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The legacy of mid-Holocene fire on a Tasmanian montane landscape

Citation

Fletcher, MS and Wolfe, BB and Whitlock, C and Pompeani, DP and Heijnis, H and Haberle, SG and Gadd, PS and Bowman, DMJS, The legacy of mid-Holocene fire on a Tasmanian montane landscape, Journal of Biogeography, 41, (3) pp. 476-488. ISSN 0305-0270 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 John Wiley & Sons Ltd

DOI: doi:10.1111/jbi.12229

Abstract

Aim: To assess the long-term impacts of landscape fire on a mosaic of pyrophobic and pyrogenic woody montane vegetation.

Location: South-west Tasmania, Australia.

Methods: We undertook a high-resolution multiproxy palaeoecological analysis of sediments deposited in Lake Osborne (Hartz Mountains National Park, southern Tasmania), employing analyses of pollen, macroscopic and microscopic charcoal, organic and inorganic geochemistry and magnetic susceptibility.

Results: Sequential fires within the study catchment over the past 6500 years have resulted in the reduction of pyrophobic rain forest taxa and the establishment of pyrogenic Eucalyptus-dominated vegetation. The vegetation change was accompanied by soil erosion and nutrient losses. The rate of post-fire recovery of widespread rain forest taxa (Nothofagus cunninghamii and Eucryphia spp.) conforms to ecological models, as does the local extinction of fire-sensitive rain forest taxa (Nothofagus gunnii and Cupressaceae) following successive fires.

Main conclusions: The sedimentary analyses indicate that recurrent fires over several centuries caused a catchment-wide transition from pyrophobic rain forest to pyrophytic eucalypt-dominated vegetation. The fires within the lake catchment during the 6500-year long record appear to coincide with high-frequency El Niño events in the equatorial Pacific Ocean, signalling a potential threat to these highly endemic rain forests if El Niño intensity amplifies as predicted under future climate scenarios.

Item Details

Item Type:Refereed Article
Keywords:athrotaxis, carbon, charcoal particles, Eucalyptus, fire, ITRAX, nitrogen, Nothofagus, rain forest, Southern Hemisphere
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Landscape Ecology
Objective Division:Environment
Objective Group:Natural Hazards
Objective Field:Natural Hazards in Forest and Woodlands Environments
Author:Bowman, DMJS (Professor David Bowman)
ID Code:98755
Year Published:2014
Funding Support:Australian Research Council (DP110101950)
Web of Science® Times Cited:14
Deposited By:Plant Science
Deposited On:2015-02-27
Last Modified:2017-10-31
Downloads:0

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