Investigating the role of soil microbial processes in aquatic greenhouse gas emissions in Eastern Canadian permafrost landscapes

研究土壤微生物过程在加拿大东部永久冻土景观水生温室气体排放中的作用

• 批准号: 560895-2020
• 负责人: Douglas, Peter
• 金额: $ 2.19万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=706993
• 关键词: Investigating; role; soil; microbial; processes

Greenhouse gas (GHG) emissions from thawing permafrost represent a major potential positive feedback to global warming, but our understanding of the biological, geochemical, and hydrological mechanisms controlling these emissions remains limited. Recent research points to aquatic environments (lakes and ponds) as hotspots of GHG emissions, but the pathways through which permafrost soil carbon contributes to aquatic GHG emissions remain unclear. Currently there is a lack of research integrating microbiological, biogeochemical, and hydrological processes in soils and aquatic environments in permafrost landscapes, which this interdisciplinary project aims to address. We will study these processes in ecosystems in Eastern Canada representing both continuous and discontinuous permafrost. Our FRQNT-funded research project focuses on (1) characterizing relationships between microbial communities, organic matter (OM), and GHG fluxes across soil to aquatic environmental gradients through field sampling and (2) identifying the mechanisms controlling linkages between microbial communities and GHG fluxes using incubation experiments. Our team comprises strong expertise in carbon cycle biogeochemistry (Peter Douglas- McGill), Arctic aquatic ecology (Isabelle Laurion-INRS), soil microbiology (Cynthia Kallenbach- McGill), microbial genomics (Jérôme Comte- INRS), and nutrient biogeochemistry (Roxane Maranger- Université de Montréal). New funding from the NSERC NOVA program will facilitate collaboration with a hydrologist (Melissa Lafrenière-Queens), broadening the research program to focus on specific mechanisms of hydrological transport of organic matter, microbes, and nutrients from soils to ponds. This will include examination of the role of summer rainfall and different size classes of organic matter in controlling soil-pond carbon fluxes. It will also facilitate a comparative analysis of rapidly eroding gullies with permafrost thaw ponds in terms of their potential for mobilizing permafrost carbon reservoirs. This new funding study will provide key insights into mechanistic linkages between soil microbiology, hydrology, and permafrost GHG emissions.

融化多年冻土的温室气体（GHG）排放代表了全球变暖的主要潜在积极反馈，但是我们对控制这些发射的生物学，地球化学和水文机制的理解仍然有限。最近的研究表明，水生环境（湖泊和庞斯）是温室气体排放的热点，但是多年冻土土壤碳导致水生温g的排放的途径尚不清楚。当前，缺乏整合多年冻土景观土壤和水生环境中的微生物，生物地球化学和氢过程的研究，该跨学科项目旨在解决这些过程。我们将在加拿大东部的生态系统中研究这些过程，代表连续和不连续的多年冻土。我们的FRQNT资助研究项目的重点是（1）表征微生物群落，有机物（OM）和通过现场采样到水上环境梯度之间的关系之间的关系，以及（2）使用孵化实验确定控制微生物群落和GHG通量之间的联系的机制。我们的团队在碳循环生物地球化学（Peter Douglas-McGill），北极水生生态学（Isabelle Laurion-Inrs），土壤微生物学（Cynthia Kallenbach-McGill），微生物基因组学（Jérômemmememmecomte-inrs and nutrientiant（Roxane deRrientiant）（Roxane Bioxane）（Roxane norrientiant）（Roxane Bioxane），我们的团队具有强大的专业知识。蒙特利尔）。 NSERC NOVA计划的新资金将有助于与水文学家（MelissaLafrenière-Queens）合作，扩大研究计划，以关注有机物，微生物和营养物质的特定机制，从土壤到池塘。这将包括检查夏季降雨的作用以及不同规模的有机物在控制土壤碳通量中的作用。它还将促进对迅速侵蚀的沟壑的比较分析，这些沟渠具有多年冻结池塘，以动员多年冻土碳储层的潜力。这项新的资金研究将为土壤微生物学，水文学和多年冻土温室气体排放之间的机械联系提供关键的见解。