Bridging local processes and broad-scale patterns in aquatic biogeochemistry under rapid environmental changes

在快速环境变化下连接水生生物地球化学的局部过程和大尺度模式

• 批准号: RGPIN-2016-06476
• 负责人: Lapierre, JeanFrancois
• 金额: $ 2.04万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=656625
• 关键词: Bridging; local; processes; broad; scale

Aquatic ecosystems are biogeochemical hotspots in a complex landscape that undergoes rapid natural and human-driven changes in land-use, land-cover, hydrology, and climate. The pathways by which these changes affect aquatic ecosystem functioning, however, remain poorly understood due to the scale disconnect that limits knowledge transfer between local, process-based studies and broad-scale, pattern-based studies in aquatic biogeochemistry. Conducting research at the interface of landscape ecology and aquatic biogeochemistry, I propose to develop scaling principles that will allow to bridge local processes and broad-scale patterns in aquatic carbon and nutrient cycling. The main focus is on the coupling between ecological and biogeochemical processes along common environmental gradients that dictate the temporal and spatial patterns in aquatic dissolved organic matter (DOM), a master variable with direct and indirect influence on virtually every process occurring in the water column of lakes and rivers. The main objectives of the program are to: 1) determine the effects of changing DOM stoichiometry on aquatic biogeochemistry across temporal hydrological gradients, 2) assess the scalability of hydrological patterns across spatial landscape gradients and 3) compare the effects of climate, land cover and land use on DOM patterns at continental scale. Relying on the fast-growing development of analytical methods, collaboration networks, modeling capacity and automated sensors, my program will combine a temporal and a spatial field work components around the Université de Montréal field station facilities in the Laurentians region, Québec, with the analysis of existing limnological and geographical data assembled for over 50 000 lakes across the NE US, Ontario and Québec. This program represents a crucial step toward disentangling the pathways through which rapid changes in climate and land-use drive the fate of terrestrial carbon and nutrients in continental watersheds. This understanding, in turn, will allow scientists and managers to better forecast the response of lakes and rivers to complex and interacting changes in climate, land-cover, land-use and hydrology, and thus to target the most pressing issues for landscape management from local to continental scales.

水生生态系统是复杂景观中的生物地球化学热点，在土地利用、土地覆盖、水文和气候方面经历着自然和人类驱动的快速变化。然而，由于规模脱节限制了水生生物地球化学中基于过程的局部研究和基于模式的大规模研究之间的知识转移，人们对这些变化影响水生生态系统功能的途径仍然知之甚少。通过在景观生态学和水生生物地球化学的交叉领域进行研究，我建议制定尺度原则，以弥合水生碳和养分循环的局部过程和大尺度模式。主要关注点是沿着共同环境梯度的生态和生物地球化学过程之间的耦合，这些过程决定了水生溶解有机物（DOM）的时间和空间模式，DOM是一个主变量，对湖泊和河流水柱中几乎所有过程都有直接和间接影响。该计划的主要目标是：1）确定改变 DOM 化学计量对跨时间水文梯度的水生生物地球化学的影响，2）评估跨空间景观梯度的水文模式的可扩展性，3）比较气候、土地覆盖和土地利用对大陆尺度 DOM 模式的影响。依靠分析方法、协作网络、建模能力和自动化传感器的快速发展，我的项目将结合魁北克省劳伦琴地区蒙特利尔大学野外站设施周围的时间和空间野外工作组件，以及对美国东北部、安大略省和魁北克省 50 000 多个湖泊收集的现有湖泊学和地理数据的分析。该计划代表着朝着理清气候和土地利用的快速变化驱动大陆流域陆地碳和养分命运的途径迈出的关键一步。这种理解反过来将使科学家和管理者能够更好地预测湖泊和河流对气候、土地覆盖、土地利用和水文等复杂且相互作用的变化的反应，从而针对从地方到大陆尺度的景观管理最紧迫的问题。