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Tasmanian Native Forest Silviculture Technical Bulletin thinning regrowth Eucalyptus

Here is an interesting quote from the Forestry Tasmania Technical Bulletin - Thinning Regrowth Eucalypts. It may be of relevance when discussing the issue of prescription burns amongst other things.

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Forestry Tasmania (2001), Thinning Regrowth Eucalypts - Native Forest Silviculture Technical Bulletin No. 13 Second Edition, Forestry Tasmania

Planning Considerations

Fire Risk

One of the major planning constraints associated with thinning is the higher level of fuel present after the operations. It is not considered feasible in Tasmania to carry out fuel reduction burns in thinned coupes because of the high fuel loads and the sensitivity of the retained trees to fire. The location of thinned coupes amongst conventionally logged coupes is problematic, as it is not recommended that any regeneration burn take place within two kilometres of areas with high levels of flash fuel within two years of harvest (Cheney 1988).

 

Tree crowns (heads), bark, and other harvest residue make up the fuel load. The climate on the floor of the forest is altered by thinning, with higher wind speeds and temperature, lower humidity, and lower moisture content in the fuel itself. Understorey vegetation characteristics change because of these changes to the microclimate, especially increased light. Bracken ferns and cutting grass may grow vigorously, each having a far higher flammability than the replaced woody species (Cheney and Gould 1991).

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