, and E. Breitbarth ( 2005 ), Importance of the diazotrophs as a source of new nitrogen in the ocean , J. Sea Res. , 53 ( 1–2 ), 67 – 91 , doi: 10.1016/j.seares.2004.05.005 .La Roche, J. and Breitbarth, E.: Importance of the diazotrophs as a source of new nitrogen in...
Nitrogen (N2) fixation in oligotrophic surface waters is the main source of new nitrogen to the ocean1and has a key role in fuelling the biological carbon pump2. Oceanic N2fixation has been attributed almost exclusively to cyanobacteria, even though genes encoding nitrogenase, the enzyme that fix...
Tyrrell developed a simple two-box model of oceanic nitrogen and phosphorus cycles to describe the regulation of both nitrate and phosphate concentrations in the global ocean. His criterion for nitrate deficit in the ocean, a molar ratio of N:P in surface waters (R) of less than 16, is ...
Although the Arctic Ocean is the most riverine-influenced of all of the world’s oceans, the importance of terrigenous nutrients in this environment is poorly understood. This study couples estimates of circumpolar riverine nutrient fluxes from the PARTNERS (Pan-Arctic River Transport of Nutrients, O...
The North Atlantic Ocean and its contributing watersheds constitute a region which has seen perhaps the greatest increase in anthropogenically-derived nitrogen. In May of 1994, the International Scope Nitrogen Project, with funding from the Andrew Mellon Foundation, the United Nations Environment Program...
The widespread occurrence of nitrogen limitation to net primary production in terrestrial and marine ecosystems is something of a puzzle; it would seem tha
当当中华商务进口图书旗舰店在线销售正版《海外直订Nitrogen Cycling in the North Atlantic Ocean and Its Watersheds: Report of the International ...》。最新《海外直订Nitrogen Cycling in the North Atlantic Ocean and Its Watersheds: Report of the International
Fig. 1. The continued filtration effects of cascade aquatic ecosystems on nitrogen (N) removal from headwater to estuary. There is still much to investigate and integrate in quantifying N removal in different zones of the land-ocean aquatic continuum for a more accurate assessment of N elimination...
Stable isotopes of sedimentary nitrogen and organic carbon are widely used as proxy variables for biogeochemical parameters and processes in the water colu... T Freudenthal,T Wagner,Frank Wenzhfer,... - 《Geochimica Et Cosmochimica Acta》 被引量: 463发表: 2001年 The effect of redox conditions ...
The oxidation of ammonia to nitrate, nitrification, is a key process in the nitrogen cycle. Ammonia-oxidizing archaea are present in large numbers in the ocean(1-3) and soils(4-6), suggesting a potential role for archaea, in addition to bacteria, in the global nitrogen cycle(7,8). Howev...