Gagne1997

Référence

Gagne, N. (1997) Comparison of the effects on small mammals of regeneration methods in the boreal balsam fir forest. Thèse de doctorat, Universite Laval (Canada).

Résumé

In an attempt to develop silvicultural practices that are closer to nature, careful logging that protects advance regeneration has been retained as the forest management strategy in Quebec's humid boreal balsam fir forests. The objective of this study was to compare the abundance of small mammals, ecological indicators of habitat disturbance, between naturally regenerated stands after careful logging and plantations. In addition, small mammal abundance on naturally regenerated and spruce budworm (Choristoneura fumiferana)-disturbed stands were compared to determine if those disturbance types are ecologically similar. In order to determine if common post-planting treatments affect habitat quality, small mammal abundance in: naturally regenerated stands; scarified plantations; and plantations after conifer release (herbicide (Vision$\sp\circler$); motor-manual (brush saw)) was assessed. Red-backed vole (Clethrionomys gapperi) abundance in budworm-disturbed stands was twelve times larger than that in logged stands. This difference may be due to the greater abundance of ground woody debris and epigeous fungi in budworm-disturbed stands. Preservation of moss cover, lower shrub layer, and the presence of woody debris in scarified plantations could explain the similar abundances of small mammals between these sites and naturally regenerated stands. In plantations, additional disturbances caused by herbicide release, and associated cover reductions, resulted in a decrease of red-backed voles $(p=0.043),$ two growing seasons post-treatment. In boreal balsam fir forests, careful logging, as presently used, does not appear to produce habitat conditions equivalent to those of budworm-disturbed stands. At the early successional stage, planting and natural regeneration are comparable methods of regeneration in regards to small mammal abundance. However, in the short term, herbicide treated plantations may be habitats of lower quality for red-backed voles than motor-manually treated plantations. Planting in the boreal balsam fir forests did not appear to exceed the tolerance of small mammals mainly because of the prevalence of natural regeneration in plantations.

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@PHDTHESIS { Gagne1997,
    AUTHOR = { Gagne, N. },
    TITLE = { Comparison of the effects on small mammals of regeneration methods in the boreal balsam fir forest },
    SCHOOL = { Universite Laval (Canada) },
    YEAR = { 1997 },
    TYPE = { Ph.D. },
    NOTE = { CEFTMS, Belanger, L. and Bovet, J., Canada },
    ABSTRACT = { In an attempt to develop silvicultural practices that are closer to nature, careful logging that protects advance regeneration has been retained as the forest management strategy in Quebec's humid boreal balsam fir forests. The objective of this study was to compare the abundance of small mammals, ecological indicators of habitat disturbance, between naturally regenerated stands after careful logging and plantations. In addition, small mammal abundance on naturally regenerated and spruce budworm (Choristoneura fumiferana)-disturbed stands were compared to determine if those disturbance types are ecologically similar. In order to determine if common post-planting treatments affect habitat quality, small mammal abundance in: naturally regenerated stands; scarified plantations; and plantations after conifer release (herbicide (Vision$\sp\circler$); motor-manual (brush saw)) was assessed. Red-backed vole (Clethrionomys gapperi) abundance in budworm-disturbed stands was twelve times larger than that in logged stands. This difference may be due to the greater abundance of ground woody debris and epigeous fungi in budworm-disturbed stands. Preservation of moss cover, lower shrub layer, and the presence of woody debris in scarified plantations could explain the similar abundances of small mammals between these sites and naturally regenerated stands. In plantations, additional disturbances caused by herbicide release, and associated cover reductions, resulted in a decrease of red-backed voles $(p=0.043),$ two growing seasons post-treatment. In boreal balsam fir forests, careful logging, as presently used, does not appear to produce habitat conditions equivalent to those of budworm-disturbed stands. At the early successional stage, planting and natural regeneration are comparable methods of regeneration in regards to small mammal abundance. However, in the short term, herbicide treated plantations may be habitats of lower quality for red-backed voles than motor-manually treated plantations. Planting in the boreal balsam fir forests did not appear to exceed the tolerance of small mammals mainly because of the prevalence of natural regeneration in plantations. },
    KEYWORDS = { Forestry Ecology },
    OWNER = { brugerolles },
    TIMESTAMP = { 2008.01.07 },
}

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