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Decomposition dynamics of coarse woody debris of three important central European tree species
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Coarse woody debris (CWD) is an important element of forest structure that needs to be considered when managing forests for biodiversity,carbon storage or bioenergy. To manage it effectively,dynamics of CWD decomposition should be known.
Using a chronosequence approach,we assessed the decomposition rates of downed CWD of Fagus sylvatica,Picea abies and Pinus sylvestris,which was sampled from three different years of tree fall and three different initial diameter classes (> 10 - ≤ 20 cm,> 20 - ≤40 cm,> 40 cm). Samples originating from wind throws in 1999 were collected along a temperature and precipitation gradient. Based on the decay class and associated wood densities,log volumes were converted into CWD mass and C content. Log fragmentation was assessed over one year for log segments of intermediate diameters (> 20 - 40 cm) after 8 and 18 years of decomposition.
Significantly higher decomposition constants (k) were found in logs of F. sylvatica (0.054 year-1) than in P. abies (0.033 year-1) and P. sylvestris (0.032 year-1). However,mass loss of P. sylvestris occurred mainly in sapwood and hence k for the whole wood may be overestimated. Decomposition rates generally decreased with increasing log diameter class except for smaller dimensions in P. abies. About 74 % of the variation in mass remaining could be explained by decomposition time (27 %),tree species (11 %),diameter (17 %),the interactive effects between tree species and diameter (4 %) as well as between decomposition time and tree species (3 %) and a random factor (site and tree; 9.5 %),whereas temperature explained only 2 %.
Wood fragmentation may play a more important role than previously thought. Here,between 14 % and 30 % of the decomposition rates (for the first 18 years) were attributable to this process. Carbon (C) density (mgC · ccm-3),which was initially highest for F. sylvatica,followed by P. sylvestris and P. abies,decreased with increasing decay stage to similar values for all species.
The apparent lack of climate effects on decomposition of logs in the field indicates that regional decomposition models for CWD may be developed on the basis of information on decomposition time,tree species and dimension only. These can then be used to predict C dynamics in CWD as input for C accounting models and for habitat management.
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Decomposition dynamics of coarse woody debris of three important central European tree species
),
Abstract
Coarse woody debris (CWD) is an important element of forest structure that needs to be considered when managing forests for biodiversity,carbon storage or bioenergy. To manage it effectively,dynamics of CWD decomposition should be known.
Using a chronosequence approach,we assessed the decomposition rates of downed CWD of Fagus sylvatica,Picea abies and Pinus sylvestris,which was sampled from three different years of tree fall and three different initial diameter classes (> 10 - ≤ 20 cm,> 20 - ≤40 cm,> 40 cm). Samples originating from wind throws in 1999 were collected along a temperature and precipitation gradient. Based on the decay class and associated wood densities,log volumes were converted into CWD mass and C content. Log fragmentation was assessed over one year for log segments of intermediate diameters (> 20 - 40 cm) after 8 and 18 years of decomposition.
Significantly higher decomposition constants (k) were found in logs of F. sylvatica (0.054 year-1) than in P. abies (0.033 year-1) and P. sylvestris (0.032 year-1). However,mass loss of P. sylvestris occurred mainly in sapwood and hence k for the whole wood may be overestimated. Decomposition rates generally decreased with increasing log diameter class except for smaller dimensions in P. abies. About 74 % of the variation in mass remaining could be explained by decomposition time (27 %),tree species (11 %),diameter (17 %),the interactive effects between tree species and diameter (4 %) as well as between decomposition time and tree species (3 %) and a random factor (site and tree; 9.5 %),whereas temperature explained only 2 %.
Wood fragmentation may play a more important role than previously thought. Here,between 14 % and 30 % of the decomposition rates (for the first 18 years) were attributable to this process. Carbon (C) density (mgC · ccm-3),which was initially highest for F. sylvatica,followed by P. sylvestris and P. abies,decreased with increasing decay stage to similar values for all species.
The apparent lack of climate effects on decomposition of logs in the field indicates that regional decomposition models for CWD may be developed on the basis of information on decomposition time,tree species and dimension only. These can then be used to predict C dynamics in CWD as input for C accounting models and for habitat management.
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Acknowledgements
We are grateful to Renate Nitschke and Germar Csapek, and the many students, who helped in the field and in the lab. We thank Sarah Grimm from Seminar for Statistics ETH Zurich for statistical advice. Oliver Jakoby provided helpful comments to improve the manuscript. This research was funded by a German Science Foundation grant to Jürgen Bauhus (DFG - BA 2821/4-1)
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