期刊
BIOGEOSCIENCES
卷 10, 期 4, 页码 2775-2785出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-10-2775-2013
关键词
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资金
- National Basic Research Program (973 Program) of China [2009CB421203]
- National Science Foundation of China [41106119, NSFC 40925018, 41176112]
- Fundamental Research Funds for the Central Universities of Xiamen University [2011121007, 2012121058]
- Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration [LMEB201102]
- Hong Kong University Grants Committee through the Area of Excellence program [AoE/P-04/04]
- Hong Kong Research Grant Council [661610, 661911]
We conducted a comprehensive investigation on the microzooplankton herbivory effect on phytoplankton in the northern South China Sea (SCS) using the seawater dilution technique at surface and deep chlorophyll maximum (DCM) layers on two cruises (July-August of 2009 and January of 2010). We compared vertical (surface vs. DCM), spatial (onshore vs. offshore), and seasonal (summer vs. winter) differences of phytoplankton growth (mu(0)) and microzooplankton grazing rates (m). During summer, both mu(0) and m were significantly higher at the surface than at the DCM layer, which was below the mixed layer. During winter, surface mu(0) was significantly higher than at the DCM, while m was not significantly different between the two layers, both of which were within the mixed layer. Surface mu(0) was, on average, significantly higher in summer than in winter, while average surface m was not different between the two seasons. There were no cross-shelf gradients of mu(0) in summer or winter surface waters. In surface waters, mu(0) was not correlated with ambient nitrate concentrations, and the effect of nutrient enrichment on phytoplankton growth was not pronounced. There was a decreasing trend of m from shelf to basin surface waters in summer, but not in winter. Microzooplankton grazing effect on phytoplankton (m/mu(0)) was relatively small in the summer basin waters, indicating a decoupling of microzooplankton grazing and phytoplankton growth at this time. On average, microzooplankton grazed 73% and 65% of the daily primary production in summer and winter, respectively.
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