計劃焚燒以實現降低風險和生物多樣性成果.pdf

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1、Prescribed burning to achieve risk reduction and biodiversity outcomesDr Jane CawsonFLARE Wildfire ResearchSchool of Agriculture,Food and Ecosystem Sciences2AcknowledgementsOur research was conducted on the traditional lands of the Gunditjmara peoples from far south-western Victoria Many thanks to:R

2、esearch team from the University of Melbourne Bee Pickering,Trent Penman,Erica Marshall,Kate Parkins,Shona Elliot-Kerr DEECA project team Hamish Martin,Nicola Aylward,Mel Calwell Workshop participants DEECA,Parks Victoria,CFA,Gundtij mirring,Glenelg Hopkins CMA,University of Melbourne,Nature Glenelg

3、,Glenelg shire council3Climate change is altering fire riskPhoto credit:John Costenaro 4We are in a biodiversity crisis5How do we want our forests to look in the future?What management actions could be used to shift vegetation towards a desirable state?Do we need objective-specific burn prescription

4、s?6Far south-western VictoriaSoutheastern red tailed black cockatooHeath Mouse7Expert elicitation:Structured decision making&Quantitative Expert Judgement8Expert elicitation:Structured decision making&Quantitative Expert Judgement Lack of existing data but plenty of experiential knowledge Considers

5、a broad range of perspectives,which may help with social license Different perspectives promote creative thinking Group estimates outperform individual estimates Structured approach allows estimates to be treated as data9How do we want our forests to look in the future?DesirableUndesirable123451011V

6、egetation attributes desirable or undesirable from both perspectives Lower stem density High live to dead ratio x Abundant woody weedsx Extensive diebackVegetation attributes desirable from one perspective and unimportant to the other Charred barkHigh floristic diversityMulti-cohort of treesHollow b

7、earing treesVegetation attributes could be compatible Sparser vegetation closer to human assetsMixed density vegetation across the wider landscapeCompatibility between objectives12What management actions could shift vegetation towards a desirable state?Burning:high severity,high coverageBurning:mixe

8、d-severity,patchingBurning:candlingGrazingRevegetationSlashingArtificial habitat creationHand removalHerbicideMonitoringMulchingPredator controlThinning13Management pathways14What management actions are needed to transition vegetation to a desirable state?Proportion of management pathways15Prescribe

9、d burning Broadscale management tool Different severities&patchiness needed to achieve specific objectives Do we need objective-specific burn prescriptions?Fire behaviour rate of spread,flame height,fire intensityFire danger index(Index integrating other fire weather variables)Air temperatureRelativ

10、e humidityWind speedDead fine fuel moisture Surface and near surface fuelSoil moistureKeetch Byram Drought IndexBurn outcomepatchiness,coverage,fire severityTerrainslope,aspectFuel structurefuel hazardDo we need objective-specific burn prescriptions?17FuseeSelf-propelled incendiary flareIncendiaries

11、 from droneSpots with drip torchStrips with drip torchIncendiaries from aircraftVehicle mounted flame throwerAerial drip torchFire behaviour rate of spread,flame height,fire intensityFire danger index(Index integrating other fire weather variables)Air temperatureRelative humidityWind speedDead fine

12、fuel moisture Surface and near surface fuelSoil moistureKeetch Byram Drought IndexBurn outcomepatchiness,coverage,fire severityTerrainslope,aspectFuel structurefuel hazardDo we need objective-specific burn prescriptions?Weather following the burnRisk of escapeFuel surrounding the burn fuel hazard,mo

13、isture,grass curingAmount remaining unburnt within the burn perimeterIgnition technique20In summaryHow do we want our forests to look in the future?Fire risk and biodiversity conservation compatible to a large extentWhich combinations of management actions could be used to achieve these desired fore

14、st states?Fuel management could be tailored to achieve both objectives in many parts of the landscape,particularly if there is an appetite to include additional steps to increase ecosystem resilienceDo we need objective-specific burn prescriptions?Prescriptions differed for patchy vs.high coverage burning But differences in fuel structure could be accommodated by adjusting the lighting technique Objective-specific burn prescriptions may be useful,but will not negate the need for highly experienced burn operatorsThank .au/flarewildfire