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Sondergaard, M., Freshwater Biol. Lab., Univ. Copenhagen, Helsingorsgade 51, DK-3400 Hillerod, Denmark, flabms@inet.uni2.dk
Borch, N.H., Freshwater Biol. Lab., Univ. Copenhagen, Denmark

ACCUMULATION OF NEW SEMILABILE DOC DURING A STIMULATED FRESHWATER PHYTOPLANKTON BLOOM

Dissolved organic carbon (DOC) accumulated at a rate of approximately 4.5 uM C/day during a stimulated phytoplankton bloom and decay experiment in four freshwater mesocosms. This accumulation occured almost continously during the experiment and was not related to either the dynamics of POC nor the concentration and activity of free-living bacteria. The fraction of carbohydrates to total DOC increased during the experiment while proteinaceous matter decreased.
Subsequent decomposition experiments under nutrient replete conditions showed that degradation of this newly formed DOC was not limited by the availability of nutrients. Two different degradability assays; traditional batch incubations and a bioreactor, gave identical results. Of a total accumulation of 65 uM C, 80% was degraded within 90 days confirming other studies on the turnover rate of semilabile DOC.

SS16 CS18
POSTER
BORCH, N.H.

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