CarcailletBergeronRichardEtAl2001

Référence

Carcaillet, C., Bergeron, Y., Richard, P.J.H., Frechette, B., Gauthier, S., Prairie, Y.T. (2001) Change of fire frequency in the eastern Canadian boreal forests duringthe Holocene: Does vegetation composition or climate trigger thefire regime? Journal of Ecology, 89(6):930-946.

Résumé

1. Studies on the variability of natural fire regimes are needed tounderstand plant responses in a changing environment. Since vegetationchanges might follow or trigger changes in fire frequency, climatemodels suggest that changes in water balance will accompany currentglobal warming, and the response of fire regimes to Holocene hydro-climatechanges and vegetation switches may thus serve as a useful analoguefor current change. 2. We present high-resolution charcoal recordsfrom laminated cores from three small kettle lakes located in mixed-borealand coniferous-boreal forest. Comparison with some pollen diagramsfrom the lakes is used to evaluate the role of the local vegetationin the fire history. Fire frequency was reconstructed by measuringthe separation of peaks after detrending the charcoal accumulationrate from any background. 3. Several distinct periods of fire regimewere detected with fire intervals. Between c. 7000-3000 cal. yearBP, fire intervals were double those in the last 2000 years. Firefrequency changed 1000 years earlier in the coniferous-boreal forestthan in the mixed-boreal forest to the south. The absence of changesin combustibility species in the pollen data that could explainthe fire frequency transition suggests that the vegetation doesnot control the long-term fire regime in the boreal forest. 4. Climateappears to be the main process triggering fire. The increased frequencymay be the result of more frequent drought due to the increasinginfluence of cool dry westerly Pacific air-masses from mid to lateHolocene, and thus of conditions conducive to ignition and firespread. In east Canada, this change matches other long-term climateproxies and suggests that a switch in atmospheric circulation 2-3000years ago triggered a less stable climate with more dry summers.Future warming is moreover likely to reduce fire frequency.

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@ARTICLE { CarcailletBergeronRichardEtAl2001,
    AUTHOR = { Carcaillet, C. and Bergeron, Y. and Richard, P.J.H. and Frechette,B. and Gauthier, S. and Prairie, Y.T. },
    TITLE = { Change of fire frequency in the eastern Canadian boreal forests duringthe Holocene: Does vegetation composition or climate trigger thefire regime? },
    JOURNAL = { Journal of Ecology },
    YEAR = { 2001 },
    VOLUME = { 89 },
    PAGES = { 930-946 },
    NUMBER = { 6 },
    ABSTRACT = { 1. Studies on the variability of natural fire regimes are needed tounderstand plant responses in a changing environment. Since vegetationchanges might follow or trigger changes in fire frequency, climatemodels suggest that changes in water balance will accompany currentglobal warming, and the response of fire regimes to Holocene hydro-climatechanges and vegetation switches may thus serve as a useful analoguefor current change. 2. We present high-resolution charcoal recordsfrom laminated cores from three small kettle lakes located in mixed-borealand coniferous-boreal forest. Comparison with some pollen diagramsfrom the lakes is used to evaluate the role of the local vegetationin the fire history. Fire frequency was reconstructed by measuringthe separation of peaks after detrending the charcoal accumulationrate from any background. 3. Several distinct periods of fire regimewere detected with fire intervals. Between c. 7000-3000 cal. yearBP, fire intervals were double those in the last 2000 years. Firefrequency changed 1000 years earlier in the coniferous-boreal forestthan in the mixed-boreal forest to the south. The absence of changesin combustibility species in the pollen data that could explainthe fire frequency transition suggests that the vegetation doesnot control the long-term fire regime in the boreal forest. 4. Climateappears to be the main process triggering fire. The increased frequencymay be the result of more frequent drought due to the increasinginfluence of cool dry westerly Pacific air-masses from mid to lateHolocene, and thus of conditions conducive to ignition and firespread. In east Canada, this change matches other long-term climateproxies and suggests that a switch in atmospheric circulation 2-3000years ago triggered a less stable climate with more dry summers.Future warming is moreover likely to reduce fire frequency. },
    KEYWORDS = { Boreal forest Charcoal Climate Fire frequency Holocene Laminated sedimentsPollen Quebec charcoal boreal forest climate community compositionfire Holocene Canada ecosystem fire history fire ecology pollentaiga Canada },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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