Collaborative Research: RUI: Cycling of dissolved organic matter in blue carbon ecosystems

合作研究：RUI：蓝碳生态系统中溶解有机物的循环

• 批准号: 2242994
• 负责人: Catherine Clark
• 金额: $ 37.65万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2242994&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Cycling; dissolved

Blue carbon refers to carbon stored in coastal systems like sea grass meadows and marshes. These ocean plants play an important role in carbon cycling by making, storing and releasing carbon. These plants release carbon as dissolved organic matter into the water. Dissolved organic matter is made of very large carbon-containing molecules with complex structures. It is formed when plant matter, like leaves, breaks down. These dissolved molecules are a part of the global carbon cycle, but we do not know very much about the different types of dissolved organic matter or how it changes over time. This research will study how salt marshes and eel grass beds in Padilla Bay create, alter and store dissolved organic matter. Padilla Bay is a large bay in the coastal waters of Washington state. Measurements will be made of how the amount and type of dissolved organic matter flowing out of the salt marshes and Bay change from high tide to low tide and in different seasons. This research will help scientists understand the role and importance of blue carbon systems in carbon cycling in coastal waters.The proposed activities incorporate a system and process approach to evaluating DOM sources and cycling in salt marshes, mudflats, and eelgrass beds. Surface waters, sediment pore waters and plant leachates will be studied to assess their contributions to DOM cycling using a combination of spectroscopic, stable isotope (C-13), dissolved organic carbon, water quality and hydrodynamic measurements. The primary goal is to examine the composition, photochemical and biological transformations, and amount of DOM exported from a salt marsh into the Padilla Bay estuary. Secondary goals are to assess how carbon flow is modified by eelgrass beds and mudflats in the estuary. Padilla Bay has several degraded salt marshes slated for restoration, and DOM will also be studied in these systems, providing a baseline for monitoring carbon flow changes at different stages of marsh restoration in the future. This study will help researchers make better predictions about changes in climate and anthropogenic influences on coastal ecosystems, as well as improve management of the coastal zone and wetland restoration.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

蓝色碳是指储存在海草草地和沼泽等沿海系统中的碳。这些海洋植物通过制造，存储和释放碳在碳循环中起着重要作用。这些植物将碳释放为溶解的有机物中的碳。溶解的有机物是由具有复杂结构的非常大的含碳分子制成的。当植物物质（如叶子）分解时，它会形成。这些溶解的分子是全球碳循环的一部分，但是我们对溶解的有机物的不同类型或随时间变化的方式了解不多。这项研究将研究帕迪拉湾的盐沼和鳗鱼草床如何创造，改变和存储溶解的有机物。帕迪拉湾（Padilla Bay）是华盛顿州沿海水域的一个大海湾。将测量如何从盐沼中流出的溶解有机物的数量和类型以及从涨潮到低潮以及不同季节的海湾变化。这项研究将帮助科学家了解蓝色碳系统在碳循环中在沿海水域中的作用和重要性。拟议的活动结合了一种系统和过程方法，用于评估盐沼泽，泥浆和鳗草床中的DOM源和循环。将研究地表水，沉积物孔隙水和植物渗滤液，以使用光谱，稳定同位素（C-13），溶解有机碳，水质和水动力测量的结合来评估其对DOM循环的贡献。主要目标是检查从盐沼中导出到帕迪拉湾河口的成分，光化学和生物转化的量。 次要目标是评估河口中的鳗草床和泥质的修饰碳流量。帕迪拉湾（Padilla Bay）有几个用于修复的盐沼，还将在这些系统中研究DOM，为将来的不同阶段的碳流量变化提供了基线。这项研究将帮助研究人员更好地预测气候和人为影响对沿海生态系统的影响，并改善对沿海地区和湿地恢复的管理。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估来通过评估来获得支持的。