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Inorganic and organic additives differently regulate compost microbiomes in response to heavy metals immobilization

文献类型： 外文期刊

作者： Li, Tuo 1 ; Yan, Zhangxin 1 ; Sun, Yu 1 ; Hu, Xuan 1 ; Peng, Chenglin 4 ; Zhao, Shujun 4 ; Xu, Dabing 4 ; Liu, Dongyang 1 ; Shen, Qirong 1 ;

作者机构： 1.Key Lab Organ Based Fertilizers China, Nanjing, Peoples R China

2.Jiangsu Prov Key Lab Solid Organ Waste Utilizat, Nanjing, Peoples R China

3.Nanjing Agr Univ, Nanjing 210095, Jiangsu, Peoples R China

4.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Natl Agr Expt Stn Soil Qual, Wuhan 430064, Peoples R China

关键词： Composting; Heavy metals; Bioavailability; Shell powder; Biochar; Microbial community responses

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2024 年 502 卷

页码：

收录情况： SCI

摘要： Various composting additives, both organic and inorganic, have been used to effectively reduce the bioavailability of heavy metals (HMs) in compost. However, a comprehensive assessment of their comparative contributions and the mechanisms involved is still lacking. In this study, we selected shell powder and biochar as representative amendments to assess their efficacy in immobilizing various HMs. Our results demonstrated that the addition of shell powder and biochar markedly enhanced the synthesis of humic acids (HA), reduced the bioavailability of HMs, and indirectly enhanced microbial carbon metabolism and growth pathways. This enhancement subsequently enriched the abundance of key HA synthesis contributors, including Enterobacter, Thermobispora, Pseudomonas, and Sphingobacterium, creating a positive feedback loop. Additionally, adding biochar altered the abundance of Pseudomonas, Chelatococcus, and Pseudoxanthomonas during the mesophilic phase, thereby reducing the expression of HMs resistance genes (HMRGs). In contrast, shell powder supplementation modulated the response to HMRGs reduction by regulating the abundance of Sphingobacterium, Pseudomonas, and Thermobispora during the thermophilic phase. Ultimately, regional cultivation trials confirmed the potential of these innovative organic fertilizers to significantly reduce the spread of HMs to plants. Collectively, these findings highlighted the similarities and differences between organic and inorganic additives to modulate microbial community responses during HMs immobilization, providing a theoretical framework for diminishing the risks associated with HMs dissemination and improving the quality of organic fertilizers.

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