Technical Note: Linking climate change and downed woody debris decomposition across forests of the eastern United States

Biogeosciences
By: , and 

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Abstract

Forest ecosystems play a critical role in mitigating greenhouse gas emissions. Forest carbon (C) is stored through photosynthesis and released via decomposition and combustion. Relative to C fixation in biomass, much less is known about C depletion through decomposition of woody debris, particularly under a changing climate. It is assumed that the increased temperatures and longer growing seasons associated with projected climate change will increase the decomposition rates (i.e., more rapid C cycling) of downed woody debris (DWD); however, the magnitude of this increase has not been previously addressed. Using DWD measurements collected from a national forest inventory of the eastern United States, we show that the residence time of DWD may decrease (i.e., more rapid decomposition) by as much as 13% over the next 200 years, depending on various future climate change scenarios and forest types. Although existing dynamic global vegetation models account for the decomposition process, they typically do not include the effect of a changing climate on DWD decomposition rates. We expect that an increased understanding of decomposition rates, as presented in this current work, will be needed to adequately quantify the fate of woody detritus in future forests. Furthermore, we hope these results will lead to improved models that incorporate climate change scenarios for depicting future dead wood dynamics in addition to a traditional emphasis on live-tree demographics.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Technical Note: Linking climate change and downed woody debris decomposition across forests of the eastern United States
Series title Biogeosciences
DOI 10.5194/bg-11-6417-2014
Volume 11
Year Published 2014
Language English
Publisher European Geosciences Union
Contributing office(s) Southwest Biological Science Center
Description 9 p.
First page 6417
Last page 6425
Country United States
Online Only (Y/N) N
Additional Online Files (Y/N) N