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: 9633456
• 负责人: Christopher Martens
• 金额: $ 52.5万
• 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: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633456&HistoricalAwards=false
• 关键词: Biogeochemical; Cycling; Organic; Rich; Coastal

9633456 Martens The burial and preservation of organic matter on the continental margins of the world ocean is a process of global importance. In fact, burial out of direct contact with the atmosphere is responsible not only for the deposits of fossil organic matter found throughout the world but also for the persistence of molecular oxygen in the Earth's atmosphere. Understanding the factors impacting the decomposition, preservation, and burial of perimarine organic matter has understandably been one of the classical problems of low-temperature geochemistry. In this project, a group of biogeochemists will be continuing their work on this problem of environmental and economic importance. In this next phase of their research, the focus will be on the relationship of organic matter decomposition and preservation to organic sorption onto sedimentary grains with large surface areas per unit mass (essentially the very finest components of sediments, such as clay minerals). They will carry out laboratory experiments to complement studies of organic sedimentation, decomposition, and burial and four contrasting inner-shelf field sites characterized by different types and rates of organic input as well as different microbiological and sedimentological characteristics. The researchers expect that this approach will lead to an improved quantitative understanding of the relationship of organic preservation to such variables as organic deposit rate, differences in microbial decomposition processes, adsorption and desorption of dissolved organic matter on mineral grains, and burial rate.

小行星9633456 世界海洋大陆边有机物的埋藏和保存是一个具有全球重要性的过程。 事实上，与大气层直接接触的埋藏不仅是世界各地发现的化石有机物质沉积的原因，也是地球大气层中分子氧持续存在的原因。了解影响围海有机质分解、保存和埋藏的因素是低温地球化学的经典问题之一。 在这个项目中，一组地球化学家将继续研究这个具有环境和经济重要性的问题。 在下一阶段的研究中，重点将是有机物分解和保存与每单位质量大表面积沉积颗粒（基本上是沉积物中最细的成分，如粘土矿物）的有机吸附之间的关系。他们将进行实验室实验，以补充对有机物沉积、分解和掩埋以及四个对比鲜明的内陆架实地的研究，这些实地的特点是有机物投入的类型和速度不同，微生物和沉积学特征也不同。研究人员预计，这种方法将导致更好的定量了解有机保存等变量的关系，如有机存款率，微生物分解过程的差异，溶解有机物对矿物颗粒的吸附和解吸，埋藏率。