After the Fire: Leadbeater's Long Journey: Life Is Slowly Returning to the Wet Mountain Ash Forests Burned in Victoria's 2009 Black Saturday Fires. Yet, the Future of These Forest Communities-Symbolised by the Iconic Leadbeater's Possum-Is by No Means Guaranteed, Warns a Group of Ecologists in Their Compelling New Book, Forest Phoenix

By Lindenmayer, David; Blair, David et al. | Ecos, October-November 2010 | Go to article overview

After the Fire: Leadbeater's Long Journey: Life Is Slowly Returning to the Wet Mountain Ash Forests Burned in Victoria's 2009 Black Saturday Fires. Yet, the Future of These Forest Communities-Symbolised by the Iconic Leadbeater's Possum-Is by No Means Guaranteed, Warns a Group of Ecologists in Their Compelling New Book, Forest Phoenix


Lindenmayer, David, Blair, David, McBurney, Lachlan, Banks, Sam, Ecos


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Montane ash forests are truly spectacular, and contain the tallest flowering plants in the world. Some of the world's most enigmatic and iconic animal species, of which several are threatened or endangered, are also found in the Central Highlands of Victoria. For example, virtually the entire known distribution of the nationally endangered Leadbeater's possum, one of the state's faunal emblems, occurs in the montane ash forests of this region.

Animal population recovery after fire, whether it commences through survival or recolonisation, is intimately tied to the structure and recovery of the plants in the forest. In the long term, the death of and damage to standing trees resulting from wildfires can stimulate the development of hollow tree cavities. These hollows are essential habitat for many animals, and are most likely to form in large trees.

Standing, burned large trees that contain hollows can make a regenerating stand suitable for Leadbeater's possums within 10 years of a fire. However, burned young forest that does not contain these biological legacies will not provide suitable habitat for Leadbeater's possums for the 100-200 years that it takes for mountain ash trees to mature and begin to form hollows.

The prevalence of trees with hollows in a recently burnt stand is dependent on a number of factors, including:

* the age of the forest at the time it was burned--more large hollow-bearing trees occur in an old-growth stand than in young forest

* whether the trees were alive or dead immediately before the fire--dead trees are far more susceptible to being fully consumed by a fire than living trees

* the severity of a fire--a high severity fire will remove all large dead trees in a stand.

Large areas of montane ash forests have been logged for the production of pulp and timber, which also decreases the available Leadbeater's possum habitat. About 75-80 per cent of ash-type forest in Victoria's Central Highlands region is broadly designated for wood production.

The traditional kind of logging in montane ash forests is clearfelling. Of the areas of montane ash forest subject to logging, more than 95 per cent are clearfelled. Under this method of cutting, virtually all standing trees are removed from a 15-40 hectare area in a single operation, leaving few hive standing trees.

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Clearfelling has been a highly controversial form of logging in Australian forests, in part because of its impacts on values such as biodiversity conservation. In particular, it either removes the majority of large old trees from a stand, or rapidly accelerates the decay and collapse of those large trees that are retained. These key attributes of forests do not redevelop in a harvested area for a century or more.

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Clearfelling is also the typical form of post-fire salvage logging in montane ash forests. The forests therefore undergo a double set of disturbances--wildfires followed by logging.

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Salvage logging is common after major disturbances such as the 2009 wildfires, and aims to recover some of the economic value of fire-damaged trees. …

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After the Fire: Leadbeater's Long Journey: Life Is Slowly Returning to the Wet Mountain Ash Forests Burned in Victoria's 2009 Black Saturday Fires. Yet, the Future of These Forest Communities-Symbolised by the Iconic Leadbeater's Possum-Is by No Means Guaranteed, Warns a Group of Ecologists in Their Compelling New Book, Forest Phoenix
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