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Topographic variation in burning-induced loss of carbon from organic soils in Tasmanian moorlands

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de Folco, M-B F and Kirkpatrick, JB (2011) Topographic variation in burning-induced loss of carbon from organic soils in Tasmanian moorlands. Catena, 87 (2). pp. 216-225. ISSN 0341-8162

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Abstract

Although it is known that cool fire can result in carbon loss in organic soils, data are lacking on the effects of
such fire on the distinctive lowland organic soils of the southern hemisphere and on the relationship of fire induced
carbon loss to topography. We established an experiment to determine the effects of a low severity
burn on organic and total mass of soils, the position of the water table and vegetation cover. We recorded soil
losses directly after the fire, after the first rain and after 4 years. We also recorded losses as a result of the first
rain and at 4 years after a wildfire at another locality with the same vegetation and topography. We compared
soil surface temperatures over summer between burned and unburned moorland. The planned fire resulted in
substantial soil and carbon losses, which, up to 4 years after the wildfire, occurred mostly as a result of the fire
itself and the first rains. The topographic wetness index was strongly related to soil and organic matter loss for
the pooled data for both sites, while fire severity, slope and vegetation cover were less predictive. Burning
increased dissolved organic material in streams; the depth of the water table; and, soil temperatures. The
continuing soil loss on slopes 18 years after fire contrasts with faster recovery on the shelves and in the basins,
reflecting a strong topographic component in variation. Fire is a major influence on the depth of the organic
soils of the southern hemisphere, as in the northern hemisphere. The influence of fire on soils varies markedly
between topographic positions, with the time interval between fires that would maintain organic soils in
basins being markedly less than that necessary to maintain organic soils on slopes. The topographic effect
appears to be a consequence of relative drying rather than relative exposure to water or aeolian erosion or
differences in fire severity.

Item Type: Article
Journal or Publication Title: Catena
Page Range: pp. 216-225
ISSN: 0341-8162
Identification Number - DOI: 10.1016/j.catena.2011.06.003
Additional Information:

The definitive version is available at http://www.sciencedirect.com

Date Deposited: 25 Aug 2011 06:43
Last Modified: 18 Nov 2014 04:21
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