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Contracting Tasmanian montane grasslands within a forest matrix is consistent with cessation of Aboriginal fire management

Citation

Bowman, DMJS and Wood, SW and Neyland, D and Sanders, GJ and Prior, LD, Contracting Tasmanian montane grasslands within a forest matrix is consistent with cessation of Aboriginal fire management, Austral Ecology, 38, (6) pp. 627-638. ISSN 1442-9985 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 the authors and Ecological Society of Australia

DOI: doi:10.1111/aec.12008

Abstract

The persistence of treeless grasslands and sedgelands within a matrix of eucalypt and rainforest vegetation in the montane plateaux of northern Tasmania has long puzzled ecologists. Historical sources suggest that Tasmanian Aborigines were burning these treeless patches and models seeking to explain their maintenance generally include fire, soil properties and Aboriginal landscape burning. We aimed to provide a new historical perspective of the dynamics of the vegetation mosaics of Surrey Hills and Paradise Plains in north-west and north-east Tasmania, respectively, and used vegetation surveys and soil sampling to explore the role of vegetation and soils in these dynamics. Sequences of historical maps (1832 and 1903) and aerial photography showed that many treeless patches have persisted in the landscape since European settlement and that forests have rapidly expanded into the treeless patches since the early 1950s. Stand structure and floristic data described an expanding forest dominated by Leptospermum, which is consistent with vegetation succession models for the region. Soils under expanding forest boundaries did not have higher soil nitrogen or phosphorus than those under stable boundaries, signalling a lack of edaphic limitation to forest expansion. The magnitude of forest expansion at Paradise Plains (granite), Surrey Hills (basalt) and south-west Tasmania (quartzite) appears to follow a nutrient availability gradient and this hypothesis is backed by differences in soil phosphorus capital between the three systems. Given that existing vegetation boundaries in northern Tasmania do not coincide with soil nutrient gradients, we suggest that treeless vegetation was maintained by Aboriginal landscape burning and that the recent contraction of treeless vegetation is related to the breakdown of these fire regimes following European settlement. The observed rates of forest expansion could result in a substantial loss of these grasslands if sustained through this century and therefore our work supports the continuation of prescribed burning to maintain this high conservation value ecosystem.

Item Details

Item Type:Refereed Article
Keywords:fire ecology, landscape change, repeat aerial photography, soil phosphorus, vegetation dynamics
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Landscape Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Forest and Woodlands Flora, Fauna and Biodiversity
Author:Bowman, DMJS (Professor David Bowman)
Author:Wood, SW (Mr Samuel Wood)
Author:Neyland, D (Mr Dominic Neyland)
Author:Sanders, GJ (Mr Gregor Sanders)
Author:Prior, LD (Dr Lynda Prior)
ID Code:82201
Year Published:2012
Funding Support:Australian Research Council (DP0878177)
Web of Science® Times Cited:13
Deposited By:Plant Science
Deposited On:2013-01-21
Last Modified:2017-10-06
Downloads:0

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