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Sustainable yield is the maximum volume of timber available for felling each year. The figures are revised every five years, and are supposed to ensure that logging is sustainable indefinitely. The auditing system would match the estimated volumes for individual logging blocks, or coupes, with the actual amounts felled, and would test the accuracy of computer modelling by the Department of Natural Resources and Environment.
The inquiry is the third in recent history to draw attention to inadequate state forestry records. The auditor-general in 1993 and an independent consultant to the Government in 1995 called for similar auditing systems.
A spokeswoman for the Environment and Conservation Minister, Ms Sherryl Garbutt, said there was a need for public confidence in departmental figures, and the Government would consider how to achieve this. The credibility of the Government's timber estimates is crucial as the state and Commonwealth prepare to sign next week regional forest agreements that allow unlimited woodchip exports for 20 years.
The proposed forest agreements released in January revealed that the amount of high-grade sawlog timber growing in the forests of west Victoria and Gippsland was vastly overestimated. The Wombat Forest Society's analysis was based on field observations and limited data released by the department. It concluded that the forest would be exhausted for commercial use within 15 years, putting more than 200 jobs at risk.
The society's Mr Tim Anderson said the department's computer modelling for timber volumes relied on inaccurate information about actual regrowth and logging rates. Mr Anderson claimed satellite imaging was in conflict with the areas the department claimed were logged, and it was "staggering" that the department was unable to produce complete maps of the area's logging history.
Mr Anderson's analysis was followed by similar exercises for the Tambo
and Wodonga forest management areas by Ms Loris Duclos of the Tambo Environment
Awareness Group. Ms Duclos found continued logging in Wodonga may
be illegal because 15 years' worth of timber had been cut in just one decade,
and that the Tambo industry faces an impoverished future in lowgrade forests
because the most commercially valuable areas had been cut out.
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