Results are presented about the changes in chlorophyll a density, carbon fixation and nutrient levels in the surface waters of three transects of the southern South China Sea (SCS), northern Java Sea (JS) and eastern Indian Ocean (IO) during April 5~16 of 2011. The in situ Chl a concentration and carbon fixation showed decreasing trends from high to low latitude along the three transects, while the photosynthetic rate of phytoplankton estimated from 14C incorporation displayed no simple variation with latitude. Chl a concentration and carbon fixation in the IO water was lower than that in the JS water. Higher salinity and lower contents of dissolved inorganic nitrogen (DIN) and silicate (SiO32-) characterized the IO water as compared to the SCS or JS water, and the PO43- content was lower in the IO water than in the SCS or JS water in most cases. Our results also indicate the importance of DIN and SiO32- concentrations for the geographical changes in phytoplankton biomass and primary productivity among the three regions.
YI Rong
,
KE Zhi-xin
,
SONG Xing-yu
,
SHEN Ping-ping
,
WANG Sheng-fu
,
FAN Yan-zhi
,
HUANG Liang-min
,
TAN Ye-hui
,
LI Gang
. Comparisons of surface Chl a and primary productivity along three transects of the southern South China Sea, northern Java Sea and eastern Indian Ocean in April 2011*[J]. 热带海洋学报, 2014
, 33(6)
: 61
-67
.
DOI: 10.11978/j.issn.1009-5470.2014.06.008
Results are presented about the changes in chlorophyll a density, carbon fixation and nutrient levels in the surface waters of three transects of the southern South China Sea (SCS), northern Java Sea (JS) and eastern Indian Ocean (IO) during April 5~16 of 2011. The in situ Chl a concentration and carbon fixation showed decreasing trends from high to low latitude along the three transects, while the photosynthetic rate of phytoplankton estimated from 14C incorporation displayed no simple variation with latitude. Chl a concentration and carbon fixation in the IO water was lower than that in the JS water. Higher salinity and lower contents of dissolved inorganic nitrogen (DIN) and silicate (SiO32-) characterized the IO water as compared to the SCS or JS water, and the PO43- content was lower in the IO water than in the SCS or JS water in most cases. Our results also indicate the importance of DIN and SiO32- concentrations for the geographical changes in phytoplankton biomass and primary productivity among the three regions.
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