Journal cover Journal topic
Ocean Science An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/osd-6-2649-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
11 Nov 2009
Review status
This discussion paper is a preprint. It has been under review for the journal Ocean Science (OS). The revised manuscript was not accepted.
Adding nitrate and phosphate separately or together in the Central Indian Ocean: a nutrient enrichment experiment
S. Tang1, L. Jiang1, and Z. J. Wu2 1Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
2State Key Lab of Marine Geology, Tongji University, Shanghai, China
Abstract. Nutrient enrichment experiments were carried out in the Central Indian Ocean during the Chinese First Around-the world Research Cruise, adding nitrate, phosphate, or a mixture of both of them to surface seawater. The concentration of nitrate, nitrite, ammonia, and phosphate were analyzed spectrophotometrically, the chlorophyll-a concentration with fluorescence analysis, and the temperature variation during the experiment recorded. Addition of nitrate resulted in rapid growth of phytoplankton concomitant with depletion of nitrate in the water samples. No apparent variation occurred in chlorophyll-a concentration when phosphate was added. Combining nitrate and phosphate proved to be best to promote phytoplankton bloom, and nitrate was depleted prior to phosphate. After nitrate was consumed, a substantial amount of phytoplankton survived on the supplied phosphate. No correlation was found between the nitrate to phosphate ratio and chlorophyll-a or phytoplankton growth rate. We also found no correlation between water temperature and chlorophyll-a or phytoplankton growth rate. We conclude that neither nitrate to phosphate ratio nor water temperature control the growth of phytoplankton.

Citation: Tang, S., Jiang, L., and Wu, Z. J.: Adding nitrate and phosphate separately or together in the Central Indian Ocean: a nutrient enrichment experiment, Ocean Sci. Discuss., 6, 2649-2666, https://doi.org/10.5194/osd-6-2649-2009, 2009.
S. Tang et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC C842: 'Review', Anonymous Referee #1, 26 Nov 2009 Printer-friendly Version 
AC C875: 'response to the reviewer 1#', song tang, 05 Dec 2009 Printer-friendly Version Supplement 
AC C879: 'supplement', song tang, 05 Dec 2009 Printer-friendly Version Supplement 
 
RC C951: 'Referee comment', Anonymous Referee #2, 04 Jan 2010 Printer-friendly Version 
AC C1013: 'response to the reviewer 2#', song tang, 22 Jan 2010 Printer-friendly Version Supplement 
S. Tang et al.
S. Tang et al.

Viewed

Total article views: 714 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
333 344 37 714 34 39

Views and downloads (calculated since 01 Feb 2013)

Cumulative views and downloads (calculated since 01 Feb 2013)

Saved

Discussed

Latest update: 23 Aug 2017
Publications Copernicus
Download
Share