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Nutrient structure and nutrient limitation for phytoplankton growth in Bohai bay in the early summer |
ZHANG Hai-bo1,3, PEI Shao-feng2,3, ZHU Ya-xuan3, WANG Li-sha1, SHI Xiao-yong1, YE Si-yuan2,3, YUAN Hong-ming3, DING Xi-gui3 |
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China;
3. Key Lab of Coastal Wetland Biogeosciences, China Geological Survey, Qingdao 266071, China |
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Abstract Based on the data of nutrients, chlorophyll a and hydrological environment parameters collected in Bohai Bay during the early summer of 2016, we studied the distributions of nutrients and analyzed their possible limitation on the phytoplankton growth by analyzing both the minimum threshold and N:P:Si atomic ratios of nutrient required by phytoplankton cells. The results showed that concentrations and spatial distributions of nutrients were influenced by terrigenous input, cold water from central of Bohai Sea and phytoplankton uptake. Both dissolved inorganic nitrogen (DIN) and silicate (SiO32--Si) concentrations decreased from nearshore to the offshore bay mouth, and the mean concentration of DIN was (7.67±6.48) μmol/L and SiO32--Si was (5.44±3.01) μmol/L. In the surface of bay mouth, the concentration of DIN was (2.21±2.94) μmol/L in average, and 50% of samples was below the threshold, especially, 58.3% of them showed DIN limitation for phytoplankton growth. Comparatively, concentrations of activated phosphate (PO43--P) were high in the nearshore and the bay mouth due to riverine input, and a zone with low concentration appeared in the middle probably caused by the phytoplankton uptake. The mean concentration of PO43--P was (0.07±0.07) μmol/L in the whole study area. The concentrations of PO43--P in the surface water were below the threshold of 0.03μmol/L at about 74.3% stations in the middle zone of study area, showing an obvious P limitation for phytoplankton cells. With the increasing disparity of riverine input between nitrogen and phosphorus, the P limitation for phytoplankton would be more serious in our study area.
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Received: 06 February 2018
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