Source, transformation and fate of organic matter in boreal forest watersheds

北方森林流域有机物的来源、转化和归宿

• 批准号: RGPIN-2018-05383
• 负责人: Ziegler, Susan
• 金额: $ 3.72万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=713654
• 关键词: Source; transformation; fate; organic; matter

Boreal landscapes cover most of Canada, encompass the majority of the watershed feeding large Arctic rivers, and are predicted to undergo some of the largest climate changes globally this century. Natural organic matter in soil and aquatic systems of boreal regions represents an important global store of carbon as well as source of nutrients and energy for boreal ecosystems. However, increases in land derived organic matter transported by boreal rivers has been observed over the past few decades suggesting climate-induced alterations of these high-latitude landscapes with repercussions for downstream aquatic and marine ecosystems. For example, this organic matter absorbs light and binds metals - both features that can greatly impact algal productivity in the aquatic and marine environment. My group's previous research supported by NSERC has indicated that the moist boreal forest landscapes of Canada can maintain their stores of soil carbon despite large losses to the atmosphere and increased mobilization of dissolved organic matter that occurs with climate warming in these ecosystems. Climate driven changes in these forests appear to be tightly linked with more long-term ecosystem effects that alter both mosses and soil properties relevant to how these forests will respond to future warming and in turn impact critical feedbacks on our climate. Our research has also enabled the development of new analytical tools with which to track organic matter from these forest sources through both fresh and marine waters enabling us to following important carbon and nutrient stocks from source to sink. By continuing our research along a well establish climate gradient of boreal forest watersheds, over the next five years, this program will focus on the transformation and fate of these land derived organic matter pools on route to and through the aquatic and into the marine environment. By studying these organic matter pools from headwater streams through rivers and their mouths in the coastal environment we will connect the boreal landscape to downstream aquatic and marine ecosystems. In doing so this research will improve our understanding of climate change impacts on: (1) boreal ecosystem function (carbon, nutrient cycling and food webs); and (2) climate-carbon feedbacks within boreal watersheds and their associated coastal environments. This understanding will provide important findings relevant to the management of natural resources including forests and fisheries in Canada by identifying how key factors controlling forest and marine productivity will respond to climate change.

北方景观覆盖了加拿大的大部分地区，包括大部分的流域喂养大型北极河流，并预计将经历一些最大的气候变化全球世纪。北方地区土壤和水生系统中的天然有机物是全球重要的碳储存库，也是北方生态系统营养和能量的来源。然而，在过去的几十年里，已经观察到北方河流输送的陆源有机物的增加，这表明气候引起的这些高纬度景观的变化对下游水生和海洋生态系统的影响。例如，这种有机物质吸收光并结合金属-这两种特征都可以极大地影响水生和海洋环境中的藻类生产力。 我的小组以前由NSERC支持的研究表明，加拿大潮湿的北方森林景观可以保持其土壤碳的储存，尽管大量损失到大气中，并增加了溶解的有机物的动员，随着气候变暖发生在这些生态系统中。 这些森林中气候驱动的变化似乎与更长期的生态系统效应密切相关，这些效应改变了苔藓和土壤特性，这些特性与这些森林如何应对未来变暖有关，并反过来影响对我们气候的关键反馈。我们的研究还开发了新的分析工具，通过淡水和海洋沃茨追踪这些森林来源的有机物，使我们能够从源头到汇跟踪重要的碳和营养物质。 通过继续我们的研究沿着一个良好建立的气候梯度的北方森林流域，在未来五年内，该计划将集中在这些土地来源的有机物池的转化和命运的路线，并通过水生和海洋环境。 通过研究这些有机物池从源头溪流通过河流和他们的嘴在沿海环境中，我们将连接北方景观下游水生和海洋生态系统。在这样做的过程中，这项研究将提高我们对气候变化影响的理解：（1）北方生态系统功能（碳，营养循环和食物网）;（2）北方流域及其相关沿海环境中的气候碳反馈。 这一认识将通过确定控制森林和海洋生产力的关键因素如何应对气候变化，提供与加拿大森林和渔业等自然资源管理有关的重要结论。