Download ppt - Prescribed Burning near SMEAR II spring / early summer 2009 Prescribed burning Burning plan Pre-measurements Measurements during the burning

Prescribed Burning Prescribed Burning near SMEAR II spring / near SMEAR II spring /

early summer 2009early summer 2009

Prescribed burningPrescribed burningBurning planBurning planPre-measurementsPre-measurementsMeasurements during the burningMeasurements during the burningPost-fire measurementsPost-fire measurements

Janne Levula, SMEAR II, Division of the Atmospheric Sciences

Prescribed Burning Prescribed Burning

After the clear-cut of spruce dominated forestAfter the clear-cut of spruce dominated forestMerchantable stem wood is harvested and Merchantable stem wood is harvested and taken awaytaken awaySlash (needles, branches and crown tops) is Slash (needles, branches and crown tops) is left on the siteleft on the siteIn addition to the slash, also the surface In addition to the slash, also the surface vegetation, litter-layer and uppermost part of vegetation, litter-layer and uppermost part of the humus-layer burnsthe humus-layer burns



In Finland there is very seldom such In Finland there is very seldom such conditions that living tree crowns burn during conditions that living tree crowns burn during the forest fire – crowns are moist, and there is the forest fire – crowns are moist, and there is not enough fire-load in the groundnot enough fire-load in the groundThe amount of burnt biomass is greater in the The amount of burnt biomass is greater in the prescribed burning than in the forest fireprescribed burning than in the forest fire



Dry conditions needed – there must be forest-Dry conditions needed – there must be forest-fire warning in forcefire warning in forceWind less than 3-4m secondWind less than 3-4m secondSoutherly wind to direct burning gases to the Southerly wind to direct burning gases to the SMEAR IISMEAR IISlowly proceeding ignition starting under the Slowly proceeding ignition starting under the wind to both directionswind to both directions



Wind direction

Starting point





See the mapSee the map11th May to 17th June, 2009 11th May to 17th June, 2009 Burning itself takes only one afternoonBurning itself takes only one afternoonMore information:More information: http://wiki.helsinki.fi/display/SMEAR/Prescribed+Burninghttp://wiki.helsinki.fi/display/SMEAR/Prescribed+Burning


Burning plan Burning plan

Pre measurements Pre measurements

All the measurements at the SMEAR IIAll the measurements at the SMEAR IIBiomass: trees, surface vegetationBiomass: trees, surface vegetationMass of the litter-layer and humus-layerMass of the litter-layer and humus-layerGreenhouse-gas fluxes from the soilGreenhouse-gas fluxes from the soilProperties of the humusProperties of the humusSoil moisture and temperatureSoil moisture and temperatureAerosol signal strength from the similar Aerosol signal strength from the similar burning with portable CPCs in the early burning with portable CPCs in the early summer 2008summer 2008


Measurements during Measurements during the burning the burning

All the measurements at the SMEAR IIAll the measurements at the SMEAR IIAerosol measurements from the airplane, and Aerosol measurements from the airplane, and possibly also from the ultra-light planepossibly also from the ultra-light planeAerosol measurements with movable Aerosol measurements with movable equipment from the ground levelequipment from the ground levelSurface temperaturesSurface temperaturesFire intensity Fire intensity ??????


Post-fire Post-fire measurementsmeasurements

All the measurements at the SMEAR IIAll the measurements at the SMEAR IIMass of the litter-layer and humus-layerMass of the litter-layer and humus-layerGreenhouse-gas fluxes from the soilGreenhouse-gas fluxes from the soilProperties of the humusProperties of the humusSoil moisture and temperatureSoil moisture and temperature
