PareBergeron1996

Référence

Pare, D. and Bergeron, Y. (1996) Effect of colonizing tree species on soil nutrient availability ina clay soil of the boreal mixedwood. Canadian Journal of Forest Research, 26(6):1022-1031.

Résumé

Soil nutrient availability wits assessed around stems of tremblingaspen (Populus tremuloides Michx.)I, white spruce (Picea glauca(Moench) Voss), and paper birch (Betula papyrifera Marsh.) thatregenerated after fire 49, 77, and 123 years ago on a clayey, soilof thc southern boreal forest. For all stand age, forest floor pHwas greater by 0.5 unit under aspen than tinder under species, whilethe accumulation of organiC matter and nutrients was generally greaterin the forest floor of spruce. With time sinice fire, forest floorpH and mineral soil reserves of nitrogen (N) and exchangeable calciumdeclined significantly, while the C/N ratio increased, perhaps asa result of nutrient immobilization in the aggrading biomass. NetN mineralization and nitrification, measured by aerobic laboratoryincubations, were higher under birch and aspen than under sprucein the forest floor and the mineral soil of the youngest stand (49years old). However, in older stands, these parameters were significantlylower, and no significant differences were found between soils ofdeciduous and coniferous species. These results suggest that a decreasein N availability with time since fire was caused by factors otherthan the generally assumed succession to coniferous trees.

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@ARTICLE { PareBergeron1996,
    AUTHOR = { Pare, D. and Bergeron, Y. },
    TITLE = { Effect of colonizing tree species on soil nutrient availability ina clay soil of the boreal mixedwood },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 1996 },
    VOLUME = { 26 },
    PAGES = { 1022-1031 },
    NUMBER = { 6 },
    ABSTRACT = { Soil nutrient availability wits assessed around stems of tremblingaspen (Populus tremuloides Michx.)I, white spruce (Picea glauca(Moench) Voss), and paper birch (Betula papyrifera Marsh.) thatregenerated after fire 49, 77, and 123 years ago on a clayey, soilof thc southern boreal forest. For all stand age, forest floor pHwas greater by 0.5 unit under aspen than tinder under species, whilethe accumulation of organiC matter and nutrients was generally greaterin the forest floor of spruce. With time sinice fire, forest floorpH and mineral soil reserves of nitrogen (N) and exchangeable calciumdeclined significantly, while the C/N ratio increased, perhaps asa result of nutrient immobilization in the aggrading biomass. NetN mineralization and nitrification, measured by aerobic laboratoryincubations, were higher under birch and aspen than under sprucein the forest floor and the mineral soil of the youngest stand (49years old). However, in older stands, these parameters were significantlylower, and no significant differences were found between soils ofdeciduous and coniferous species. These results suggest that a decreasein N availability with time since fire was caused by factors otherthan the generally assumed succession to coniferous trees. },
    KEYWORDS = { boreal forest fire forestry nitrogen soil nutrient tree Canada, Quebec },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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