Collaborative Research: Carbonate Dissolution in Shallow Water Tropical Sediments: The Role of Seagrasses

合作研究：浅水热带沉积物中的碳酸盐溶解：海草的作用

• 批准号: 0136037
• 负责人: David Burdige
• 金额: $ 26.05万
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-02-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0136037&HistoricalAwards=false
• 关键词: Collaborative; Research; Carbonate; Dissolution; Shallow

ABSTRACTOCE-0136037Recently, it has been suggested that oxygen transport into sediments via the roots and rhizomes of seagrasses might resolve the observed discrepancy between the amount of carbonate dissolved and the amount of acid produced from remineralization of sediment organic matter. Combining field observations, laboratory experiments and modeling analysis, a PI from Old Dominion University will team up with a PI from San Jose State University to quantify the influence of seagrass productivity on carbon flux and carbonate dissolution in shallow waters of Lee Stocking Island, Bahamas, a tropical system. The PIs will compare the sediment and porewater composition recovered from a variety of sample types (bare ooid sands to densely vegetates regions with 70% seagrass cover) to establish the relationship between carbonate dissolution in sediments and seagrass density. Other studies to be carried out include incubation experiments of individual seagrass shoots to determine the amount of O2 generated by the roots and rhizomes under variable light and porewater O2 conditions. Additionally, whole sediment core incubation experiments will determine the rate of sediment organic matter degradation and carbonate dissolution. Lastly, Drs. Burdige and Zimmerman plan to compare their data with those obtained via a model of diagenetic processes in carbonate sediments. Results from this study will not only provide basic information on ecological and biogeochemical processes in tropical systems, but will help constrain budgets for carbonate cycling in shallow water carbonate bank environments.

ABSTRACTOCE-0136037最近，有人提出，通过海草的根和根茎将氧气输送到沉积物中可能会解决所观察到的溶解碳酸盐量与沉积物有机质再矿化产生的酸量之间的差异。 结合现场观察、实验室实验和模型分析，奥道明大学的一名 PI 将与圣何塞州立大学的一名 PI 合作，量化海草生产力对热带系统巴哈马李斯托金岛浅水区碳通量和碳酸盐溶解的影响。 PI 将比较从各种样品类型（裸露的鲕状砂到海草覆盖率达 70% 的茂密植被区域）中回收的沉积物和孔隙水成分，以建立沉积物中碳酸盐溶解与海草密度之间的关系。 即将进行的其他研究包括对单个海草芽进行孵化实验，以确定在不同的光照和孔隙水 O2 条件下根和根茎产生的 O2 量。 此外，整个沉积物核心孵化实验将确定沉积物有机质降解和碳酸盐溶解的速率。 最后，博士。伯迪奇和齐默尔曼计划将他们的数据与通过碳酸盐沉积物成岩过程模型获得的数据进行比较。 这项研究的结果不仅将提供热带系统生态和生物地球化学过程的基本信息，还将有助于限制浅水碳酸盐滩环境中碳酸盐循环的预算。