Chemical characterisation of bog peat and dried peat of the Australian Alps
S. P. P. Grover A B , B. M. McKenzie A C , J. A. Baldock B D and W. A. Papst AA Centre for Applied Alpine Ecology, Department of Agricultural Sciences, La Trobe University, Vic. 3086, Australia.
B CRC for Greenhouse Accounting, GPO Box 475, Canberra, ACT 2601, Australia.
C Current address: Scottish Crop Research Institute, Invergowrie, Dundee DD25DA, Scotland.
D CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064, Australia.
Australian Journal of Soil Research 43(8) 963-971 https://doi.org/10.1071/SR04014
Submitted: 29 January 2004 Accepted: 1 September 2005 Published: 8 December 2005
Abstract
The importance of bogs in the catchment hydrology of the Australian Alps has been long recognised but little studied. Damaged bogs are thought to be the source of dried peats now common throughout the Alps. We described the characteristics of a bog peat and a dried peat, to better understand the relationship between the two. Standard chemical properties of peat were measured: pH, loss on ignition, gravimetric contents of carbon and nitrogen, and electrical conductivity. We also measured the concentrations of total and plant-available elements, and the chemical composition of the organic carbon, leading to a measure of the extent of decomposition. The results suggest that this is a typical Sphagnum bog peat—low pH, high carbon content—and the distribution of carbon groups and other elements reflect the stable water source of this groundwater-fed Sphagnum bog. The properties of the dried peat were most similar to the catotelm (lower layer) of the bog peat. This resemblance, combined with decades of field observations, indicates that dried peat may form from the catotelm of bog peat, after the acrotelm (upper layer) dries and erodes. These results have implications for the management of Alps catchments, and further studies are needed to ascertain the hydrologic and carbon cycling roles of organic soils in the Australian Alps.
Additional keywords: Sphagnum, 13C nuclear magnetic resonance, humified peat.
Acknowledgments
Ken Rowe made valuable contributions to this work, both in the field and through discussions. We thank Joe Edwards and Allan Lee for technical support. Josephine Machunter and Peter Lawrence assisted us with fieldwork. Ron Smernik and Evelyn Krull and anonymous reviewers made helpful comments on the manuscript.
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