The vegetation history of an Amazonian domed peatland

Kelly, Thomas J. and Lawson, Ian T. and Roucoux, Katherine H. and Baker, Timothy R. and Jones, Timothy D. and Sanderson, Nicole K. (2017) The vegetation history of an Amazonian domed peatland. Palaeogeography, Palaeoclimatology, Palaeoecology, 468. pp. 129-141. ISSN 0031-0182

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Abstract

Abstract The peatland pole forests of the Pastaza-Marañón Foreland Basin (PMFB), Peru, are the most carbon-dense ecosystems known in Amazonia once below ground carbon stores are taken into account. Here we present the first multiproxy palaeoenvironmental record including pollen data from one of these peatlands, San Jorge in northern Peru, supported by an age model based on radiocarbon and 210Pb dating. The pollen data indicate that vegetation changes during the early phases of peat initiation resulted from autogenic succession in combination with fluvial influence. The overall pattern of vegetation change is not straightforward: the record does not reflect a process of unidirectional, progressive terrestrialization, but includes a reversal in the succession and vegetation transitions, which omit predicted successional phases. This complexity is similar to that seen in the only other existing pollen record from a PMFB peatland, at Quistococha, but contrasts with peat records from Panama and Southeast Asia where successional patterning appears more predictable. Our dating results provide the first evidence from a PMFB peatland that peat accumulation may have been discontinuous, with evidence for reduced rates of peat accumulation, or a possible hiatus, around 1300–400 cal yr BP. An ecological shift from open lake to palm swamp occurs at this time, possibly driven by climatic change. The pollen data indicate that the present pole forest vegetation at San Jorge began to assemble c. 200–150 cal yr BP. Given this young age, it is likely that the pole forest at this site remains in a state of transition.

Item Type:
Journal Article
Journal or Publication Title:
Palaeogeography, Palaeoclimatology, Palaeoecology
Additional Information:
This is the author’s version of a work that was accepted for publication in Palaeogeography, Palaeoclimatology, Palaeoecology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Palaeogeography, Palaeoclimatology, Palaeoecology, 468, 2017 DOI: 10.1016/j.palaeo.2016.11.039
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1910
Subjects:
ID Code:
83263
Deposited By:
Deposited On:
29 Nov 2016 11:40
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 03:37