MenardDubeBouchardEtAl2002a

Référence

Menard, A., Dube, P., Bouchard, A., Marceau, D.J. (2002) Release episodes at the periphery of gaps: A modeling assessment of gap impact extent. Canadian Journal of Forest Research, 32(9):1651-1661.

Résumé

Gaps are recognized as important features of temperate forest dynamics and have been extensively studied in the last decades. Their definition has progressively evolved from the simplistic physical projection of the canopy opening to a more resource-based and functional approach (extended and species extended gaps). However, to truly define gap extent, the peripheral impact of gaps on the trees has to be considered. This study was undertaken to characterize the impact extent of gaps on their periphery using the SORTIE forest succession model. The sapling growth responses to gaps of different sizes (500-2000 m2) was used as an indicator of the impact extent. Ten replicates of a simulation (for each gap size) were performed (305 years, 25-ha lattice). Gaps were introduced after 300 years. Growth ratios (pregap/postgap growth) for each sapling were computed and compared with a release threshold to determine sapling release episodes. These release episodes were analyzed to assess the extent of gap impact. Results indicate that gap effect extends significantly into the adjacent forest. Release episode orientations are concentrated in the northern hemisphere of gaps, and release episodes mostly appear in the first 20 m from gaps. Based on different degrees of release occurrence, new gap areas were defined and compared with areas from existing gap definitions. The differences are substantial and reveal that gap spatial extent observed through release patterns surpasses gap areas defined by traditional definitions.

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@ARTICLE { MenardDubeBouchardEtAl2002a,
    AUTHOR = { Menard, A. and Dube, P. and Bouchard, A. and Marceau, D.J. },
    TITLE = { Release episodes at the periphery of gaps: A modeling assessment of gap impact extent },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 2002 },
    VOLUME = { 32 },
    PAGES = { 1651-1661 },
    NUMBER = { 9 },
    NOTE = { 00455067 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus CODEN: CJFRA doi: 10.1139/x02-090 Language of Original Document: English Correspondence Address: Marceau, D.J.; Geocomputing Laboratory; Department of Geography; Universite? de Montre?al; succursale Centre-Ville Montre?al, Que. H3C 3J7, Canada; email: danielle.marceau@umontreal.ca References: Barden, L.S., Repeatability in forest gap research: Studies in the Great Smoky Mountains (1989) Ecology, 70, pp. 558-559; Bazzaz, F.A., Pickett, S.T.A., Physiological ecology of tropical succession: A comparative review (1980) Annu. Rev. Ecol. Syst., 11, pp. 287-310; Bormann, F.H., Likens, G.E., (1979) Pattern and Process in a Forested Ecosystem, , Springer-Verlag, New York; Botkin, D.B., Janak, J.F., Wallis, J.R., Some ecological consequences of a computer model of forest growth (1972) J. 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    ABSTRACT = { Gaps are recognized as important features of temperate forest dynamics and have been extensively studied in the last decades. Their definition has progressively evolved from the simplistic physical projection of the canopy opening to a more resource-based and functional approach (extended and species extended gaps). However, to truly define gap extent, the peripheral impact of gaps on the trees has to be considered. This study was undertaken to characterize the impact extent of gaps on their periphery using the SORTIE forest succession model. The sapling growth responses to gaps of different sizes (500-2000 m2) was used as an indicator of the impact extent. Ten replicates of a simulation (for each gap size) were performed (305 years, 25-ha lattice). Gaps were introduced after 300 years. Growth ratios (pregap/postgap growth) for each sapling were computed and compared with a release threshold to determine sapling release episodes. These release episodes were analyzed to assess the extent of gap impact. Results indicate that gap effect extends significantly into the adjacent forest. Release episode orientations are concentrated in the northern hemisphere of gaps, and release episodes mostly appear in the first 20 m from gaps. Based on different degrees of release occurrence, new gap areas were defined and compared with areas from existing gap definitions. The differences are substantial and reveal that gap spatial extent observed through release patterns surpasses gap areas defined by traditional definitions. },
    KEYWORDS = { Computer simulation Growth kinetics Impact testing Gap extent Forestry canopy gap ecological modeling forest dynamics forest ecosystem },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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