Fire-patterned vegetation and the development of organic soils in the lowland vegetation mosaics of south-west Tasmania
S. W. Wood A C , Q. Hua B and D. M. J. S. Bowman A
+ Author Affiliations
- Author Affiliations
A School of Plant Science, Private Bag 55, University of Tasmania, Hobart, Tas. 7001, Australia.
B Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
C Corresponding author. Email: swwood@utas.edu.au
Australian Journal of Botany 59(2) 126-136 https://doi.org/10.1071/BT10309
Submitted: 18 November 2010 Accepted: 21 February 2011 Published: 28 March 2011
Abstract
Two contrasting ecological models have been proposed for the forest–moorland vegetation mosaics of south-west Tasmania that stress different interactions between fire, soils, vegetation and the physical environment to produce either stable or dynamic vegetation patterns. We investigated aspects of these models by sampling organic soil profiles across vegetation mosaics to determine variation in soil depth, organic carbon (C) content, nutrient capital, stable C isotope composition (δ13C) and 14C radiocarbon age in two contrasting landscape settings. 14C basal ages of organic soils ranged from recent (<400 calibrated (cal.) years BP) to mid Holocene (~7200 cal. years BP), with a tendency for older soils to be from poorly drained moorlands and younger soils from the forest. The long-term net rate of C accumulation ranged from 2.7 to 19.2 gC m–2 year–1, which is low compared with northern hemisphere peatland systems. We found that δ13C in organic soil profiles cannot be used to infer Holocene vegetation boundary dynamics in these systems. We found a systematic decrease of phosphorus from rainforest through eucalypt to moorland, but estimated that phosphorus capital in moorland soils was still sufficient for the development of forest vegetation. Our results suggest that the characteristics of organic soils across the landscape are the result of interactions between not only vegetation and fire frequency, but also other factors such as drainage and topography.
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