

FOLLOWUS
1. College of Fishery Science Shanghai Fisheries University
2. Beihai Monitoring Center of State Oceanic Administration
3. Institute of Oceanology Chinese Academy of Sciences
4. State Key Laboratory of Estuarine and Coastal Research East China Normal University
5. College of Computer Science Shanghai Fisheries University
6. College of Chemistry and Chemical Engineering Ocean University of China
Published:2005
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Dongfang, Y., Yu, C., Zhenhui, G. et al. Silicon limitation on primary production and its destiny in Jiaozhou Bay, China., Chin. J. Ocean. Limnol. 23, 72–90 (2005). https://doi.org/10.1007/BF02845147
The authors analyzed the data collected in the Ecological Station Jiaozhou Bay from May 1991 to November 1994
including 12 seasonal investigations
to determine the characteristics
dynamic cycles and variation trends of the silicate in the bay. The results indicated that the rivers around Jiaozhou Bay provided abundant supply of silicate to the bay. The silicate concentration there depended on river flow variation. The horizontal variation of silicate concentration on the transect showed that the silicate concentration decreased with distance from shorelines. The vertical variation of it showed that silicate sank and deposited on the sea bottom by phytoplankton uptake and death
and zooplankton excretion. In this way
silicon would endlessly be transferred from terrestrial sources to the sea bottom. The silicon took up by phytoplankton and by other biogeochemical processes led to insufficient silicon supply for phytoplankton growth. In this paper
a 2D dynamic model of river flow versus silicate concentration was established by which silicate concentrations of 0.028–0.062 μmol/L in seawater was yielded by inputting certain seasonal unit river flows (m3/s)
or in other words
the silicate supply rate; and when the unit river flow was set to zero
meaning no river input
the silicate concentrations were between 0.05–0.69 μmol/L in the bay. In terms of the silicate supply rate
Jiaozhou Bay was divided into three parts. The division shows a given river flow could generate several different silicon levels in corresponding regions
so as to the silicon-limitation levels to the phytoplankton in these regions. Another dynamic model of river flow versus primary production was set up by which the phytoplankton primary production of 5.21–15.55 (mgC/m2·d)/(m3/s) were obtained in our case at unit river flow values via silicate concentration or primary production conversion rate. Similarly
the values of primary production of 121.98–195.33 (mgC/m2·d) were achieved at zero unit river flow condition. A primary production conversion rate reflects the sensitivity to silicon depletion so as to different phytoplankton primary production and silicon requirements by different phytoplankton assemblages in different marine areas. In addition
the authors differentiated two equations (Eqs. 1 and 2) in the models to obtain the river flow variation that determines the silicate concentration variation
and in turn
the variation of primary production. These results proved further that nutrient silicon is a limiting factor for phytoplankton growth.
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