Carbon gas dynamics in aquatic ecosystems: integrating physical processes and biogeochemical cycling

水生生态系统中的碳气体动力学：整合物理过程和生物地球化学循环

• 批准号: RGPIN-2016-06378
• 负责人: Prairie, Yves
• 金额: $ 4.35万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=616267
• 关键词: Carbon; gas; dynamics; aquatic; ecosystems; Carbon; gas; dynamics; aquatic; ecosystems

The central goal of my research is to establish a solid quantitative framework to assess the role of inland waters in landscape C budgets, from local to global. Recent research by our group and elsewhere has identified CH4 as a significant player. Owing to the much more complex nature of the biogeochemical cycling of methane relative to CO2, estimates of its current contribution to total GHG emissions are still loosely constrained. However, with its high warming potential and temperature sensitivity, its future role is potentially much more important but even less foreseeable. I contend that part the difficulty in assessing and predicting its contribution is the lack of a physical-biogeochemical framework in which to integrate the main fluxes, namely production pathways, transport mechanisms, degree of oxidation and ultimately evasion to the atmosphere. The proposed research program is articulated around several sub-projects focussing on methane dynamics with an emphasis on the role played by physical constraints impinging on the rates of biogeochemical processes. The study will first be conducted on a model lake (L. Croche) and then be extended to a cross section of representative lakes covering gradients of ecosystem size, shape and nutrient status. We will also conduct detailed investigations to further our understanding of a key component of emission, gas exchange (k600), with an emphasis on the ecological role it plays. Together, these components of the research program will provide the necessary framework to better understand CH4 dynamics in lakes that will ultimately lead to the better predictions of CH4 emission from aquatic ecosystems.

我的研究的核心目标是建立一个可靠的定量框架，以评估内陆水域在景观C预算中的作用，从本地到全球。我们小组和其他地方的最新研究将CH4确定为重要的参与者。由于甲烷相对于CO2的生物地球化学循环的更为复杂的性质，因此其当前对总温室气体排放的贡献的估计仍然受到严格限制。但是，由于其高温潜力和温度敏感性，其未来的作用可能更重要，但甚至更不可预见。我认为，评估和预测其贡献的困难是缺乏将主要通量整合的物理生物地球化学框架，即生产途径，运输机制，氧化程度和最终逃避大气。拟议的研究计划围绕着几个关注甲烷动力学的子项目表达，重点是构成生物地球化学过程速度的物理约束所起的作用。该研究将首先在模型湖（L. Croche）上进行，然后扩展到代表性湖泊的横截面，涵盖生态系统大小，形状和养分状态的梯度。我们还将进行详细的研究，以进一步了解排放，天然气交换（K600）的关键组成部分，重点是它发挥的生态作用。总之，研究计划的这些组成部分将提供必要的框架，以更好地了解湖泊中的CH4动力学，最终将更好地预测水生生态系统的CH4排放。