在几十年的防火措施之后重新引入大规模的计划消防.pdf

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1、Re-introducing broadscale planned fire following several decades of fire exclusionPresented by Dr Lachlan McCaw AFSM,RFPForestry Australia Fire Summit 26&27 June 2024Prescribed fire:Exploring science,culture and practiceSession#4:Achieving land management goals using prescribed fireOverview Context

2、for fire management in WA southern forests 1964 to 2024 Iffley forest block case study-harvest®eneration-fire excluded while regenerated forest develops-when&how to re-introduce planned fire?Operational factors-complexity of fuel types&drying rates-burn security-monitoring outcomes Learnings appl

3、icable to other situations-mining landscapes-following major bushfiresIffley forest block,south-western Australia-34.25S 115.80ETall open forest Euc.diversicolor(karri)Open forest of Euc.marginata(jarrah)&Corymbiacalophylla(marri)Changes in forest management 1964 to 1974Prescribed fire larger burns

4、with aerial ignitionTimber harvest return to even-aged management19641974PrescribedburningEven-agedregenerationIffley forest block 2014 increased complexity!Fuel type,structure and drying ratesTenure&management objectives(national park,old-growth)Regeneratedjarrah/marriRegenerated karriThinnedNot-th

5、innedIffley block prescribed burn Nov 2015 First ignition 11 Nov 2015 Last ignition 2 Dec 2015 Boundary ignitions(edging)4 days Core ignitions(aircraft)4 days No serious breaches of boundary Unplanned fires at Esperance and Perth in mid-November diverted resources away from prescribed burningOperati

6、onal factors critical to success Understand fuel type and structure potential fire behaviour Identify&prepare a secure perimeter for the burn Develop an ignition plan flexible to cope with uncertainty in drying rates and weather outlooks Monitor fuel drying rates-seasonal(Soil Dr