当前位置: X-MOL 学术J. Great Lakes Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Assessment of nitrogen fixation rates in the Laurentian Great Lakes
Journal of Great Lakes Research ( IF 2.4 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.jglr.2021.07.005
Kaela E. Natwora 1 , Cody S. Sheik 1, 2
Affiliation  

Nitrogen fixation (NFix) is an important, yet understudied, microbial process in aquatic ecosystems, especially in the Laurentian Great Lakes (LGL). To date, a dearth of nitrogen fixation rate measurements exists in the LGL, are from temporally isolated studies, and were collected primarily from near-shore and surface water environments. Evidence of nitrogen accumulation across the Laurentian Great Lakes suggest that we do not have a firm grasp on nitrogen cycling in large lakes. Thus, we sought to quantify the spatial variability of NFix in the LGL. We found lakes are significantly different in NFix rates from one another and that rates are depth dependent. Overall mean surface NFix rates of Lakes Superior, Michigan, Huron, Erie and Ontario were 0.024, 0.020, 0.069, 0.145, and 0.078 (nmol N2/L/hr), respectively. Likewise, we found the Western, Central and Eastern basins of Lake Erie are significantly different in NFix rates (0.1540, 0.1032, 0.0738 nmol N2/L/hr). However, we found no significant difference in NFix rates between near and offshore sites in Lake Erie, which may have been biased due to a cyanobacterial bloom containing a nitrogen-fixing Dolichospermum sp. Linear regression models indicate NFix is generally positively correlated with chlorophyll-a concentration and negatively correlated with oxidized nitrogen species concentrations. However, Lakes Erie and Huron exhibited a positive linear relationship with oxidized nitrogen, suggesting that NFix may persist to meet cellular and community nitrogen demands. Together, our data highlight NFix is important despite the presence of abundant nitrogen in all LGL.



中文翻译:

劳伦大湖中固氮率的评估

固氮 (N Fix ) 是水生生态系统中一个重要但尚未得到充分研究的微生物过程,尤其是在劳伦大湖 (LGL)。迄今为止,LGL 中缺乏固氮率测量值,这些测量值来自时间隔离的研究,并且主要是从近岸和地表水环境中收集的。Laurentian Great Lakes 中氮积累的证据表明,我们对大型湖泊中的氮循环没有把握。因此,我们试图量化LGL中 N Fix的空间可变性。我们发现湖泊在 N Fix率方面有显着差异,而且该率取决于深度。整体平均表面 N Fix苏必利尔湖、密歇根湖、休伦湖、伊利湖和安大略湖的比率分别为 0.024、0.020、0.069、0.145 和 0.078 (nmol N 2 /L/hr)。同样,我们发现伊利湖的西部,中部和东部盆地的N显著不同的修复率(0.1540,0.1032,0.0738纳摩尔ñ 2 / L /小时)。然而,我们发现在N无显著差异修复在伊利湖附近,海上风场,这可能已偏向利率之间由于含有固氮蓝藻开花Dolichospermum SP。线性回归模型表明 N Fix通常与叶绿素a正相关浓度并与氧化氮物质浓度呈负相关。然而,伊利湖和休伦湖与氧化氮呈正线性关系,表明 N Fix可能会持续满足细胞和社区对氮的需求。总之,我们的数据强调 N Fix很重要,尽管所有 LGL 中都存在丰富的氮。

更新日期:2021-09-19
down
wechat
bug