Abstract
Chlorophyll a and primary production were studied in northern South China Sea during summer from 2007 to 2008. Microplankton dominated total phytoplankton biomass in the coast, while picoplankton dominated in the offshore. Algae bloom caused by Thalassionema nitzschioides was found at the subsurface of upwelling regions (D2, C2) in 2008, and maximum of phytoplankton abundance reached 1.58 × 10 6 ind L −1. Integrated primary production ranged from 189.3 to 976.2 mg m −2 d −1 in 2007, and ranged from 652.1 to 6601 mg m −2 d −1 in 2008. PP showed positive relationship with IPP ( p < 0.01) and negative relationship with SST ( p < 0.05). Coastal upwelling and Pearl River discharge sustained high PP, and played important role in regulating the phytoplankton biomass and production.
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