Ecosystem state shifts during long-term development of an Amazonian peatland

Swindles, Graeme, Morris, Paul, Whitney, Bronwen, Galloway, Jennifer, Gałka, Mariusz, Gallego-Sala, Angela, Macumber, Andrew, Mullan, Donal, Smith, Mark, Amesbury, Matthew, Roland, Thomas, Sanei, Hamed, Patterson, R.Timothy, Sanderson, Nicole, Parry, Lauren, Charman, Dan, Lopez, Omar, Valderamma, Elvis, Watson, Elizabeth, Ivanovic, Ruza, Valdes, Paul, Turner, T.Edward and Lähteenoja, Outi (2018) Ecosystem state shifts during long-term development of an Amazonian peatland. Global Change Biology, 24 (2). pp. 738-757. ISSN 1354-1013

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Official URL: https://doi.org/10.1111/gcb.13950

Abstract

The most carbon (C)‐dense ecosystems of Amazonia are areas characterized by the presence of peatlands. However, Amazonian peatland ecosystems are poorly understood and are threatened by human activities. Here, we present an investigation into long‐term ecohydrological controls on C accumulation in an Amazonian peat dome. This site is the oldest peatland yet discovered in Amazonia (peat initiation ca. 8.9 ka BP), and developed in three stages: (i) peat initiated in an abandoned river channel with open water and aquatic plants; (ii) inundated forest swamp; and (iii) raised peat dome (since ca. 3.9 ka BP). Local burning occurred at least three times in the past 4,500 years. Two phases of particularly rapid C accumulation (ca. 6.6–6.1 and ca. 4.9–3.9 ka BP), potentially resulting from increased net primary productivity, were seemingly driven by drier conditions associated with widespread drought events. The association of drought phases with major ecosystem state shifts (open water wetland–forest swamp–peat dome) suggests a potential climatic control on the developmental trajectory of this tropical peatland. A third drought phase centred on ca. 1.8–1.1 ka BP led to markedly reduced C accumulation and potentially a hiatus during the peat dome stage. Our results suggest that future droughts may lead to phases of rapid C accumulation in some inundated tropical peat swamps, although this can lead ultimately to a shift to ombrotrophy and a subsequent return to slower C accumulation. Conversely, in ombrotrophic peat domes, droughts may lead to reduced C accumulation or even net loss of peat. Increased surface wetness at our site in recent decades may reflect a shift towards a wetter climate in western Amazonia. Amazonian peatlands represent important carbon stores and habitats, and are important archives of past climatic and ecological information. They should form key foci for conservation efforts.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Swindles, G. T., Morris, P. J., Whitney, B., Galloway, J. M., Gałka, M., Gallego-Sala, A., Macumber, A. L., Mullan, D., Smith, M. W., Amesbury, M. J., Roland, T. P., Sanei, H., Patterson, R.Timothy., Sanderson, N., Parry, L., Charman, D. J., Lopez, O., Valderamma, E., Watson, E. J., Ivanovic, R. F., Valdes, P. J., Turner, T.Edward. and Lähteenoja, O. (2017), Ecosystem state shifts during long-term development of an Amazonian peatland., which has been published in final form at http://dx.doi.org/10.1111/gcb.13950. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords: tropical peatland, peat, swamp, Amazon rainforest, Holocene, carbon accumulation, Palaeoecology, climate, Peru
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Ay Okpokam
Date Deposited: 30 Oct 2017 16:22
Last Modified: 12 May 2018 09:54
URI: http://nrl.northumbria.ac.uk/id/eprint/32420

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