Nottingham, AT orcid.org/0000-0001-9421-8972, Cheesman, AW, Riutta, T et al. (9 more authors) (2022) Large contribution of recent photosynthate to soil respiration in tropical dipterocarp forest revealed by girdling. Journal of Ecology, 110 (2). pp. 387-403. ISSN 0022-0477
Abstract
1. Tropical forests are the most productive terrestrial ecosystems, fixing over 40 Pg of carbon from the atmosphere each year. A substantial portion of this carbon is allocated below-ground to roots and root-associated micro-organisms. However, there have been very few empirical studies on the dynamics of this below ground transfer, especially in tropical forests where carbon allocation processes are influenced by high plant species diversity.
2. We used a whole-stand girdling experiment to halt the below-ground transfer of recent photosynthates in a lowland tropical forest in Borneo. By girdling 209 large trees in a 0.48 ha plot, we determined: (a) the contribution of recent photosynthate to root-rhizosphere respiration and; (b) the relationships among the disruption of this below-ground carbon supply, tree species composition and mortality.
3. Mortality of the 209 trees was 62% after 370 days, with large variation among species and particularly high mortality within the Dipterocarpaceae (99%) and Fagaceae (100%) families. We also observed a higher risk of mortality following girdling for species with lower wood density.
4. Soil CO2 emissions declined markedly (36 ± 5%) over ~50 days following girdling in three of six monitored subplots. In the other three subplots there was either a marginal decline or no response of soil CO2 emissions to girdling. The decrease in soil CO2 efflux was larger in subplots with dominance of Dipterocarpaceae.
5. Synthesis. Our results indicate high spatial variation in the coupling of below-ground carbon allocation and root-rhizosphere respiration in this tropical forest, with a closer coupling in forest dominated by Dipterocarpaceae. Our findings highlight the implications of tree species composition of tropical forests in affecting the dynamics of below-ground carbon transfer and its release to the atmosphere.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 British Ecological Society. This is the peer reviewed version of the following article: Nottingham, A. T., Cheesman, A. W., Riutta, T., Doughty, C. E., Telford, E., Huaraca Huasco, W., Svátek, M., Kvasnica, J., Majalap, N., Malhi, Y., Meir, P., & Arn Teh, Y. (2021). Large contribution of recent photosynthate to soil respiration in tropical dipterocarp forest revealed by girdling. Journal of Ecology, 00, 1– 17., which has been published in final form at https://doi.org/10.1111/1365-2745.13806. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
Keywords: | autotrophic respiration; below-ground carbon allocation; heterotrophic respiration; plant–soil interactions; SAFE project; soil CO2 efflux; terrestrial carbon cycle; tree mortality |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Ecology & Global Change (Leeds) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/T012226/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 06 Jan 2022 16:20 |
Last Modified: | 06 Dec 2022 01:13 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1111/1365-2745.13806 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:181734 |