Nitrogen fixation in two coastal upwelling regions of the Taiwan Strait.
Nitrogen fixation in two coastal upwelling regions of the Taiwan Strait.
复制标题
台湾海峡两处沿海上升流区的固氮作用
DOI：
10.1038/s41598-017-18006-5
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发表时间：
2017-12-14
影响因子：
4.6
通讯作者：
Shi D
中科院分区：
文献类型：
--
作者：
Wen Z;Lin W;Shen R;Hong H;Kao SJ;Shi D
最近的研究表明，氮的固定在营养丰富的沿海上升流地区可能是重要的。2015年夏天，我们在台湾海峡巡游时发现，表层水的固氮率从低于检测下限到7.51nmolN L−1D−1。平潭和东山上升流交界处(NE区)表层水的固氮率较高，并伴随着较低的N：P比(1-10.4：1)。相比之下，东山上升流西南部地区(西南部地区)氮充足，磷缺乏，氮磷比高(如C2站的>；43)，这主要是由于珠江羽流的影响。与硅藻相关的共生体(HET-1；104-106拷贝L−1)在所调查的其他重氮营养类群中占主导地位，这可能反映了上升流区新的氮输入和输出之间的直接关系。我们的结果表明，水文对沿海上升流地区的固氮菌群落和固氮作用有一定的影响。
Recent studies have demonstrated that dinitrogen fixation can be important in nutrient-rich coastal upwelling regions. During a cruise to the Taiwan Strait in summer 2015, we found that the nitrogen fixation rate in surface waters ranged from below detection limits to 7.51 nmol N L−1d−1. Higher rates accompanied by low N:P ratios (1–10.4:1) associated with low temperatures occurred in the surface water where the Pingtan and the Dongshan upwelling regions met (the NE area). In contrast, insignificant rates were observed in the southwest area of the Dongshan upwelling region (the SW area) with sufficient N and deficient P, and therefore high N:P ratios (e.g., >43 at station C2) due largely to the influence of the Pearl River plume. Diatom-associated symbionts (het-1; 104–106copies L−1) that are efficient in organic matter export were found to dominate the other diazotrophic groups that were surveyed, which may represent a direct relationship between new nitrogen input and export in the upwelling regions. Our results suggest a hydrographical influence on the diazotroph community and N2fixation in coastal upwelling regions.
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