Heterotrophic diazotrophs in a eutrophic temperate bay (Jiaozhou Bay) broadens the domain of N2 fixation in China's coastal waters
Heterotrophic diazotrophs in a eutrophic temperate bay (Jiaozhou Bay) broadens the domain of N2 fixation in China's coastal waters
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富营养化温带海湾（胶州湾）的异养固氮生物拓宽了中国沿海水域的固氮范围
DOI：
10.1016/j.ecss.2020.106778
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Yusheng Qiu
中科院分区：
文献类型：
--
作者：
Danyang Li;Hongmei Jing;Run Zhang;Weifeng Yang;Min Chen;Bo Wang;Minfang Zheng;Yusheng Qiu
在全球海洋氮循环中，沿海沃茨的N2固定是一个被忽视的过程，但其机制和控制仍然知之甚少。本研究首次于2015 - 2017年对富营养化温带海湾（西黄海胶州湾）的固氮速率、初级生产力、叶绿素（Chla）浓度、有机碳浓度和固氮基因（nifH）组成进行了同步测量。在大多数站位观测到N2固定活性（未检测到-1.53 nmol N L−1h−1），表明胶州湾富氮条件并没有阻止N2固定。JB中的固氮菌主要是异养固氮菌，而> 10 μm的固氮菌则是固氮菌的主要贡献者，这表明异养固氮菌可能在大颗粒或非营养性聚集体上进行主动固氮。春季土壤N2固定与有机碳浓度呈正相关。进一步估算了胶州湾浮游植物源有机碳水平及其与N2固定的潜在关系，结果表明，浮游植物过程可能通过提高有机碳的生物有效性或/和提供适宜的N2固定环境条件来促进胶州湾的N2固定。我们的研究结果首次推断了物理因子和生物过程对固氮的共同调节作用。胶州湾已受到人为无机营养盐污染的影响，研究结果为揭示人为干扰下胶州湾近岸沃茨N2固定及其相关的生态地球化学过程提供了重要依据.
N2fixation in coastal waters represents an overlooked process in the global marine nitrogen cycle, yet the mechanisms and controls are still poorly understood. This study first conducted simultaneous measurements of N2fixation rates, primary production, chlorophylla(Chla) concentration, organic carbon concentration, and the composition of nitrogen-fixing genes (nifH)in a eutrophic temperate bay (Jiaozhou Bay, the western Yellow Sea) from 2015 to 2017. The activity of N2fixation (not detected–1.53 nmol N L−1h−1) were observed at most sampling stations, suggesting that the N-replete conditions in Jiaozhou Bay did not prevent N2fixation. The major N2fixers in JB were heterotrophic, while N2fixation were mainly contributed by > 10 μm fraction, indicating the possible active N2fixation of heterotrophic diazotrophs on large particles or planktonic aggregates. Positive correlations between N2fixation and organic carbon concentration were observed in spring. Further estimates of the level of phytoplankton-derived organic carbon and its potential relationship with N2fixation suggest that phytoplankton processes may stimulate N2fixation in Jiaozhou Bay by increasing the bioavailability of organic carbon or/and providing suitable environmental conditions for N2fixation. Our results first infer the co-regulation of physical factors and biological processes on N2fixation. As Jiaozhou Bay has been subject to anthropogenic pollution of inorganic nutrients, our results provide insights into the dominant controls on N2fixation and relevant biogeochemical processes in coastal waters under anthropogenic disturbance.
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DOI：
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发表时间：
2014
期刊：
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作者：
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2011
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10.1038/s41396-018-0259-x
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2019-01
期刊：
The ISME journal
影响因子：
--
作者：
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2.8
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Mao‐Xu Zhu;Xiang-Li Huang;Guipeng Yang;Liang-Jin Chen
DOI：
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发表时间：
2013
期刊：
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H. Farnelid