Sedimentary Microbiological Communities Across the Equatorial Pacific Carbon-Flux Gradient: Biomass, Composition, Carbon-Utilization Rates, and Production

赤道太平洋沉积微生物群落碳通量梯度：生物量、组成、碳利用率和产量

• 批准号: 9022408
• 负责人: Fred Dobbs
• 金额: $ 14.14万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-15 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9022408&HistoricalAwards=false
• 关键词: Sedimentary; Microbiological; Communities; Across; Equatorial

The central equatorial Pacific (EQPAC) is a very large region of overall high primary productivity that exhibits distinct latitudinal gradients in the flux of organic material from surface waters to the seafloor. A problem in modeling global carbon budgets is that the rate of organic-carbon mineralization at the seafloor in this region is not directly related to surface productivity. Therefore, a better understanding is needed of the processes controlling the destruction of organic matter falling from surface waters. In this regard, it is critical to study the role of sedimentary microorganisms, especially bacteria. This project will sample the microbiological communities on a USJGOFS EQPAC cruise in 1992. The study will employ a multifaceted approach will be used in order to address four hypotheses concerned with the effects of changes in carbon flux to the benthic environment on: 1) sedimentary microbial biomass; 2) the functional-group composition of the microbial community; 3) bacterial utilization of carbon (glutamic acid); 4) the growth rate and productivity of the microbial community. An ultimate goal of this project is to combine these microbiological data with those generated by other EQPAC researchers and to determine the role of bacteria in the mineralization and formation of organic matter in these oceanic sediments.

赤道太平洋中部（EQPAC）是一个非常大的区域， 总体初级生产力高， 有机物质通量的纬度梯度， 从表面沃茨到海底 全球建模中的一个问题 碳收支是有机碳矿化的速率 在该区域的海底， 生产力 因此，需要更好地了解 控制有机物下落破坏的过程 从表面沃茨中。 在这方面，研究 沉积微生物的作用，尤其是细菌。 本项目将在一个 1992年美国联合政府渔业局EQPAC巡航。该研究将采用 将采用多方面的方法，以解决四个 关于碳通量变化影响的假说 对底栖环境的影响：1）沉积微生物生物量; 2)微生物群落的功能群组成; 3)细菌对碳（谷氨酸）的利用; 4）生长 微生物群落的速率和生产力。 一个终极 本项目的目标是将这些微生物学数据联合收割机 与其他EQPAC研究人员产生的结果进行比较， 细菌在矿化和形成 这些海洋沉积物中的有机物。