丁雅楠,那红,祁建华

• 1:中国海洋大学海洋环境与生态教育部重点实验室
• 2:青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室

摘要(Abstract)：

本文于2021年夏季在黄海近岸采集表层海水进行室内培养实验。通过添加不同浓度铁、铜以及沙尘来研究沙尘中铁、铜对海洋表层优势浮游细菌丰度的影响。结果表明，在近海富营养区，铁的添加在培养前期可短暂促进优势细菌丰度的增加(为对照组的1.33～6.58倍),其中低浓度铁的促进作用最显著(P<0.05),主要是通过影响优势细菌对溶解无机氮(Dissolved Inorganic Nitrogen, DIN)、溶解态有机物(Dissolved Organic Matter, DOM)和Fe的吸收利用以及对Cu的释放，进而促进细菌生长。铜的添加能在培养后期抑制优势细菌的丰度，其细菌丰度与对照组相比下降2%～53%,高浓度铜对细菌的抑制作用强于低浓度铜，主要通过影响细菌对溶解态有机氮(Dissolved Organic Nitrogen, DON)和Cu的吸收利用以及对NO~-_2+NO~-_3、溶解态有机碳(Dissolved Organic Carbon, DOC)和Fe的释放速率，进而影响其生长。沙尘添加对黄海表层近海优势浮游细菌的生长总体上先抑制(比对照组低1%～19%)后促进(比对照组高15%～60%),低浓度沙尘在培养后期对细菌丰度的促进作用显著(P<0.05),沙尘主要通过影响细菌对DIN和DON的吸收释放来影响细菌生长。研究显示，亚洲沙尘沉降对近海富营养区域浮游细菌生长有影响，尤其在培养后期，但这种影响效应不仅仅是铁的促进作用与铜的抑制作用的结果，而是沙尘中营养盐、DOC以及微量金属共同影响的作用。研究结果可为深入探讨沙尘沉降对海洋浮游细菌的影响及其作用机制提供科学参考。

关键词(KeyWords)： 沙尘;铁;铜;优势浮游细菌;黄海近岸

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41775148,U1906215)资助~~

作者(Author): 丁雅楠,那红,祁建华

DOI: 10.16441/j.cnki.hdxb.20220141

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