Collaborative Research: Coupled Carbon and Phosphorus Cycling

合作研究：耦合碳磷循环

• 批准号: 0452800
• 负责人: Stephen Monismith
• 金额: $ 36.81万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-01 至 2009-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452800&HistoricalAwards=false
• 关键词: Collaborative; Research; Coupled; Carbon; Phosphorus

ABSTRACTOCE-0453117Although the relationship between carbon and nutrient fluxes, and the resulting elemental ratio of dominant biomass has been reasonably well-studied for planktonic systems, little is known about the extent to which carbon and different nutrient cycles are coupled in benthic ecosystems. Coral reefs are excellent examples of benthic-dominated ecosystems in which coupling of carbon and nutrient cycles, in particular phosphorus, could be very strong or very weak. Thus, the fundamental question arises of whether the kinetics of net carbon production and phosphorus assimilation by reef communities are independently forced, resulting in widely varying C:P on reefs, or whether net carbon production simply follows rates of phosphorus assimilation through the C:P ratio of the dominant biomass in a classic model of nutrient limitation. This project combines the expertise of two coral reef biogechemists from the University of Hawaii, with that of a hydrodynamicist from Stanford University, in an interdisciplinary approach to resolve this issue. Over a year-long period, carbon and phosphorus fluxes will be measured from changes in the chemical composition of seawater moving through a control volume on a reef flat on the Kaneohe Bay Barrier Reef, Hawaii. The secondary objective is to better understand the fundamental role of wave-driven currents and Stokes drift in the net transport of water across coral reefs. These results would extend knowledge gained from prior work using flumes, with their defined flow characteristics, to the field where there has only been limited data taken prior to the advent of modern instrumentation capable of resolving water flows across the control volume boundaries. The broader Impacts of this project include improving understanding of how the productivity and composition of benthic reef communities vary under different conditions and will, therefore, provide useful knowledge to agents and agencies responsible for their management as natural resources. The project will also find mutual support with an existing NOAA program for which the University of Hawaii scientists are participants that promotes and develops the exchange of technological expertise between coastal marine scientists throughout the entire Pacific region. Finally, this project will provide valuable field experience to graduate and undergraduate students at the University of Hawaii and Stanford University.

Abstractoce-0453117尽管碳和养分通量之间的关系以及浮游生物系统的主要研究良好，因此对浮游生物系统的元素比的元素比在底栖生态系统中与碳和不同的营养周期相结合的程度知之甚少。珊瑚礁是底栖主导的生态系统的绝佳例子，其中碳和养分周期的耦合，尤其是磷可能非常强或非常弱。因此，基本问题是关于礁社区净碳生产和磷同化的动力学是独立的，导致礁石上的c：p差异很大，还是净碳的产量只是遵循磷在经典模型中占主导地位生物群的C磷的磷速率。该项目结合了夏威夷大学的两名珊瑚礁生物学家的专业知识，以及来自斯坦福大学的流体动力学家的专业知识，采用了解决这个问题的跨学科方法。 在一年的时间内，将通过在夏威夷Kaneohe Bay Barrier Reef的礁石公寓上移动的海水的化学成分的变化来测量碳和磷通量。次要目标是更好地了解波驱动电流的基本作用，而斯托克斯在跨珊瑚礁的水的净运输中漂移。 这些结果将从先前的工作中获得的知识扩展到及其定义的流量特征，到仅在现代仪器出现之前才有有限的数据，能够在整个控制量范围内解决水流。 该项目的更广泛的影响包括提高对底栖礁社区的生产力和组成的理解，在不同条件下如何变化，因此，将为负责其管理为自然资源的代理商和机构提供有用的知识。该项目还将通过现有的NOAA计划找到相互支持，夏威夷大学科学家是参与者，他们促进和发展整个太平洋地区沿海海洋科学家之间的技术专业知识。最后，该项目将为夏威夷大学和斯坦福大学的研究生和本科生提供宝贵的实地经验。