Collaborative Research: Predicting Controls of Partitioning between Dissimilatory Ntirate Reduction to Ammonium (DNRA) and Dinitrogen Production in Marine Sediments

合作研究:预测海洋沉积物中异化硝酸盐还原成铵(DNRA)和氮生成之间的分配控制

基本信息

  • 批准号:
    1635099
  • 负责人:
  • 金额:
    $ 37.02万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2016
  • 资助国家:
    美国
  • 起止时间:
    2016-09-01 至 2021-08-31
  • 项目状态:
    已结题

项目摘要

Microbial processes in marine sediments play a major role in the global nitrogen cycle. Because the presence of nitrogen compounds dissolved in seawater largely controls biological growth, understanding how the sedimentary nitrogen budget changes with altered circulation, acidity, and biological productivity is of critical importance to predict oceanic function in future climate scenarios. Surprisingly, we do not know definitively if nitrogen exchange between sediments and the water column is in balance, and if not, how it varies over time and space. We do know that two bacterially mediated chemical reactions are primarily responsible for removing nitrogen from marine ecosystems by converting biologically usable forms of dissolved nitrogen back to nitrogen gas (N2) that is not generally available for biological production. These reactions are called denitrification and anaerobic ammonium oxidation (anammox); the latter operating only where oxygen is zero. This project will investigate a third reaction, called dissimilatory nitrate reduction (DNRA), which competes directly with anammox to limit N2 production and the consequent "loss" of nitrogen, thus retaining nitrogen for use in marine ecosystems. The role of DNRA has not been fully explored and quantifying this reaction could help evaluate the overall nitrogen balance in ocean systems. The researchers here will use novel experimental reactors that contain collected marine sediments and, by varying environmental conditions (pH, temperature, oxygen, organic carbon), will discover and quantify what controls rates of DNRA, denitrification, and anammox in sediments. This will provide a direct test and further development of theoretical sedimentary nitrogen models that can be used to predict possible changes in the global nitrogen cycle resulting with various future climate scenarios. Two graduate students will participate in the research and collaborations with the Maine Coastal Observing Alliance (MCOA) and the Gulf of Maine Institute (GOMI), as well as the Institute for Broadening Participation (IBP) will generate minority student involvement and enhanced outreach activity.This project uses thermodynamic calculations and empirical evidence as a basis to evaluate the ratio of available organic carbon (C) to nitrate (NO3-) as a key controlling factor of nitrogen redox partitioning; with higher ratios believed to favor dissimilatory nitrate reduction (DNRA) over N2 production. The investigator's theoretical model predicts rapid and reversible transitions between DNRA and N2 production over relatively small changes in C/NO3-. This suggests that partitioning could be sensitive to seasonal and possibly inter-annual differences in organic C deposition as well as processes that control nitrate flux to the sediments such as water column stratification. Quantitative relationships between sedimentary C/NO3- and nitrogen partitioning remain poorly defined, and a number of other factors including T, H2S, and Fe(II), are known to influence N partitioning. This study will investigate the hypothesis that relationships between nitrogen redox partitioning and C/NO3-, and by extension H2S/NO3-, are predicted by the proposed theoretical sedimentary nitrogen model. Experiments will varying NO3 fluxes while providing hydrogen sulfide (H2S) and 13C-labelled detritus as electron donors, and measure transformation rates of 15NO3- to 15NH4+ and 29/30N2 in thin disc reactors to determine rates and pathways of DNRA and N2 production. The proposed integration of these experiments with a theoretically-based biogeochemical model will develop a quantifiable and testable understanding of the marine nitrogen cycle. This study should provide a major advance that could be broadly applied to quantitatively predict the sedimentary balance between nitrogen retention and loss across marine ecosystems.
海洋沉积物中的微生物过程在全球氮循环中起着重要作用。由于溶解在海水中的氮化合物的存在在很大程度上控制着生物的生长,了解沉积氮收支如何随着环流、酸度和生物生产力的改变而变化,对于预测未来气候情景下海洋的功能至关重要。令人惊讶的是,我们不能确切地知道沉积物和水柱之间的氮交换是否平衡,如果不是,它是如何随时间和空间变化的。我们确实知道,两种细菌介导的化学反应通过将生物可用的溶解态氮转化为通常无法用于生物生产的氮气(N2),主要负责从海洋生态系统中去除氮。这些反应被称为反硝化和厌氧氨氧化(anammox);后者只在氧为零的情况下工作。该项目将研究第三种反应,称为异化硝酸还原反应(DNRA),它与厌氧氨氧化反应直接竞争,以限制N2的产生和随之而来的氮的“损失”,从而保留氮用于海洋生态系统。DNRA的作用尚未被充分探索,量化这一反应有助于评估海洋系统的总体氮平衡。这里的研究人员将使用含有收集的海洋沉积物的新型实验反应器,并通过不同的环境条件(pH值、温度、氧气、有机碳),发现并量化控制沉积物中DNRA、反硝化和厌氧氨氧化速率的因素。这将为理论沉积氮模型提供直接测试和进一步发展,该模型可用于预测未来各种气候情景下全球氮循环的可能变化。两名研究生将参与缅因海岸观测联盟(MCOA)和缅因湾研究所(GOMI)的研究和合作,扩大参与研究所(IBP)将促进少数民族学生的参与和加强外联活动。本项目以热力学计算和经验证据为基础,评价了有效有机碳(C)与硝态氮(NO3-)的比值是氮氧化还原分配的关键控制因素;较高的比率被认为有利于异化硝酸盐还原(DNRA)而不是N2的产生。研究人员的理论模型预测了DNRA和N2产量之间的快速可逆转变,而C/NO3-的变化相对较小。这表明,分区可能对有机碳沉积的季节和年际差异以及控制硝酸盐流向沉积物的过程(如水柱分层)敏感。沉积C/NO3-与氮分配之间的定量关系仍然不明确,并且已知包括T、H2S和Fe(II)在内的许多其他因素会影响N分配。本研究将通过提出的理论沉积氮模型来预测氮氧化还原分配与C/NO3-之间的关系,进而探讨H2S/NO3-之间的关系。实验将在提供硫化氢(H2S)和13c标记的碎屑作为电子供体的情况下改变NO3通量,并测量15NO3-在薄板反应器中转化为15NH4+和29/30N2的速率,以确定DNRA和N2的生产速率和途径。建议将这些实验与基于理论的生物地球化学模型相结合,将对海洋氮循环产生可量化和可测试的理解。该研究为定量预测海洋生态系统氮保留与损失之间的沉积平衡提供了重要的应用前景。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Anaerobic ammonium oxidation (anammox) and denitrification in Peru margin sediments
  • DOI:
    10.1016/j.jmarsys.2018.09.007
  • 发表时间:
    2020-07
  • 期刊:
  • 影响因子:
    2.8
  • 作者:
    J. J. Rich-J.;P. Arevalo;B. Chang;A. Devol;B. Ward
  • 通讯作者:
    J. J. Rich-J.;P. Arevalo;B. Chang;A. Devol;B. Ward
Similar temperature responses suggest future climate warming will not alter partitioning between denitrification and anammox in temperate marine sediments
  • DOI:
    10.1111/gcb.13370
  • 发表时间:
    2017-01
  • 期刊:
  • 影响因子:
    11.6
  • 作者:
    Lindsay D. Brin;A. Giblin;J. J. Rich-J.
  • 通讯作者:
    Lindsay D. Brin;A. Giblin;J. J. Rich-J.
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Anne Giblin其他文献

Integrating Tide‐Driven Wetland Soil Redox and Biogeochemical Interactions Into a Land Surface Model
将潮汐驱动的湿地土壤氧化还原和生物地球化学相互作用整合到陆地表面模型中
  • DOI:
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    6.8
  • 作者:
    B. Sulman;Jiaze Wang;Sophie LaFond‐Hudson;T. O’Meara;F. Yuan;Sergi Molins;Glenn Hammond;I. Forbrich;Zoe G. Cardon;Anne Giblin
  • 通讯作者:
    Anne Giblin

Anne Giblin的其他文献

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{{ truncateString('Anne Giblin', 18)}}的其他基金

LTER: Plum Island Ecosystems, the impact of changing landscapes and climate on interconnected coastal ecosystems
LTER:普拉姆岛生态系统,景观和气候变化对相互关联的沿海生态系统的影响
  • 批准号:
    2224608
  • 财政年份:
    2022
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Continuing Grant
Collaborative Research: Quantifying the effects of different nitrogen forms on marsh resilience to environmental change
合作研究:量化不同氮形式对沼泽适应环境变化的能力的影响
  • 批准号:
    2203323
  • 财政年份:
    2022
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
Collaborative Research: The Potential Importance of Intracellular Nitrate Cycling in the Nitrogen Cycle in Marine Sediments
合作研究:细胞内硝酸盐循环在海洋沉积物氮循环中的潜在重要性
  • 批准号:
    2148672
  • 财政年份:
    2022
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
Controlled Environment Facilities for the Marine Biological Laboratory
海洋生物实验室受控环境设施
  • 批准号:
    2128820
  • 财政年份:
    2021
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
Collaborative Research: TIDE: Legacy effects of long-term nutrient enrichment on recovery of saltmarsh ecosystems
合作研究:潮汐:长期营养富集对盐沼生态系统恢复的遗留影响
  • 批准号:
    1902695
  • 财政年份:
    2019
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
Collaborative Research: An Exploration of the Direct and Indirect Effects of Climatic Warming on Arctic Lake Ecosystems
合作研究:探索气候变暖对北极湖泊生态系统的直接和间接影响
  • 批准号:
    1603214
  • 财政年份:
    2016
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Continuing Grant
LTER-Plum Island Ecosystems: Dynamics of coastal ecosystems in a region of rapid climate change, sea-level rise, and human impacts
LTER-普拉姆岛生态系统:气候快速变化、海平面上升和人类影响地区沿海生态系统的动态
  • 批准号:
    1637630
  • 财政年份:
    2016
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Continuing Grant
Coastal SEES Collaborative Research: A cross-site comparison of salt marsh persistence in response to sea-level rise and feedbacks from social adaptations
沿海 SEES 合作研究:盐沼持久性对海平面上升的响应和社会适应反馈的跨地点比较
  • 批准号:
    1426308
  • 财政年份:
    2015
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
FSML: Research Space for the Marine Biological Laboratory's Marshview Field Station
FSML:海洋生物实验室 Marshview 现场站的研究空间
  • 批准号:
    1318272
  • 财政年份:
    2013
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Standard Grant
LTER-PIE: Interactions Between External Drivers, Humans and Ecosystems in Shaping Ecological Process in a Mosaic of Coastal Landscapes and Estuarine Seascapes
LTER-PIE:外部驱动因素、人类和生态系统之间的相互作用,塑造沿海景观和河口海景的生态过程
  • 批准号:
    1238212
  • 财政年份:
    2012
  • 资助金额:
    $ 37.02万
  • 项目类别:
    Continuing Grant

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