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Ecosystems

, Volume 16, Issue 7, pp 1262–1272 | Cite as

Woody Debris Volume Depletion Through Decay: Implications for Biomass and Carbon Accounting

  • Shawn Fraver
  • Amy M. Milo
  • John B. Bradford
  • Anthony W. D’Amato
  • Laura Kenefic
  • Brian J. Palik
  • Christopher W. Woodall
  • John Brissette
Article

Abstract

Woody debris decay rates have recently received much attention because of the need to quantify temporal changes in forest carbon stocks. Published decay rates, available for many species, are commonly used to characterize deadwood biomass and carbon depletion. However, decay rates are often derived from reductions in wood density through time, which when used to model biomass and carbon depletion are known to underestimate rate loss because they fail to account for volume reduction (changes in log shape) as decay progresses. We present a method for estimating changes in log volume through time and illustrate the method using a chronosequence approach. The method is based on the observation, confirmed herein, that decaying logs have a collapse ratio (cross-sectional height/width) that can serve as a surrogate for the volume remaining. Combining the resulting volume loss with concurrent changes in wood density from the same logs then allowed us to quantify biomass and carbon depletion for three study species. Results show that volume, density, and biomass follow distinct depletion curves during decomposition. Volume showed an initial lag period (log dimensions remained unchanged), even while wood density was being reduced. However, once volume depletion began, biomass loss (the product of density and volume depletion) occurred much more rapidly than density alone. At the temporal limit of our data, the proportion of the biomass remaining was roughly half that of the density remaining. Accounting for log volume depletion, as demonstrated in this study, provides a comprehensive characterization of deadwood decomposition, thereby improving biomass-loss and carbon-accounting models.

Keywords

carbon cycle coarse woody debris deadwood decay constant decay rate decomposition forest dynamics forest biomass forest fuels habitat structure 

Notes

Acknowledgments

We thank J. Elioff, A. Elling, D. Kastendick, T. O’Brien, R. Severs, T. Burk, H. Hutchins, and G. Mehmel for alerting us to sites with known tree mortality dates and J. Elioff for assistance in the field. Comments from B.G. Jonsson, M. Russell, two anonymous reviewers, and the subject-matter editor substantially improved the manuscript. Support was provided by the US Forest Service Northern Research Station, and the Joint Fire Science Program (Project 08-1-5-04). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Supplementary material

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Supplementary material 1 (DOCX 23 kb)
10021_2013_9682_MOESM2_ESM.docx (24 kb)
Supplementary material 2 (DOCX 12 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Shawn Fraver
    • 1
  • Amy M. Milo
    • 2
  • John B. Bradford
    • 3
  • Anthony W. D’Amato
    • 1
  • Laura Kenefic
    • 4
  • Brian J. Palik
    • 5
  • Christopher W. Woodall
    • 6
  • John Brissette
    • 7
  1. 1.Department of Forest ResourcesUniversity of MinnesotaSt. PaulUSA
  2. 2.Department of Biological SciencesGeorge Washington UniversityWashington, DCUSA
  3. 3.Southwest Biological Science CenterUS Geological SurveyFlagstaffUSA
  4. 4.Northern Research StationUS Forest ServiceBradleyUSA
  5. 5.Northern Research StationUS Forest ServiceGrand RapidsUSA
  6. 6.Northern Research StationUS Forest ServiceSt. PaulUSA
  7. 7.Northern Research StationUS Forest ServiceDurhamUSA

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