Nitrogen Fixation and the Production of Dissolved Organic Nitrogen in the North Pacific Ocean

摘要溶解有机氮（DON）是海洋表层最大的固定氮储存库，但其与海洋浮游植物固氮和氮养分需要量的关系尚不清楚。在这项探索性研究小额资助中，伍兹霍尔海洋研究所的研究人员将利用前往北太平洋中央环流的游轮，研究气候变化、水柱物理、专性重氮营养体生物群落动态和溶解有机氮产生之间的关系。研究小组将进行观察研究和船上孵化实验，以确定由Trichodesmium和其他重氮营养体活动产生的固定氮如何在海洋表面循环，以及它与DON池的关系。

ABSTRACTOCE-0224498Although dissolved organic nitrogen (DON) is the largest reservoir of fixed nitrogen in the surface ocean, little is know about its relationship to nitrogen fixation and the nitrogen nutrient requirements of the oceanic phytoplankton. In this Small Grant for Exploratory Research, investigators at the Woods Hole Oceanographic Institution will take advantage of a cruise to the centtral gyre of the North Pacific Ocean to study the relationship between climate variation, water column physics, the biological community dynamics of obligate diazotrophs, and the production of dissolved organic nitrogen. The research team will conduct observational studies as well as shipboard incubation experiments to determine how the fixed nitrogen generated by the activities of Trichodesmium and other diazotrophs are cycled in the surface ocean and how it relates to the pool of DON.