Biogeochemical Cycling in the Organic-Rich Coastal Environment

摘要-0002358 PIS概述了一种三管齐下的方法，以记录北卡罗来纳州望角湾的有机物的输入和最终命运。在第一步中，PIs将使用平板圈闭和地表沉积物收集悬浮物，以量化现代放射性碳浓缩有机质的来源，评估交付是否随季节变化，并确定来自每个来源的现代碳在硫酸盐还原和甲烷产生区的降解中幸存下来并被埋藏的百分比。该项目的第二个目标需要了解控制孔隙水中DOC的化学成分和分子尺寸分布的因素，以及进行脉冲示踪实验，以直接观察碳流入和流过这个DOC池的情况。最后，PI将重点研究硫酸盐还原细菌和产甲烷细菌的发酵和末端代谢，以确定消耗低分子量DOC的过程。

ABSTRACTOCE-0002358 A three pronged approach is outlined by the PIs to document the input and ultimate fate of organic matter in Cape Lookout Bight, North Carolina. In step one, the PIs will collect suspended matter using plate traps and surficial sediments to quantify the sources of modern, bomb radiocarbon-enriched organic matter, assess whether delivery varies seasonally and determine what percentage of the modern carbon from each source survives degradation in sulfate reducing and methane producing zones and is buried. The second goal of this project entails understanding the factors that control the chemical composition and molecular size distribution in porewater DOC, as well as conduct a pulse-tracer experiment to directly observe the flow of carbon into and through this DOC pool. Lastly, the PIs will focus on fermentation and terminal metabolism by sulfate reducing and methanogenic bacteria to ascertain the processes that consume low molecular weight DOC.