Ammonium uptake and regeneration fluxes of the microplankton communities in Jiaozhou Bay
The results from four cruises (Nov. 1991–Jul. 1992) to examine fluxes of ammonium uptake and regeneration in the surface layer of Jiaozhou Bay are presented. Seasonal variations of the two fluxes were in the order, summer>spring>autumn>winter. Diel patterns were characterized by higher uptake in the daytime and higher regeneration at night. Averaged uptake and regeneration fluxes on an annual scale were 0.073 and 0.053 μmol·L−1·h−1 respectively. Regeneration fluxes were always less than uptake fluxes throughout the year. The longest turnover time was 16.34 d (in winter), and the shortest one was 0.68 d (in summer). The major uptake flux was contributed by the smallest fraction-picoplankton. The extents of light-dependence of ammouium uptake by different size fractions were in the order: netplankton>nanoplankton>picoplankton.
Key wordsammonium uptake and regeneration microplankton Jiaozhou Bay
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