Water-extractable soil carbon in relation to the belowground carbon cycle |
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Authors: | R. Jandl P. Sollins |
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Affiliation: | (1) Forstliche Bundesversuchsanstalt, A-1130 Vienna, Austria, AT;(2) Department of Forest Science, Oregon State University Corvallis, OR, 97331, USA, US;(3) Seckendorff – Gudent Weg 8, A-1131 Vienna, Austria Fax: (1) 8775907; e-mail: rjandl@mail.boku.ac.at, AT |
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Abstract: | We investigated the role of water-extractable carbon (C-extr) as potential substrate for forest soil microorganisms by comparing belowground C fluxes at a plot with the forest floor removed (no-litter) and at a control plot. One-third lower soil respiration rates at the no-litter plot gave evidence that the forest floor was the source of considerable amounts of microbially degradable C. Laboratory incubation of C-extr, fractionated into neutral and acid moieties, showed that part of the C-extr was degraded rapidly, and that the high-molecular-weight acid fraction was much less degradable than the neutral C. To the extent that the degradable portion of the water-extractable C can be regenerated quickly, it may supply much of the substrate for heterotrophic soil respiration. Received: 11 December 1995 |
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Keywords: | Water-extractable carbon fractions Biodegradation Belowground carbon dynamics Soil respiration Dissolved organic carbon |
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