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Lookup NU author(s): Professor Yit Arn TehORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Stem respiration constitutes a substantial proportion of autotrophic respiration in forested ecosystems, but its drivers across different spatial scales and land-use gradients remain poorly understood. This study quantifies and examines the impact of logging disturbance on stem CO2 efflux (EA) in Malaysian Borneo. EA was quantified at tree- and stand-level in nine 1-ha plots over a logging gradient from heavily logged to old-growth using the static chamber method.<br /> Tree-level results showed higher EA per unit stem area in logged vs old-growth plots (37.0 +/- 1.1 vs 26.92 +/- 1.14 g C m(-2) month(-1)). However, at stand-level, there was no difference in EA between logged and old-growth plots (6.7 +/- 1.1 vs 6.0 +/- 0.7 Mg C ha(-1) yr(-1)) due to greater stem surface area in old-growth plots. Allocation to growth respiration and carbon use efficiency was significantly higher in logged plots. Variation in EA at both tree- and stand-level was driven by tree size, growth and differences in investment strategies between the forest types.<br /> These results reflect different resource allocation strategies and priorities, with a priority for growth in response to increased light availability in logged plots, while old-growth plots prioritise maintenance and cell structure.
Author(s): Mills MB, Both S, Jotan P, Huasco WH, Cruz R, Pillco MM, Burslem DFRP, Maycock C, Malhi Y, Ewers RM, Berrio JC, Kaduk J, Page S, Robert R, Teh YA, Riutta T
Publication type: Article
Publication status: Published
Journal: New Phytologist
Year: 2024
Volume: 244
Issue: 1
Pages: 91-103
Print publication date: 01/10/2024
Online publication date: 15/08/2024
Acceptance date: 18/07/2024
Date deposited: 04/12/2024
ISSN (print): 0028-646X
ISSN (electronic): 1469-8137
Publisher: Wiley-Blackwell Publishing Ltd
URL: https://doi.org/10.1111/nph.20043
DOI: 10.1111/nph.20043
Data Access Statement: Dataset of stem CO2 efflux for individual trees is available at doi: 10.5281/zenodo.12799889, plant functional traits for individual trees at doi: 10.5281/zenodo.3247631 and community-weighted mean traits at doi: 10.5281/zenodo.3247602, anatomical wood traits at doi: 10.5281/zenodo.5513918, and stand-level carbon budget including stem respiration at doi: 10.5281/zenodo.7307449.
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