BoudreaultBergeronGauthierEtAl2002

Référence

Boudreault, C., Bergeron, Y., Gauthier, S. and Drapeau, P. (2002) Bryophyte and lichen communities in mature to old-growth stands ineastern boreal forests of Canada. Canadian Journal of Forest Research, 32(6):1080-1093.

Résumé

We sampled 22 black spruce (Picea mariana) - feathermoss (Pleuroziumschreberi) sites (80 to >200 years) to describe and assess the diversityof bryophyte and lichen communities as a function of time sincefire and site characteristics. Old growth had no more species thanyounger forests. We think that this result might be explained bythe phenomenon of paludification, which is a major process in thisregion. Axis 1 of a nonmetric multidimensional scaling ordination(NMS) of terricolous species was interpreted as a paludificationgradient. Mature forests were characterized by Pleurozium schreberi,Ptilium crista-castrensis, Polytrichum commune, and Dicranum polysetum,and older sites by a greater abundance of Sphagnum. Axis 1 of epiphyticspecies ordination (NMS) was interpreted as a gradient of time sincethe last fire. Abundance of Tuckermannopsis americana, Hypogymniaphysodes, and Bryoria furcellata was greater in mature forests.In contrast, Mycoblastus sanguinarius, Bryoria trichodes, and Usneaspp. were more abundant in older forests. The abundance of epiphyticlichens increased with tree age, whereas their richness was higherin sites where trembling aspen (Populus tremuloides) and jack pine(Pinus banksiana) were present. Since species composition variedwith time since the last fire, it is important to preserve the diversityof successional stages at the landscape level and the structuraldiversity at the stand level to maintain the bryophyte and lichencommunities.

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@ARTICLE { BoudreaultBergeronGauthierEtAl2002,
    AUTHOR = { Boudreault, C. and Bergeron, Y. and Gauthier, S. and Drapeau, P. },
    TITLE = { Bryophyte and lichen communities in mature to old-growth stands ineastern boreal forests of Canada },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 2002 },
    VOLUME = { 32 },
    PAGES = { 1080-1093 },
    NUMBER = { 6 },
    ABSTRACT = { We sampled 22 black spruce (Picea mariana) - feathermoss (Pleuroziumschreberi) sites (80 to >200 years) to describe and assess the diversityof bryophyte and lichen communities as a function of time sincefire and site characteristics. Old growth had no more species thanyounger forests. We think that this result might be explained bythe phenomenon of paludification, which is a major process in thisregion. Axis 1 of a nonmetric multidimensional scaling ordination(NMS) of terricolous species was interpreted as a paludificationgradient. Mature forests were characterized by Pleurozium schreberi,Ptilium crista-castrensis, Polytrichum commune, and Dicranum polysetum,and older sites by a greater abundance of Sphagnum. Axis 1 of epiphyticspecies ordination (NMS) was interpreted as a gradient of time sincethe last fire. Abundance of Tuckermannopsis americana, Hypogymniaphysodes, and Bryoria furcellata was greater in mature forests.In contrast, Mycoblastus sanguinarius, Bryoria trichodes, and Usneaspp. were more abundant in older forests. The abundance of epiphyticlichens increased with tree age, whereas their richness was higherin sites where trembling aspen (Populus tremuloides) and jack pine(Pinus banksiana) were present. Since species composition variedwith time since the last fire, it is important to preserve the diversityof successional stages at the landscape level and the structuraldiversity at the stand level to maintain the bryophyte and lichencommunities. },
    KEYWORDS = { Biodiversity Ecosystems Fires Landscape levels Forestry boreal forestbryophyte community composition lichen old-growth forest water tableCanada Bryophyta bryophytes Bryoria Bryoria furcellata Bryoria trichodesDicranum Dicranum polysetum Hypogymnia Hypogymnia physodes Mycoblastussanguinarius Paragnetina Picea Picea mariana Pinus banksiana Pleuroziumschreberi Polytrichum Polytrichum commune Populus Populus tremuloidesPteridophyta Ptilium crista-castrensis Sphagnum Trichodes TuckermannopsisTuckermannopsis americana Usnea },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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