GrandpreBoucherBergeronEtAl2011

Référence

De Grandpre, L., Boucher, D., Bergeron, Y., Gagnon, D. (2011) Effects of small canopy gaps on boreal mixedwood understory vegetationdynamics. Community Ecology, 12(1):67-77. (URL )

Résumé

Boreal mixedwood understory communities are highly dynamic becausethey are simultaneously influenced by canopy succession, small-scaleenvironmental variation and disturbances. In such a system, fireinitiates succession but canopy gaps, resulting from spruce budwormoutbreaks or other disturbances, also affect forest dynamics duringsuccession. In this study, we assessed the short-term response ofunderstory communities along a canopy gap severity gradient in matureand old-growth forest stands. The objective was to determine if resourceheterogeneity is driving understory community composition and diversity.We created artificial gaps of varying severities in stands of twolate successional forest stages. Four treatments, i.e., total cut,conifer cut, girdling of conifers and a control treatment, were eachapplied over an area of 100 m2 and replicated three times in bothtypes of forest stands. The cover of each understory species wasmeasured before treatment application and 1, 2 and 11 years followingit, in seven 1 m2 plots per replicate. Percent transmission of photosyntheticphoton flux density and soil temperature were also measured on differentoccasions after the beginning of the experiment. Species richness,alpha diversity and total cover all increased following gap creation,and this increase was sustained up to 11 years. Increases were morepronounced in total cut than in other treatments. The increase inspecies richness and diversity was also more pronounced in old-growthstands, while total cover increase was greater in mature stands.Gap creation resulted in significant changes in abundance patternsthat were associated with the resident species assemblages. The magnitudeof changes in community composition did not significantly differbetween mature and old-growth forests and differences in speciescomposition among stands were maintained following gap creation.This study supports the evidence that resource heterogeneity resultingfrom small-scale disturbances will contribute to maintaining diversityamong understory communities by allowing species more typical ofearly-successional communities to coexist with species from late-successionalones. Such a process may be essential for maintaining the speciespool likely to re-invade the stands following major disturbances.

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@ARTICLE { GrandpreBoucherBergeronEtAl2011,
    AUTHOR = { De Grandpre, L. and Boucher, D. and Bergeron, Y. and Gagnon, D. },
    TITLE = { Effects of small canopy gaps on boreal mixedwood understory vegetationdynamics },
    JOURNAL = { Community Ecology },
    YEAR = { 2011 },
    VOLUME = { 12 },
    PAGES = { 67-77 },
    NUMBER = { 1 },
    MONTH = { jun },
    ABSTRACT = { Boreal mixedwood understory communities are highly dynamic becausethey are simultaneously influenced by canopy succession, small-scaleenvironmental variation and disturbances. In such a system, fireinitiates succession but canopy gaps, resulting from spruce budwormoutbreaks or other disturbances, also affect forest dynamics duringsuccession. In this study, we assessed the short-term response ofunderstory communities along a canopy gap severity gradient in matureand old-growth forest stands. The objective was to determine if resourceheterogeneity is driving understory community composition and diversity.We created artificial gaps of varying severities in stands of twolate successional forest stages. Four treatments, i.e., total cut,conifer cut, girdling of conifers and a control treatment, were eachapplied over an area of 100 m2 and replicated three times in bothtypes of forest stands. The cover of each understory species wasmeasured before treatment application and 1, 2 and 11 years followingit, in seven 1 m2 plots per replicate. Percent transmission of photosyntheticphoton flux density and soil temperature were also measured on differentoccasions after the beginning of the experiment. Species richness,alpha diversity and total cover all increased following gap creation,and this increase was sustained up to 11 years. Increases were morepronounced in total cut than in other treatments. The increase inspecies richness and diversity was also more pronounced in old-growthstands, while total cover increase was greater in mature stands.Gap creation resulted in significant changes in abundance patternsthat were associated with the resident species assemblages. The magnitudeof changes in community composition did not significantly differbetween mature and old-growth forests and differences in speciescomposition among stands were maintained following gap creation.This study supports the evidence that resource heterogeneity resultingfrom small-scale disturbances will contribute to maintaining diversityamong understory communities by allowing species more typical ofearly-successional communities to coexist with species from late-successionalones. Such a process may be essential for maintaining the speciespool likely to re-invade the stands following major disturbances. },
    URL = { http://dx.doi.org/10.1556/ComEc.12.2011.1.9 },
}

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