TakahashiLechowicz2008

Référence

Takahashi, K., Lechowicz, M.J. (2008) Do interspecific differences in sapling growth traits contribute to the co-dominance of Acer saccharum and Fagus grandifolia? Annals of Botany, 101(1):103-109. (Scopus )

Résumé

? Background and Aims: Acer saccharumand Fagus grandifolia are among the most dominant late-successional tree species in North America. The influence of sapling growth responses to canopy gaps on the co-dominance of the two species in an old-growth forest in southern Quebec, Canada was examined. Two predictions were evaluated: (a) F. grandifolia is more shade tolerant than A. saccharum due to greater sapling leaf area and net production per sapling in closed-canopy conditions; and (b) the height growth rate of A. saccharum in canopy gaps is greater than that of F. grandifolia due to increased net production per sapling. ? Methods: Sapling crown allometry, net production and height growth rates were compared between and within the two species in closed canopy vs. canopy gaps. Standardized major axis regression was used to analyse differences in crown allometry. ? Key Results: F. grandifoliahad greater crown projection, sapling leaf area and net production rate per sapling than A. saccharum in closed-canopy conditions. In response to canopy gaps, net production per sapling increased to the same degree in both species. The net production per sapling of F. grandifolia thus was much greater than that of A. saccharum in both canopy gap and closed-canopy conditions. The height growth rate of both species increased in canopy gaps, but the degree of increase was greater in F. grandifolia than in A. saccharum. ? Conclusions: F. grandifoliaregenerated more successfully than A. saccharum in both closed-canopy conditions and canopy gaps, which indicates that the co-dominance of the two species cannot be maintained simply by interspecific differences in shade tolerance and growth in gaps. Previous research showed that although Fagus and Acer shared dominance at this site, their relative dominance shifted with edaphic conditions. This suggests that the widespread co-dominance of the two species in eastern North American forests is maintained by the joint influence of canopy disturbance and species-specific responses to the heterogeneity of moisture and fertility regimes within forested landscapes. © The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.

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@ARTICLE { TakahashiLechowicz2008,
    AUTHOR = { Takahashi, K. and Lechowicz, M.J. },
    TITLE = { Do interspecific differences in sapling growth traits contribute to the co-dominance of Acer saccharum and Fagus grandifolia? },
    JOURNAL = { Annals of Botany },
    YEAR = { 2008 },
    VOLUME = { 101 },
    PAGES = { 103-109 },
    NUMBER = { 1 },
    ABSTRACT = { ? Background and Aims: Acer saccharumand Fagus grandifolia are among the most dominant late-successional tree species in North America. The influence of sapling growth responses to canopy gaps on the co-dominance of the two species in an old-growth forest in southern Quebec, Canada was examined. Two predictions were evaluated: (a) F. grandifolia is more shade tolerant than A. saccharum due to greater sapling leaf area and net production per sapling in closed-canopy conditions; and (b) the height growth rate of A. saccharum in canopy gaps is greater than that of F. grandifolia due to increased net production per sapling. ? Methods: Sapling crown allometry, net production and height growth rates were compared between and within the two species in closed canopy vs. canopy gaps. Standardized major axis regression was used to analyse differences in crown allometry. ? Key Results: F. grandifoliahad greater crown projection, sapling leaf area and net production rate per sapling than A. saccharum in closed-canopy conditions. In response to canopy gaps, net production per sapling increased to the same degree in both species. The net production per sapling of F. grandifolia thus was much greater than that of A. saccharum in both canopy gap and closed-canopy conditions. The height growth rate of both species increased in canopy gaps, but the degree of increase was greater in F. grandifolia than in A. saccharum. ? Conclusions: F. grandifoliaregenerated more successfully than A. saccharum in both closed-canopy conditions and canopy gaps, which indicates that the co-dominance of the two species cannot be maintained simply by interspecific differences in shade tolerance and growth in gaps. Previous research showed that although Fagus and Acer shared dominance at this site, their relative dominance shifted with edaphic conditions. This suggests that the widespread co-dominance of the two species in eastern North American forests is maintained by the joint influence of canopy disturbance and species-specific responses to the heterogeneity of moisture and fertility regimes within forested landscapes. © The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. },
    DOI = { 10.1093/aob/mcm259 },
    ISSN = { 03057364 (ISSN) },
    KEYWORDS = { American beech, Crown allometry, Crown architecture, Height growth rate, Net production rate, Saplings, Sugar maple },
    OWNER = { Luc },
    TIMESTAMP = { 2008.01.14 },
    URL = { http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-37249059804&partnerID=40&rel=R7.0.0 },
}

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