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The carbon budget of coarse woody debris in a temperate broad-leaved secondary forest in Japan



The carbon budget of coarse woody debris in a temperate broad-leaved secondary forest in Japan



Tellus Series B Chemical and Physical Meteorology 59(2): 211-222



We evaluated the carbon budget of coarse woody debris (CWD) in a temperate broad-leaved secondary forest. On the basis of a field survey conducted in 2003, the mass of CWD was estimated at 9.30 tC ha(-1), with snags amounting to 60% of the total mass. Mean annual CWD input mass was estimated to be 0.61 tC ha(-1) yr(-1) by monitoring tree mortality in the forest from 1999 to 2004. We evaluated the CWD decomposition rate as the CO2 evolution rate from CWD by measuring CO2 emissions from 91 CWD samples (R-CWD) with a closed dynamic chamber and infrared gas analysis system. The relationships between RCWD and temperature in the chamber, water content of the CWD, and other CWD characteristics were determined. By scaling the measured R-CWD to the ecosystem, we estimated that the annual R-CWD in the forest in 2003 was 0.50 tC ha(-1) yr(-1) or 10%-16% of the total heterotrophic respiration. Therefore, 0.11 tC ha(-1) yr(-1) or 7% of the forest net ecosystem production was sequestered by CWD. In a young forest, in which CWD input and decomposition are not balanced, the CWD carbon budget needs to be quantified for accurate evaluation of the forest carbon cycle and NEP.

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Accession: 013065859

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DOI: 10.1111/j.1600-0889.2006.00234.x


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