Skip to Main Content
Temporal trends and sources of variation in carbon flux from coarse woody debris in experimental forest canopy openingsAuthor(s): J. A. Forrester; D. J. Mladenoff; A. W. D'Amato; S. Fraver; Daniel Lindner; N. J. Brazee; M. K. Clayton; S. T. Gower
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
Download Publication (0 B)
DescriptionPulses of respiration from coarse woody debris (CWD) have been observed immediately following canopy disturbances, but it is unclear how long these pulses are sustained. Several factors are known to influence carbon flux rates from CWD, but few studies have evaluated more than temperature and moisture. We experimentally manipulated forest structure in a second-growth northern hardwood forest and measured CO2 flux periodically for seven growing seasons following gap creation. We present an analysis of which factors, including the composition of the wood-decay fungal community influence CO2 flux. CO2 flux from CWD was strongly and positively related to wood temperature and varied significantly between substrate types (logs vs. stumps). For five growing seasons after treatment, the CO2 flux of stumps reached rates up to seven times higher than that of logs. CO2 flux of logs did not differ significantly between canopy-gap and closed-canopy conditions in the fourth through seventh post-treatment growing seasons. By the seventh season, the seasonal carbon flux of both logs and stumps had decreased significantly from prior years. Linear mixed models indicated the variation in the wood inhabiting fungal community composition explained a significant portion of variability in the CO2 flux along with measures of substrate conditions. CO2 flux rates were inversely related to fungal diversity, with logs hosting more species but emitting less CO2 than stumps. Overall, our results suggest that the current treatment of CWD in dynamic forest carbon models may be oversimplified, thereby hampering our ability to predict realistic carbon fluxes associated with wood decomposition.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationForrester, J. A.; Mladenoff, D. J.; D'Amato, A. W.; Fraver, S.; Lindner, D. L.; Brazee, N. J.; Clayton, M. K.; Gower, S. T. 2015. Temporal trends and sources of variation in carbon flux from coarse woody debris in experimental forest canopy openings. Oecologia, Vol. 179(3): 12 pages.: 889-900.
KeywordsCanopy gap, Carbon flux, Coarse woody debris, Heterotrophic respiration, Stumps, Wood-decay fungi
- Disturbance and diversity of wood-inhabiting fungi: effects of canopy gaps and downed woody debris
- Temperature responses of carbon dioxide fluxes from coarse dead wood in a black ash wetland
- Effects of canopy opening and debris deposition on fungal connectivity, phosphorus movement between litter cohorts and mass loss
XML: View XML