Shifts in internal stem damage along a tropical precipitation gradient and implications for forest biomass estimation

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1111/nph.19417. This is version 2 of this Preprint.

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Authors

Habacuc Flores-Moreno, Abbey R Yatsko, Alexander W Cheeseman, Steven D Allison, Lucas A Cernusak, Rose Cheney, Rebecca Clement, Wendy Cooper, Paul Eggleton, Rigel Jensen, Marc Rosenfield, Amy E Zanne

Abstract

Woody biomass is a large carbon store in terrestrial ecosystems. In calculating biomass, tree stems are assumed to be solid structures. However, decomposer agents such as microbes and insects target stem heartwood, causing internal wood decay which is poorly quantified.
We investigated internal stem damage across five sites in tropical Australia along a precipitation gradient. We estimated the amount of internal aboveground biomass damaged in living trees and measured four potential stem damage predictors: wood density, stem diameter, annual precipitation, and termite pressure (measured as termite damage in downed deadwood).
Stem damage increased with increasing diameter, wood density, and termite pressure and decreased with increasing precipitation. High wood density stems sustained less damage in wet sites and more damage in dry sites, likely a result of shifting decomposer communities and their differing responses to changes in tree species and wood traits across sites.
Incorporating stem damage reduced aboveground biomass estimates by > 30% in Australian savannas, compared to only 3% in rainforests. Accurate estimates of carbon storage across woody plant communities are critical for understanding the global carbon budget. Future biomass estimates should consider stem damage in concert with the effects of changes in decomposer communities and abiotic conditions.

DOI

https://doi.org/10.32942/X24P48

Subjects

Ecology and Evolutionary Biology, Life Sciences

Keywords

internal stem damage, decomposition, carbon storage, plant biomass, Precipitation, decay, termites

Dates

Published: 2023-07-10 21:50

Last Updated: 2023-12-14 15:27

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License

CC BY Attribution 4.0 International

Additional Metadata

Language:
English

Conflict of interest statement:
None

Data and Code Availability Statement:
Open data/code are not available.