HarperBergeronDrapeauEtAl2006

Référence

Harper, K.A., Bergeron, Y., Drapeau, P., Gauthier, S. and De Grandpre, L. (2006) Changes in spatial pattern of trees and snags during structural developmentin Picea mariana boreal forests. Journal of Vegetation Science, 17(5):625-636.

Résumé

Questions: How do gap abundance and the spatial pattern of trees andsnags change throughout stand development in Picea mariana forests?Does spatial pattern differ among site types and structural componentsof a forest? Location: Boreal forests dominated by Picea mariana,northern Quebec and Ontario, Canada. Methods: Data on the abundance,characteristics and spatial location of trees, snags and gaps werecollected along 200 m transects at 91 sites along a chronosequence.Spatial analyses included 3TLQV, NLV and autocorrelation analysis.Non-parametric analyses were used to analyse trends with time anddifferences among structural components and site types. Results:Gaps became more abundant, numerous and more evenly distributedwith time. At distances of 1-4 m, tree cover, sapling density andsnag density became more heterogeneous with time. Tree cover appearedto be more uniform for the 10-33 m interval, although this was notsignificant. Patch size and variance at 1 m were greater for overstoreythan for understorey tree cover. Snags were less spatially variablethan trees at 1 m, but more so at intermediate distances (4-8 m).Few significant differences were found among site types. Conclusions:During stand development in P. mariana forest, gaps formed by treemortality are filled in slowly due to poor regeneration and growth,leading to greater gap abundance and clumping of trees and snagsat fine scales. At broader scales, patchy regeneration is followedby homogenization of forest stands as trees become smaller withlow productivity due to paludification. © IAVS; Opulus Press.

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@ARTICLE { HarperBergeronDrapeauEtAl2006,
    AUTHOR = { Harper, K.A. and Bergeron, Y. and Drapeau, P. and Gauthier, S. andDe Grandpre, L. },
    TITLE = { Changes in spatial pattern of trees and snags during structural developmentin Picea mariana boreal forests },
    JOURNAL = { Journal of Vegetation Science },
    YEAR = { 2006 },
    VOLUME = { 17 },
    PAGES = { 625-636 },
    NUMBER = { 5 },
    ABSTRACT = { Questions: How do gap abundance and the spatial pattern of trees andsnags change throughout stand development in Picea mariana forests?Does spatial pattern differ among site types and structural componentsof a forest? Location: Boreal forests dominated by Picea mariana,northern Quebec and Ontario, Canada. Methods: Data on the abundance,characteristics and spatial location of trees, snags and gaps werecollected along 200 m transects at 91 sites along a chronosequence.Spatial analyses included 3TLQV, NLV and autocorrelation analysis.Non-parametric analyses were used to analyse trends with time anddifferences among structural components and site types. Results:Gaps became more abundant, numerous and more evenly distributedwith time. At distances of 1-4 m, tree cover, sapling density andsnag density became more heterogeneous with time. Tree cover appearedto be more uniform for the 10-33 m interval, although this was notsignificant. Patch size and variance at 1 m were greater for overstoreythan for understorey tree cover. Snags were less spatially variablethan trees at 1 m, but more so at intermediate distances (4-8 m).Few significant differences were found among site types. Conclusions:During stand development in P. mariana forest, gaps formed by treemortality are filled in slowly due to poor regeneration and growth,leading to greater gap abundance and clumping of trees and snagsat fine scales. At broader scales, patchy regeneration is followedby homogenization of forest stands as trees become smaller withlow productivity due to paludification. © IAVS; Opulus Press. },
    KEYWORDS = { Chronosequence Forest stand development Forest structure Gap dynamicsNew local variance Spatial autocorrelation Three-term local quadratvariance },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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