The Origins and Biological Utilization of Dissolved Organic Carbon in Riverine Saltmarsh Estuaries

河流盐沼河口溶解有机碳的来源和生物利用

• 批准号: 9209151
• 负责人: Bruce Peterson
• 金额: $ 17.5万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1994-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9209151&HistoricalAwards=false
• 关键词: Origins; Biological; Utilization; Dissolved; Organic

The cycle of dissolved organic matter in riverine saltmarsh estuaries is remarkably non-conservative. In the Parker River - Plum Island Sound estuary of northern Massachusetts there are major inputs of DOC from rivers and from the sea, but there are also large inputs from fresh and saline tidal marshes and from estuarine phytoplankton. Through the use of stable isotope tracers we can follow the production and consumption of DOC from these different sources. The emerging view is that the large background of terrestrial and oceanic DOC is relatively refractory while fresh DOC from algae and marshes is largely responsible for the high rates of bacterial activity in these systems. The algae and marshes at times produce large quantities of DOC that are not immediately consumed by bacteria and are thus available for transport with the tides. In this proposal, the investigators couple the stable isotope approach with ecosystem modeling to calculate the ecosystem level fluxes of DOC from these different sources and to estimate the microbial consumption and export of dissolved organic matter from each source.

河流盐沼溶解有机质的循环 河口是非常不保守的。 在帕克河里- 北方马萨诸塞州的普拉姆岛湾河口有 DOC的主要输入来自河流和海洋，但 也有大量来自新鲜和含盐的潮汐沼泽的输入， 河口浮游植物 通过使用稳定同位素 示踪剂，我们可以跟踪DOC的生产和消费， 这些不同的来源。 新出现的观点是， 陆地和海洋DOC的背景相对较难 而来自藻类和沼泽的新鲜DOC主要负责 这些系统中细菌活动的高速率。 藻类 沼泽地有时会产生大量的DOC， 立即被细菌消耗，因此可用于 潮汐运输 在这份报告中，调查人员 将稳定同位素方法与生态系统建模相结合， 计算了不同生态系统水平DOC通量 来源和估计微生物的消费和出口 溶解有机物从每个来源。