Dissertation Research: The Effect of Iron on Silicon, Nitrate and Carbon uptake by Phytoplankton-potential Mechanisms for altered Si:N and Si:C ratios in Diatoms

论文研究：铁对浮游植物吸收硅、硝酸盐和碳的影响——改变硅藻中的 Si:N 和 Si:C 比率

• 批准号: 0104931
• 负责人: Mark Brzezinski
• 金额: $ 0.48万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104931&HistoricalAwards=false
• 关键词: Dissertation; Research; Effect; Iron; Silicon

Iron plays an important role in the function and productivity of aquatic ecosystems, either directly, via effects on biogeochemistry and nutrient cycling, or indirectly, via effects on plankton community composition. Dr. Brzezinski and Ms. Franck would like to explore the ways in which iron availability can regulate diatom production and macronutrient cycling in the Polar Frontal Zone in the Pacific Sector of the Southern Ocean and in the highly productive upwelling areas off the coast of California and Peru. All are regions where large diatoms blooms and net CO2 drawdown can occur, but where iron (Fe) and silicon (Si) availability may play a role in regulating the timing and occurrence of these blooms and the magnitude of CO2 uptake. In this work the investigators will quantify the effects of Fe availability on Si and nitrate biogeochemistry, as well as look for mechanisms behind the observed effects, e.g. how Fe availability alters Si and nitrate uptake kinetics, diatom species composition and species-specific Si uptake.

铁在水生生态系统的功能和生产力中发挥着重要作用，无论是直接通过对生物地球化学和营养循环的影响，还是间接通过对浮游生物群落组成的影响。Brzezinski博士和Franck女士想探讨铁供应如何能够调节南大洋太平洋区段极地锋面带以及加利福尼亚州和秘鲁沿海高生产力上升区的硅藻生产和常量营养素循环。所有这些都是可能发生大规模硅藻水华和二氧化碳净减少的地区，但铁(Fe)和硅(Si)的有效性可能在调节这些水华发生的时间和发生以及二氧化碳吸收的大小方面发挥作用。在这项工作中，研究人员将量化铁有效性对硅和硝酸盐生物地球化学的影响，并寻找观察到的影响背后的机制，例如铁有效性如何改变硅和硝酸盐吸收动力学、硅藻种类组成和特定物种的硅吸收。