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Deep instability of deforested tropical peatlands revealed by fluvial organic carbon fluxes

Moore, Sam; Evans, Chris D.; Page, Susan E.; Garnett, Mark H.; Jones, Tim G.; Freeman, Chris; Hooijer, Aljosja; Wiltshire, Andrew J.; Limin, Suwido H. and Gauci, Vincent (2013). Deep instability of deforested tropical peatlands revealed by fluvial organic carbon fluxes. Nature, 493 pp. 660–663.

DOI (Digital Object Identifier) Link: https://doi.org/10.1038/nature11818
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Abstract

Tropical peatlands contain one of the largest pools of terrestrial organic carbon, amounting to about 89,000 teragrams 1 (1 Tg is a billion kilograms). Approximately 65 per cent of this carbon store is in Indonesia, where extensive anthropogenic degradation in the form of deforestation, drainage and fire are converting it into a globally significant source of atmospheric carbon dioxide. Here we quantify the annual export of fluvial organic carbon from both intact peat swamp forest and peat swamp forest subject to past anthropogenic disturbance. We find that the total fluvial organic carbon flux from disturbed peat swamp forest is about 50 per cent larger than that from intact peat swamp forest. By carbon-14 dating of dissolved organic carbon (which makes up over 91 per cent of total organic carbon), we find that leaching of dissolved organic carbon from intact peat swamp forest is derived mainly from recent primary production (plant growth). In contrast, dissolved organic carbon from disturbed peat swamp forest consists mostly of much older (centuries to millennia) carbon from deep within the peat column. When we include the fluvial carbon loss term, which is often ignored, in the peatland carbon budget, we find that it increases the estimate of total carbon lost from the disturbed peatlands in our study by 22 per cent. We further estimate that since 1990 peatland disturbance has resulted in a 32 per cent increase in fluvial organic carbon flux from southeast Asia—an increase that is more than half of the entire annual fluvial organic carbon flux from all European peatlands. Our findings emphasize the need to quantify fluvial carbon losses in order to improve estimates of the impact of deforestation and drainage on tropical peatland carbon balances.

Item Type: Journal Item
Copyright Holders: 2013 Macmillan Publishers Limited
ISSN: 1476-4687
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNE/F008813/1NERC (Natural Environment Research Council)
Keywords: environmental monitoring; biogeochemistry; ecosystem ecology
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: OpenSpace Research Centre (OSRC)
Related URLs:
Item ID: 36546
Depositing User: Vincent Gauci
Date Deposited: 06 Feb 2013 14:26
Last Modified: 07 Dec 2018 10:13
URI: http://oro.open.ac.uk/id/eprint/36546
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