在水耕种沉积物老化过程中,无机硫和重金属的溶解氧驱动转化
1Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, Shandong, People's Republic of China.
Environmental geochemistry and health
|August 16, 2025
概括
海洋养殖沉积物中的低溶解氧 (DO) 加快了酸挥发硫化物 (AVS) 的形成,并增加了硫化物驱动的环境风险. 管理沉积物氧化还原条件对于减轻这些生态危害至关重要.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 溶解氧 (DO) 是海洋养殖沉积物中生物地球化学过程的关键调节剂.
- 在沉积物老化过程中,DO对硫金属相互作用的综合作用尚不清楚.
- 了解这些相互作用对于管理海洋养殖环境至关重要.
研究的目的:
- 为了研究在不同DO水平下,海洋养殖沉积物中减少的无机硫 (RIS) 和重金属的迁移和转化.
- 为了阐明DO对硫的特异化和金属流动性的影响.
- 评估DO,微生物群落和沉积物生物地质化学之间的关系.
主要方法:
- 鱼类养殖沉积物受到受控的,不同水平的溶氧 (DO) 的影响.
- 分析了减少的无机硫 (RIS) 和重金属物种化.
- 评估了微生物群落的丰富性,多样性和组成.
- 进行了相关性分析,以链接DO,硫物种,金属分数和微生物数据.
主要成果:
- 较低的DO水平加快了RIS池中的酸挥发硫化物 (AVS) 的主导地位.
- DO的变化对金属的整体流动性影响很小,但对特定的金属部分 (Cu,Pb) 影响很大.
- 沉积物微生物的丰富性和多样性随着DO的减少而下降,改变了细菌社区结构.
- 减少的DO通过加强动员,加剧了无机硫化物对环境的危害.
结论:
- 溶解的氧气显著影响水产养殖沉积物中的硫转化,较低的DO促进危险的硫化物形成.
- 虽然DO对金属的整体流动性影响较小,但特定的金属碎片对DO水平敏感.
- 微生物群落受到DO枯竭的显著改变,影响了沉积物的生物地质化学.
- 积极管理沉积物氧化还原条件,特别是在低氧期,对于减轻与硫化物调动相关的生态风险至关重要.
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