Input and Metabolism of Ancient Terrestrial Organic C in a Large River: Importance to the Food Web and Net Ecosystem Metabolism

大河流中古代陆地有机碳的输入和代谢：对食物网和净生态系统代谢的重要性

• 批准号: 9973925
• 负责人: Nina Caraco
• 金额: $ 5万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-10-01 至 2001-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9973925&HistoricalAwards=false
• 关键词: Input; Metabolism; Ancient; Terrestrial; Organic

AbstractNina Caraco- 9973925Preliminary 14C measurements, coupled with ecosystem budgets, suggest that much of the organic C that enters the Hudson River was produced on land thousands of years ago and that this material is metabolized during only a few months of riverine residence. Thus, organic compounds that resisted decomposition for hundreds to thousands of years on land, may be fueling present-day metabolism upon entering the river. If true and general, this phenomenon has implications for both riverine food webs, and for carbon storage and metabolism at the global scale. The Investigators propose to use 14C analyses to: 1) confirm these preliminary findings for the Hudson River; 2) infer the source of this ancient C by sampling some major Hudson tributaries which drain watersheds with different land uses; 3) expand their observations to several other rivers; and 4) examine key organisms in the Hudson to see if ancient C supports their growth.

尼娜·卡拉科-9973925初步的14 C测量，加上生态系统的收支，表明进入哈德逊河的大部分有机C是几千年前在陆地上产生的，而且这种物质在河流中只停留了几个月就被代谢掉了。 因此，在陆地上抵抗数百至数千年分解的有机化合物可能在进入河流后促进了当今的新陈代谢。 如果这一现象是真实和普遍的，那么它对河流食物网以及全球范围内的碳储存和代谢都有影响。研究人员建议使用14 C分析来：1）确认哈德逊河的这些初步发现; 2）通过对一些主要的哈德逊支流进行采样来推断这种古老的C的来源，这些支流排放具有不同土地用途的流域; 3）将他们的观察扩展到其他几条河流; 4）检查哈德逊中的关键生物，看看古老的C是否支持它们的生长。