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A log of Eucalyptus obliqua in decay-class 4. |
Image: Simon Grove |
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Project summary:
One of the advantages of conducting research in an LTER site is the ability to build on others’ research. To do this effectively, it is important that those projects exploring similar aspects of ecology are based on a shared understanding of how that aspect can be described and categorised. The decomposition of coarse woody debris is a case in point. While it would be possible to categorise its decomposition using any number of decay-classes, in practice just five have proven to be sufficient for most purposes in the lowland wet eucalypt forest at Warra, where most CWD is derived from the much-studied Eucalyptus obliqua. Since this five-class system seems to work acceptably well for CWD derived from other local tree species too, researchers conducting projects at Warra are strongly encouraged to adopt it. This is not to preclude the possibility of individual researchers using their own systems, but it is important that these remain compatible with the five-class system summarised here so that the resultant datasets also remain compatible.
Decay-class 1: Structurally intact or almost so; bark or small branches still attached; few signs of wood decay; wood mostly retains original colour.
Decay-class 1: Structurally less intact but still hard when kicked; small branches absent; little or no bark present; early signs of wood decay or discolouration.
Decay-class 1: Clearly decaying but still supports its own weight; may be slightly soft when kicked; may be hollow in places; no bark; moss and fungi may be prominent.
Decay-class 1: Cannot support its own weight; soft to kick (but may still be hard in places, in which case may be extensively hollow); moss, fungi and invading roots likely.
Decay-class 1: No longer retains original shape; wood very soft or largely disintegrated; sometimes only outline visible beneath moss and invading roots etc.
Download a pdf (744kb) illustrating this decay-class system, suitable for use in the field.
Methodology: Compilation of information from recognised experts
Datasets: None available.
Publications: Grove, S.J., Stamm, L. & Barry, C. (2009). Log decomposition rates in Tasmanian Eucalyptus obliqua determined using an indirect chronosequence approach. Forest Ecology and Management 258: 389-397.
Meggs, J.M. (1996). Pilot study of the effects of modern logging practices on the decaying-log habitat in wet eucalypt forest in South-East Tasmania: report to the Tasmanian RFA Environment and Heritage Technical Committee Forestry Tasmania, Hobart, Tasmania, Australia.
Stamm, L. (2007). Decomposition in Tasmanian Eucalyptus obliqua coarse woody debris. Honours thesis, University of Tasmania, Hobart.
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