Biogeochemical Cycling in the Organic-Rich Coastal Environment

富含有机物的沿海环境中的生物地球化学循环

• 批准号: 9217570
• 负责人: Christopher Martens
• 金额: $ 56.27万
• 依托单位: University of North Carolina at Chapel Hill
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217570&HistoricalAwards=false
• 关键词: Biogeochemical; Cycling; Organic; Rich; Coastal

The project focuses on a question of fundamental importance for understanding the global oceanic carbon cycle: What factors and processes control whether organic matter deposited in marine sediments will be remineralized or buried. Organic matter deposition, remineralization, and burial will be studied at sites along transects in a shallow, highly productive North Carolina coastal lagoon and on the upper continental slope off Cape Hatteras, NC. Specific objectives include: (1) determination of how the fraction of organic carbon deposition that is remineralized varies along these two coastal transects, (2) determination of sources and ages of the reactive fraction, (3) determination of the chemical composition of reactive and unreactive fractions of the organic matter at sites along these transects, and (4) determination of the effect of respiratory mode on organic matter remineralization rates and chemical composition of buried material. Objectives (1), (2), and (3) involve extensive field work while objective (4) involves as well-controlled laboratory microcosm study. Combining field data and laboratory experiments provides a powerful tool for directly testing hypotheses regarding the mechanisms by which environmental parameters influence organic matter reactivity.

该项目的重点是一个具有根本重要性的问题， 了解全球海洋碳循环：哪些因素和 海洋沉积过程控制着海洋中的有机物 沉积物将被矿化或掩埋。 有机质 沉积、矿化和埋藏将在现场进行研究 北卡罗来纳州的一个浅的、高产的样带的沿着 沿海泻湖和大陆坡上的好望角 Hatteras，NC. 具体目标包括：（1）确定 有机碳沉积物中被分解的部分 沿着这两个沿海样带的变化，（2）确定 活性组分的来源和年龄; 反应性和非反应性馏分的化学组成 有机质在沿着这些样带，和（4） 呼吸方式对有机物影响的测定 埋藏物质的矿化速率和化学成分。 目标（1）、（2）和（3）涉及广泛的实地工作， 目标（4）涉及控制良好的实验室微观世界 study. 结合现场数据和实验室实验， 一个强大的工具，用于直接测试关于 环境参数影响有机质的机制 物质反应性。