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IJMS Vol.38(2) [June 2009] >

Title: Changes in major carbon components during a fertilization experiment with surface water from the Central Indian Ocean
Authors: S, Tang
Y, Zhou H
T, Peng X
L, Jiang
J, Wu Z
C, Lin R
Keywords: fertilization experiment
carbon record
plankton activities
Indian Ocean
Issue Date: Jun-2009
Publisher: CSIR
Abstract: Shipboard iron- and macronutrient-addition experiment was conducted in the Central Indian Ocean, to investigate the variations of carbon in different forms and its records for plankton activities. Experiments were conducted in four 500-L acrylic barrels with the surface seawater near 24ºS, 70ºE. The concentration of chlorophyll a, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and particulate organic carbon (POC) were measured. DOC concentration had a dramatic increase when phytoplankton bloom, which is caused by the excretion of blooming phytoplankton. Another maximum of DOC concentration occurred after phytoplankton bloom corresponds to the bacterial degradation of organic matters or the excretion of phytoplankton. The decrease of DOC concentration following the two maxima might result from the absorption of DOC by bacteria. The increasing trends of POC before phytoplankton bloom were consistent with that of DOC and chlorophyll a, indicating that phytoplankton growth dominated the plankton activities. The variation of POC concentration just after bloom was controlled by the decomposition of phytoplankton and the growth of bacteria. However, POC concentration increased at the end of the experiment, which might be caused by the growth of bacteria with the utilization of DOC. The present study infers that the carbon records, particularly POC and DOC, in the seawater are indicative to plankton activities.
Page(s): 135-141
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.38(2) [June 2009]

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