Department of Agricultural Chemistry, National Taiwan University, Taipei 106319, Taiwan; Department of Biomedical Sciences, Graduate Institute of Molecular Biology, National Chung Cheng University, 168 University Road, Chiayi County, Ming-Shung, 62102, Taiwan; Doctoral Program in Science, Technology, Environment, and Mathematics, Department of Earth and Environmental Sciences, National Chung Cheng University, 168 University Rd., Chiayi County, Min-Hsiung, 62102, Taiwan.
Environmental Science Laboratory, Department of Chemistry, Biological Laboratory, School of Applied Sciences, KIIT Deemed to be University, Bhubaneswar, Odisha 751024, India.
Mar Pollut Bull. 2024 Dec;209(Pt A):117035. doi: 10.1016/j.marpolbul.2024.117035. Epub 2024 Oct 10.
Mangroves, essential coastal ecosystems, are threatened by human-induced Potentially-toxic-elements (PTEs) pollution. This study analyzed PTEs distribution, phytoremediation potential, and rhizosphere microbial communities in Taiwan's Xinfeng mangrove forest. Significant variations in physicochemical and PTEs concentrations were observed across adjacent water bodies, with moderate contamination in the river, estuary, and overlying water of mangroves sediment. The partition-coefficient showed the mobility of Bi, Pb, Co, and Sr at the water-sediment interface. The geochemical-indices revealed high Bi and Pb contamination and moderate Zn, Sr, Cu, and Cd contamination in sediment. The overall pollution indices indicated the significant contamination, while moderate ecological risk was found for Cd (40 ≤ E < 80). Mangroves Kandelia obovata and Avicennia marina exhibited promising PTEs phytoremediation potential (Bi, Cd, Mn, Sr, and Co). Metagenomics indicated a diverse microbial community with N-fixation, P-solubilization, IAA synthesis, and PTEs-resistance genes. These findings underscore the need for targeted conservation to protect these critical habitats.
红树林是重要的沿海生态系统，受到人为潜在有毒元素（PTEs）污染的威胁。本研究分析了台湾新丰红树林的 PTEs 分布、植物修复潜力和根际微生物群落。相邻水体的理化性质和 PTEs 浓度存在显著差异，河、河口和红树林沉积物的上覆水中存在中度污染。分配系数显示了 Bi、Pb、Co 和 Sr 在水-沉积物界面的迁移性。地球化学指标显示，沉积物中 Bi 和 Pb 污染严重，Zn、Sr、Cu 和 Cd 污染中度。整体污染指数表明存在显著污染，而 Cd（40≤E<80）则存在中度生态风险。红树植物桐花树和海桑表现出良好的 PTEs 植物修复潜力（Bi、Cd、Mn、Sr 和 Co）。宏基因组学表明，微生物群落具有固氮、解磷、IAA 合成和 PTEs 抗性基因等多种功能。这些发现强调了需要进行有针对性的保护，以保护这些关键栖息地。
