Bacterial Production and N Uptake in the Equatorial Pacific

赤道中部太平洋是一个面积很大、初级生产量很高的地区，据推测，这将支持全球新生产量的相当大一部分。新的生产量之所以重要，是因为它与物质从海洋上层到下层的垂直流动有关，而且这种联系在海洋辐射活性气体循环(温室问题)中所起的隐含作用。该项目是美国中赤道太平洋全球海洋通量联合研究(JGOFS)的一部分，旨在回答北汽关于异养细菌在赤道太平洋中的作用的一些问题。异养细菌被认为是赤道太平洋系统的重要组成部分：1.它们是溶解有机氮和碳的主要汇之一；2.它们富含氮，碳氮比约为4.5；3.它们构成了生物量的很大一部分，有时可能大于浮游植物；4.它们在许多海洋系统的氨吸收中占很大比例。该项目将研究异养细菌在赤道太平洋氮循环中的作用，并将具体测量细菌产量、生物量和细菌对氮的吸收。

The central equatorial Pacific is a very large region with high primary production, which is hypothesized to support a substantial faction of global new production. New production is important because of its link to the vertical flux of meterial from the upper to the lower ocean and the implied role of that link in how the ocean cycles radiatively-active gases (the greenhouse problem). This project constitues a part of the US joint global ocean flux study (JGOFS) in the central equatorial pacific and seeks to answer some baic questions about the role of heterotrophic bacteria in the equatorial Pacific. Heterotrophic bacteria are believed to be an important component of the equatorial pacific system as: 1. they are one of the predominant sinks of dissolved organic nitrogen and carbon; 2. they are nitrogen rich with a carbon to nitrogen ratio of about 4.5; 3. they comprise a large portion of the biomass, and may at times be greater than the phytoplankton; and 4. they account for a large fraction of ammonium uptake in a number of marine systems. This project will examine the role of heterotrophic bacteria in nitrogen cycling in the equatorial pacific and will specifically measure bacterial production, biomass, and nitrogen uptake by bacteria.