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Deciphering the functional assembly of microbial communities driven by heavy metals in the tidal soils of Hangzhou Bay

文献类型： 外文期刊

作者： Kong, Dedong 1 ; Xu, Linya 2 ; Dai, Mengdi 1 ; Ye, Ziran 1 ; Ma, Bin 2 ; Tan, Xiangfeng 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Digital Agr, Hangzhou 310021, Peoples R China

2.Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China

3.Nantong Cultivated Land Qual Protect Stn, Nantong 226001, Jiangsu, Peoples R China

关键词： Heavy metal; Nickel; Soil microbiome; Biogeochemical cycles; Microbial function

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.6； 五年影响因子：8.3 ）

ISSN： 0269-7491

年卷期： 2024 年 360 卷

页码：

收录情况： SCI

摘要： Understanding the interaction between heavy metals and soil microbiomes is essential for maintaining ecosystem health and functionality in the face of persistent human-induced challenges. This study investigated the complex relationships between heavy metal contamination and the functional characteristics of soil microbial communities in the tidal soils of Hangzhou Bay, a region experiencing substantial environmental pressure due to its proximity to densely populated and industrialized regions. The north-shore sampling site showed moderate contaminations (mg/kg) of total arsenic (16.61 f 1.13), cadmium (0.3 f 0.05), copper (31.28 f 1.23), nickel (37.44 f 2.74), lead (34.29 f 5.99), and zinc (120.8 f 5.96), which are 1.29-2.94 times higher than the geochemical background values in Hangzhou Bay and adjacent areas. In contrast, the south-shore sampling site showed slightly higher levels of total arsenic (13.76 f 1.35) and cadmium (0.13 f 0.02) than the background values. Utilizing metagenomic sequencing, we decoded microbial functional genes essential for nitrogen, phosphorus, sulfur, and methane biogeochemical cycles. Although soil available nickel content was relatively low at 1 mg/kg, it exhibited strong associations with diverse microbial genes and biogeochemical pathways. Four key genes-hxlB, glpX, opd, and phny-emerged as pivotal players in the interactions with available nickel, suggesting the adaptability of microbial metabolic responses to heavy metal. Additionally, microbial genera such as Gemmatimonas and Ilumatobacter, which harbored diverse functional genes, demonstrated potential interactions with soil nickel. These findings highlight the importance of understanding heavy metal-soil microbiome dynamics for effective environmental management strategies in the tidal soils of Hangzhou Bay, with the goal of preserving ecosystem health and functionality amidst ongoing anthropogenic challenges.

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