DupontBelangerBousquet1991

Référence

Dupont, A., Belanger, L., Bousquet, J. (1991) Relationships between balsam-fir vulnerability to spruce budworm and ecological site conditions of fir stands in central Québec. Canadian Journal of Forest Research, 21(12):1752-1759.

Résumé

A clear relationship (P < 0.05) was found between ecological site conditions of fir stands approaching maturity and mortality of balsam fir (Abies balsamea (L.) Mill.) caused by the last spruce budworm (Choristoneura fumiferana (Clem.)) outbreak. This relationship was observed in three ecoclimatic regions in central Quebec. Generally, in areas moderately affected by the outbreak, three levels of mortality could be identified following four moisture regime classes: xeric fir stands (xBAR = 85% mortality) and hydric fir stands (xBAR = 75% mortality) were the most vulnerable, mesic fir stands showed an intermediate level of mortality (xBAR = 45% mortality), while subhygric fir stands with seepage were constantly less vulnerable (xBAR = 27% mortality). This general pattern of mortality was observed in the three ecoregions surveyed, in spite of important regional differences (climate, intensity of the outbreak, stand composition) among them. Except for the mesic sites, levels of mortality for the same site type did not vary significantly (P > 0.05) from one ecoregion to another. The effect of moisture gradient on stand vigor and the biological performances of the spruce budworm may explain the results obtained.

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@ARTICLE { DupontBelangerBousquet1991,
    AUTHOR = { Dupont, A. and Belanger, L. and Bousquet, J. },
    TITLE = { Relationships between balsam-fir vulnerability to spruce budworm and ecological site conditions of fir stands in central Québec },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 1991 },
    VOLUME = { 21 },
    PAGES = { 1752-1759 },
    NUMBER = { 12 },
    ABSTRACT = { A clear relationship (P < 0.05) was found between ecological site conditions of fir stands approaching maturity and mortality of balsam fir (Abies balsamea (L.) Mill.) caused by the last spruce budworm (Choristoneura fumiferana (Clem.)) outbreak. This relationship was observed in three ecoclimatic regions in central Quebec. Generally, in areas moderately affected by the outbreak, three levels of mortality could be identified following four moisture regime classes: xeric fir stands (xBAR = 85% mortality) and hydric fir stands (xBAR = 75% mortality) were the most vulnerable, mesic fir stands showed an intermediate level of mortality (xBAR = 45% mortality), while subhygric fir stands with seepage were constantly less vulnerable (xBAR = 27% mortality). This general pattern of mortality was observed in the three ecoregions surveyed, in spite of important regional differences (climate, intensity of the outbreak, stand composition) among them. Except for the mesic sites, levels of mortality for the same site type did not vary significantly (P > 0.05) from one ecoregion to another. The effect of moisture gradient on stand vigor and the biological performances of the spruce budworm may explain the results obtained. },
    KEYWORDS = { MICHIGANS UPPER PENINSULA; WHITE SPRUCE; OUTBREAK; EPIDEMIOLOGY; DEFOLIATION; LEPIDOPTERA; TORTRICIDAE; DRAINAGE; PATTERNS; GROWTH },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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