BRDA). Illumina high-throughput sequencing technology was applied to determine the microbial communities in bauxite residue.

Results

Residues in vegetated sites exhibited lower alkalinity and higher nutrients level, as well as higher microbial biomass and activities, suggesting that plant encroachment significantly increased multifunctionality in bauxite residue. In addition, plant encroachment also induced the development of microbial communities and increased microbial and enhanced network stability. Furthermore, our results showed that the microbial diversity and network stability were significantly positive correlated with multifunctionality in bauxite residue. Long-term plant encroachment promoted functional bacterial assemblages (mostly Rhizobiaceae, Blastocatellaceae, Acidobacteriaceae, Sphingonmonadaceae, Frankiaceae), which were also the core species in microbial network.

Conclusions

Plant encroachment could increase microbial diversity and network stability, thus promote the elevation of multifunctionality in bauxite residue. Rhizobiaceae, Blastocatellaceae, Acidobacteriaceae, Sphingonmonadaceae, Frankiaceae played important roles in the promotion of multifunctionality in bauxite residue. Our results highlight the necessity of conserving and augmenting the abundance of functional bacterial assemblages to ensure the stable provision of ecosystem functions in bauxite residue disposal areas.

中文翻译：

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植物侵占通过构建多样化和稳定的微生物群落增加了铝土矿残渣的多功能性

 目的

长期风化促进了微生物群落的发展，增加了铝土矿残渣中微生物的多样性。然而，不同植被覆盖对微生物群落多样性和稳定性的影响仍知之甚少。

 方法

在这项研究中，从铝土矿残留物处置区（BRDA）收集了三种典型植被的残留物样品，包括蒿（BA）、狗牙根（BC）和岩黄芪（BH）。应用Illumina高通量测序技术测定铝土矿残渣中的微生物群落。

 结果

植被地区的残渣表现出较低的碱度和较高的营养水平，以及较高的微生物生物量和活性，表明植物的侵占显着增加了铝土矿残渣的多功能性。此外，植物的侵占还诱导了微生物群落的发展，增加了微生物数量，增强了网络的稳定性。此外，我们的结果表明，微生物多样性和网络稳定性与铝土矿残渣的多功能性呈显着正相关。长期的植物侵占促进了功能性细菌群落的形成（主要是根瘤菌科、芽生菌科、酸杆菌科、鞘氨醇单胞菌科、弗兰克氏菌科），也是微生物网络的核心物种。

 结论

植物侵占可以增加微生物多样性和网络稳定性，从而促进铝土矿渣多功能性的提高。根瘤菌科、芽孢杆菌科、酸杆菌科、鞘氨醇单胞菌科、弗兰克氏菌科在促进铝土矿渣多功能化方面发挥了重要作用。我们的结果强调了保护和增加功能性细菌组合丰度的必要性，以确保铝土矿残渣处置区生态系统功能的稳定提供。