HarperBergeronDrapeauEtAl2005

Référence

Harper, K.A., Bergeron, Y., Drapeau, P., Gauthier, S., De Grandpre, L. (2005) Structural development following fire in black spruce boreal forest. Forest Ecology and Management, 206(1-3):293-306.

Résumé

We investigated stand development along a chronosequence on organic,clay and sand sites in black spruce boreal forest in northwesternQuebec, Canada. Our objectives were: (1) to describe trends andstages of structural development following fire; (2) to comparetrends and stages of development both in isolation from and in conjunctionwith species replacement. We tested the hypothesis that althoughtrends in structural development are similar among site types, productivityand composition affect the timing of developmental stages. Dataon live trees, snags and logs were collected at 91 sites. Trendswith time since fire were analyzed using segmented piecewise linearregression. On organic sites, tree basal area and density increasedcontinuously with time since fire, while deadwood abundance decreasedand then increased. Live tree basal area, tree density and deadwoodabundance generally followed expected S-, N- and U-shaped trends,respectively, on clay sites, but often with decreases in later stagesdue to paludification. Fewer trends were significant on sand sites,although tree basal area decreased likely due to a change in speciescomposition. Older forests on all site types were more structurallydiverse. To estimate the timing of the stages of structural development,we introduce a new analysis technique which uses the breakpointsof the piecewise regressions. On organic sites, only three stagesof stand development were evident, whereas a four-stage stand developmentmodel was appropriate for both clay and sand sites. We found thatlocal conditions affected not only the timing of developmental stages,but also the number of stages and the trends themselves. We attributedthese differences to changes in species composition and productivity.We refine the theory of structural development by representing patternsin both live and deadwood as two-stage trends with two possibleoutcomes for each stage. Our new method of determining the timingof the developmental stages using empirical data can be used todevelop management practices that emulate structural developmentin order to conserve biodiversity on a landscape scale. © 2004 ElsevierB.V. All rights reserved.

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@ARTICLE { HarperBergeronDrapeauEtAl2005,
    AUTHOR = { Harper, K.A. and Bergeron, Y. and Drapeau, P. and Gauthier, S. andDe Grandpre, L. },
    TITLE = { Structural development following fire in black spruce boreal forest },
    JOURNAL = { Forest Ecology and Management },
    YEAR = { 2005 },
    VOLUME = { 206 },
    PAGES = { 293-306 },
    NUMBER = { 1-3 },
    ABSTRACT = { We investigated stand development along a chronosequence on organic,clay and sand sites in black spruce boreal forest in northwesternQuebec, Canada. Our objectives were: (1) to describe trends andstages of structural development following fire; (2) to comparetrends and stages of development both in isolation from and in conjunctionwith species replacement. We tested the hypothesis that althoughtrends in structural development are similar among site types, productivityand composition affect the timing of developmental stages. Dataon live trees, snags and logs were collected at 91 sites. Trendswith time since fire were analyzed using segmented piecewise linearregression. On organic sites, tree basal area and density increasedcontinuously with time since fire, while deadwood abundance decreasedand then increased. Live tree basal area, tree density and deadwoodabundance generally followed expected S-, N- and U-shaped trends,respectively, on clay sites, but often with decreases in later stagesdue to paludification. Fewer trends were significant on sand sites,although tree basal area decreased likely due to a change in speciescomposition. Older forests on all site types were more structurallydiverse. To estimate the timing of the stages of structural development,we introduce a new analysis technique which uses the breakpointsof the piecewise regressions. On organic sites, only three stagesof stand development were evident, whereas a four-stage stand developmentmodel was appropriate for both clay and sand sites. We found thatlocal conditions affected not only the timing of developmental stages,but also the number of stages and the trends themselves. We attributedthese differences to changes in species composition and productivity.We refine the theory of structural development by representing patternsin both live and deadwood as two-stage trends with two possibleoutcomes for each stage. Our new method of determining the timingof the developmental stages using empirical data can be used todevelop management practices that emulate structural developmentin order to conserve biodiversity on a landscape scale. © 2004 ElsevierB.V. All rights reserved. },
    KEYWORDS = { Boreal forest Chronosequence Coarse woody material Forest structureOld growth Piecewise linear regression Structural development ClayEcology Fire hazards Regression analysis Sand Black spruce borealforests Linear regression Structural development Forestry borealforest chronosequence developmental stage forest fire stand structureClay Ecology Forestry Sand Canada North America Quebec [Canada]Western Hemisphere World Picea Picea mariana },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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