PlamondonMarquisPrevostEtAl2006

Référence

Plamondon, A.P., Marquis, F., Prévost, M., Lévesque, D. and Seto, M. (2006) Managing the cumulative effects of forest disturbance on peak flow and water quality. In Workshop on the conservation and sustainable management of boreal forests: A Canadian-Russian perspective. St-Petersbourg, Russia.

Résumé

It is recognized that the morphology of stream channels are shaped by bankfull discharged which has a return period of about 1.5 years for alluvial streams or more in steep streams. By setting the allowable peak flow (return period  1.5 years) increase at 50 % the corresponding acceptable equivalent clearcut area was found to be 50 % of the watershed area. The rate of recovery was established by the relative snowmelt and transpiration measured in stands at various development stages from clearcut to maturity. Full recovery was reached within 35 years in the balsam fir boreal forest. The method is applied to Quebec’s salmon watersheds larger than 100 km2. For water quality, the ecological threshold for the allowable changes of the combination of physico-chemical parameters is not established yet. However, the recovery rates are established for K, Fe and Mn while the concentrations of NO3, Ca, Mg and pH are almost back to normal, 10 years after harvesting 85 % of a 122 ha watershed. The concentrations of N remain higher than their pre-harvesting levels but the monitoring is continuing. In terms of the geochemical budget the additional growing season losses due to harvesting represent only 2 to 3 years of natural losses for Ca, Mg and K, and 14 years for N. Considering the present knowledge, it would be justifiable to limit the equivalent clearcut area around 50 % of the watershed area feeding high fishing streams.

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@INPROCEEDINGS { PlamondonMarquisPrevostEtAl2006,
    AUTHOR = { Plamondon, A.P. and Marquis, F. and Prévost, M. and Lévesque, D. and Seto, M. },
    TITLE = { Managing the cumulative effects of forest disturbance on peak flow and water quality. },
    BOOKTITLE = { Workshop on the conservation and sustainable management of boreal forests: A Canadian-Russian perspective },
    YEAR = { 2006 },
    ADDRESS = { St-Petersbourg, Russia. },
    ABSTRACT = { It is recognized that the morphology of stream channels are shaped by bankfull discharged which has a return period of about 1.5 years for alluvial streams or more in steep streams. By setting the allowable peak flow (return period  1.5 years) increase at 50 % the corresponding acceptable equivalent clearcut area was found to be 50 % of the watershed area. The rate of recovery was established by the relative snowmelt and transpiration measured in stands at various development stages from clearcut to maturity. Full recovery was reached within 35 years in the balsam fir boreal forest. The method is applied to Quebec’s salmon watersheds larger than 100 km2. For water quality, the ecological threshold for the allowable changes of the combination of physico-chemical parameters is not established yet. However, the recovery rates are established for K, Fe and Mn while the concentrations of NO3, Ca, Mg and pH are almost back to normal, 10 years after harvesting 85 % of a 122 ha watershed. The concentrations of N remain higher than their pre-harvesting levels but the monitoring is continuing. In terms of the geochemical budget the additional growing season losses due to harvesting represent only 2 to 3 years of natural losses for Ca, Mg and K, and 14 years for N. Considering the present knowledge, it would be justifiable to limit the equivalent clearcut area around 50 % of the watershed area feeding high fishing streams. },
}

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