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Titolo:
Dynamics of biodegradable DOC produced by freshwater plankton communities
Autore:
Sondergaard, M; Borch, NH; Riemann, B;
Indirizzi:
Univ Copenhagen, Freshwater Biol Lab, DK-3400 Hillerod, Denmark Univ Copenhagen Hillerod Denmark DK-3400 Lab, DK-3400 Hillerod, Denmark Natl Environm Res Lab, Dept Marine Ecol, DK-4000 Roskilde, Denmark Natl Environm Res Lab Roskilde Denmark DK-4000 DK-4000 Roskilde, Denmark
Titolo Testata:
AQUATIC MICROBIAL ECOLOGY
fascicolo: 1, volume: 23, anno: 2000,
pagine: 73 - 83
SICI:
0948-3055(200012)23:1<73:DOBDPB>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISSOLVED ORGANIC-CARBON; BACTERIAL-GROWTH; SARGASSO-SEA; AMINO-ACIDS; MATTER; BACTERIOPLANKTON; PHYTOPLANKTON; SEAWATER; BLOOM; DECOMPOSITION;
Keywords:
biodegradable DOC; phytoplankton blooms; lakes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Sondergaard, M Univ Copenhagen, Freshwater Biol Lab, Helsingorsgade 51, DK-3400 Hillerod,Denmark Univ Copenhagen Helsingorsgade 51 Hillerod Denmark DK-3400
Citazione:
M. Sondergaard et al., "Dynamics of biodegradable DOC produced by freshwater plankton communities", AQUAT MIC E, 23(1), 2000, pp. 73-83

Abstract

The net production of dissolved organic carbon (DOC) and DOC biodegradability were followed during experimental diatom blooms in freshwater enclosures. DOC accumulated at almost constant rates of 4.4 muM d(-1) during the increase and the decay of the blooms. A high production of 188 PM occurred in an episodic event over 5 d in 1 of 4 enclosures. Two independent methods tomeasure biodegradable DOC (BDOC) showed perfect agreement and inorganic nutrients neither affected the degradation rates nor the amount of DOC degraded. The accumulating DOC was initially recalcitrant (RDOC) and about 25 muMRDOC was produced during the increase in phytoplankton biomass. When the plankton communities declined, the BDOC increased, concomitant with the continued DOC accumulation: about 60 to 82 % of the new DOC was biodegradable when the experiment was terminated after 19 d. It is suggested that a changein the quality of produced DOC took place over the course of the bloom. The turnover time of the BDOC pool was measured in batch cultures and ranged from 75 to 120 d. The biodegradable pool was totally dominated by semi-labile components. The high chemical resistance to degradation controls the long turnover times and the accumulation of DOC.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/01/21 alle ore 22:58:13