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Ecosystems

, Volume 22, Issue 6, pp 1189–1205 | Cite as

Dead Wood Necromass in a Moist Tropical Forest: Stocks, Fluxes, and Spatiotemporal Variability

  • Evan M. GoraEmail author
  • Riley C. Kneale
  • Markku Larjavaara
  • Helene C. Muller-Landau
Article

Abstract

Woody debris (WD) stocks and fluxes are important components of forest carbon budgets and yet remain understudied, particularly in tropical forests. Here we present the most comprehensive assessment of WD stocks and fluxes yet conducted in a tropical forest, including one of the first tropical estimates of suspended WD. We rely on data collected over 8 years in an old-growth moist tropical forest in Panama to quantify spatiotemporal variability and estimate minimum sample sizes for different components. Downed WD constituted the majority of total WD mass (78%), standing WD contributed a substantial minority (21%), and suspended WD was the smallest component (1%). However, when considering sections of downed WD that are elevated above the soil, the majority of WD inputs and approximately 50% of WD stocks were disconnected from the forest floor. Branchfall and liana wood accounted for 17 and 2% of downed WD, respectively. Residence times averaged 1.9 years for standing coarse WD (CWD; > 20 cm diameter) and 3.6 years for downed CWD. WD stocks and inputs were highly spatially variable, such that the sampling efforts necessary to estimate true values within 10% with 95% confidence were > 130 km of transects for downed CWD and > 550 ha area for standing CWD. The vast majority of studies involve much lower sampling efforts, suggesting that considerably more data are required to precisely quantify tropical forest WD pools and fluxes. The demonstrated importance of elevated WD in our study indicates a need to understand how elevation above the ground alters decomposition rates and incorporate this understanding into models of forest carbon cycling.

Keywords

carbon cycling decomposition snag coarse woody debris suspended woody debris branchfall Panama liana 

Notes

Acknowledgements

We thank Oris Acevedo, Melissa Cano, and the Smithsonian Tropical Research Institute for logistical support. We thank Pablo Ramos and Paulino Villarreal for field assistance. Comments from two anonymous reviewers improved the manuscript. This research was supported in part by the HSBC Climate Partnership and the Smithsonian ForestGEO Program through H.C. Muller-Landau, and a Smithsonian Tropical Research Institute Fellowship and NSF Grant GRF-2015188266 to E.M. Gora.

Supplementary material

10021_2019_341_MOESM1_ESM.pdf (667 kb)
Supplementary material 1 (PDF 666 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Evan M. Gora
    • 1
    Email author
  • Riley C. Kneale
    • 1
  • Markku Larjavaara
    • 2
  • Helene C. Muller-Landau
    • 3
  1. 1.Department of BiologyUniversity of LouisvilleLouisvilleUSA
  2. 2.Department of Forest Sciences, Viikki Tropical Resources Institute (VITRI)University of HelsinkiHelsinkiFinland
  3. 3.Smithsonian Tropical Research InstituteBalboa, AnconRepublic of Panama

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