Collaborative Research: Delivery and Fate of Old Terrestrial Organic Carbon in a Riverine Ecosystem

合作研究：河流生态系统中古老陆地有机碳的传递和归宿

• 批准号: 0234533
• 负责人: James Bauer
• 金额: $ 32.27万
• 依托单位: College of William & Mary Virginia Institute of Marine Science
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0234533&HistoricalAwards=false
• 关键词: Collaborative; Research; Delivery; Fate; Old

This interdisciplinary study, combining organic isotope geochemistry and freshwater ecosystem science, seeks to determine the importance and role of Aged Terrestrial Organic C (ATOC, which is naturally depleted in 14C) after it is exported from landscapes to large rivers. The investigators will to determine what happens to old terrestrial organic matter once it enters a river. The Hudson River is the focus of this study because prior work has shown terrestrial organic matter of considerable age (1000 to 5000 years old) dominates C inputs to this river. Observations, experiments and modeling will be used to determine (1) the variability in ATOC delivery to large rivers across seasons and among tributaries, (2) decomposition rates of ATOC within rivers, (3) controls on the balance between ATOC decomposition and export, and (4) the importance of ATOC in fueling riverine metabolism, relative to younger terrestrial inputs and to primary production within rivers themselves. Graduate and undergraduate students working on this project will receive multi-disciplinary training that will strengthen research and education linkages among three collaborating institutions. The investigators will continue to develop interactions with Hudson River outreach organizations (Clearwater, Scenic Hudson) to communicate project results to the general public. The idea that a modern river is influenced by organic matter produced in forests centuries ago is a captivating framework with which to educate the public about the C cycle in general and rivers in particular, and the inextricable link between continents and the ocean.

这项跨学科研究结合了有机同位素地球化学和淡水生态系统科学，旨在确定老化陆地有机碳（ATOC，在 14C 下自然耗尽）在从景观输出到大河流后的重要性和作用。 研究人员将确定古老的陆地有机物进入河流后会发生什么。 哈德逊河是这项研究的重点，因为之前的研究表明，相当古老（1000至5000年）的陆地有机物在这条河的碳输入中占主导地位。 将使用观测、实验和建模来确定（1）跨季节和支流之间向大河流输送 ATOC 的变异性，（2）河流内 ATOC 的分解率，（3）对 ATOC 分解和输出之间平衡的控制，以及（4）相对于较年轻的陆地输入和河流本身的初级生产，ATOC 在促进河流新陈代谢方面的重要性。 从事该项目的研究生和本科生将接受多学科培训，这将加强三个合作机构之间的研究和教育联系。调查人员将继续与哈德逊河外展组织（Clearwater、Scenic Hudson）开展互动，向公众传达项目结果。现代河流受到几个世纪前森林中产生的有机物影响的想法是一个迷人的框架，可以用来教育公众一般的碳循环，特别是河流，以及大陆与海洋之间密不可分的联系。