Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting

doi:10.1016/S2095-3119(20)63300-7

Journal of Integrative Agriculture ›› 2021, Vol. 20 ›› Issue (5): 1137-1146.DOI: 10.1016/S2095-3119(20)63300-7

所属专题：农业经济与管理合辑Agricultural Economics and Management

收稿日期:2020-04-13 出版日期:2021-05-01 发布日期:2021-04-12

Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting

CUI Hu^{1, 2, 3}, OU Yang^{1, 2}, WANG Li-xia^{1, 2}, YAN Bai-xing^{1, 2}, LI Ying-xin^{1, 2, 3}, DING Da-wei^{1, 2}

¹ Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, P.R.China
² Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, P.R.China
³ University of Chinese Academy of Sciences, Beijing 100049, P.R.China

Received:2020-04-13 Online:2021-05-01 Published:2021-04-12
Contact: Correspondence WANG Li-xia, E-mail: lxwang@neigae.ac.cn; YAN Bai-xing, E-mail: yanbx@neigae.ac.cn
About author:CUI Hu, E-mail: cuihu@iga.ac.cn;
Supported by:
This research was financially supported by the National Key Research and Development Program of China (2018YFD0500205) and the Strategic Priority Research Program of the Chinese Academy Sciences (XDA23070502).

摘要/Abstract

摘要：

堆肥过程中磷矿粉影响微生物群落进而钝化重金属的机制相关研究较少。本研究通过分析猪粪秸秆堆肥过程中微生物群落结构及重金属形态变化，探明磷矿粉作用下微生物对重金属钝化机制。结果表明磷矿粉的添加能够提高堆肥过程中重金属的钝化效果，特别是对于Cd和Zn，生物有效性系数分别降低了247.41和176.25%。随着堆肥的进行，细菌群落结构发生变化，Firmicutes 所占比例降低，而Proteobacteria, Bacteroidetes, Deinococcus-Thermus 和Gemmatimonadetes所占比例升高。磷矿粉的添加使原生的细菌门类发生变化，Bacteroidetes变化可以解释Zn，Cu和Cr的形态变化，而 Deinococcus-Thermus和Proteobacteria影响Zn, Pb和Cd钝化。该研究结果能为堆肥过程中的重金属钝化提供支持。

Abstract:

Available information on the microbial mechanisms associated with heavy metal (HM) passivation during co-composting amended with phosphate rock (PR) remains limited. Thus, this study investigated the dynamic changes in bacterial communities and HM-fractions (Zn, Cu, Cd, Cr and Pb) during swine manure composting with maize straw, and ascertained the bacterial influence on HM-passivation. The results demonstrated that the addition of PR improved HM-passivation, especially for Zn and Cd, with their bioavailability factors (BFs) reduced by 247.41 and 176.25%, respectively. As for bacterial communities, the proportion of Firmicutes decreased, while the proportions of Proteobacteria, Bacteroidetes, Deinococcus-Thermus and Gemmatimonadetes increased in all treatments. PR significantly changed the primary bacterial phyla in the thermophilic phase. Bacteroidetes were the main bacterial component controlling the passivation of Zn, Cu and Cr, while Deinococcus-Thermus mainly regulated the mobility of Zn and Pb, and Proteobacteria only dominated the transformation among Cd-fractions. These results may provide a reference for the use of HM-passivation techniques during composting.

Key words: aerobic composting , heavy metals , bacterial community , phosphate rock

. [J]. Journal of Integrative Agriculture, 2021, 20(5): 1137-1146.

CUI Hu, OU Yang, WANG Li-xia, YAN Bai-xing, LI Ying-xin, DING Da-wei. Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting[J]. Journal of Integrative Agriculture, 2021, 20(5): 1137-1146.

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Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting

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