LeiLechowicz1998

Référence

Lei, T.T., Lechowicz, M.J. (1998) Diverse responses of maple saplings to forest light regimes. Annals of Botany, 82(1):9-19.

Résumé

Seedlings of 11 species of forest maples (Acer L.) were grown outdoors from budburst to senescence under three light regimes: 'gap centre under clear skies' (approx. 20% open sky irradiance; red:far-red ratio = 1.12); 'gap centre under cloudy skies' (1.5 %, ratio = 1.03); and 'gap edge' (2.5 %, ratio = 0.6). Seedlings grown under the gap centre (clear sky) regime had significantly greater height growth, greater specific leaf mass, higher root:shoot ratio, greater investment in roots, higher leaf nitrogen concentrations, greater chlorophyll a:b ratio, lower photosynthetic rates under dim light, higher maximum photosynthetic rate, higher stomatal conductance, and lower leaf internal CO2 concentrations compared with those grown in either gap edge or gap centre (cloudy) regimes. Responses to the gap edge vs. gap centre (cloudy) treatments differ little, suggesting that shade acclimation in forest maple seedlings is mainly a response to light intensity rather than spectral quality. The ubiquitous and, except for leaf internal CO2 concentration, highly significant interspecific variation in traits was broad-ranging and continuous. These results suggest that (1) the responses to light quality found in shade intolerant herbaceous and woody species growing in more open habitats may not have a selective advantage in seedlings of shade tolerant forest trees, and (2) the adaptive plastic response to understorey vs. gap environments in forest maples, which is qualitatively consistent across species, is founded on co-ordinated, small shifts in sets of functionally inter, related traits.

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@ARTICLE { LeiLechowicz1998,
    AUTHOR = { Lei, T.T. and Lechowicz, M.J. },
    TITLE = { Diverse responses of maple saplings to forest light regimes },
    JOURNAL = { Annals of Botany },
    YEAR = { 1998 },
    VOLUME = { 82 },
    PAGES = { 9-19 },
    NUMBER = { 1 },
    NOTE = { 03057364 (ISSN) Cited By (since 1996): 23 Export Date: 26 April 2007 Source: Scopus CODEN: ANBOA doi: 10.1006/anbo.1998.0644 Language of Original Document: English Correspondence Address: Lei, T.T.; Department of Biology; Virginia Tech. 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    ABSTRACT = { Seedlings of 11 species of forest maples (Acer L.) were grown outdoors from budburst to senescence under three light regimes: 'gap centre under clear skies' (approx. 20% open sky irradiance; red:far-red ratio = 1.12); 'gap centre under cloudy skies' (1.5 %, ratio = 1.03); and 'gap edge' (2.5 %, ratio = 0.6). Seedlings grown under the gap centre (clear sky) regime had significantly greater height growth, greater specific leaf mass, higher root:shoot ratio, greater investment in roots, higher leaf nitrogen concentrations, greater chlorophyll a:b ratio, lower photosynthetic rates under dim light, higher maximum photosynthetic rate, higher stomatal conductance, and lower leaf internal CO2 concentrations compared with those grown in either gap edge or gap centre (cloudy) regimes. Responses to the gap edge vs. gap centre (cloudy) treatments differ little, suggesting that shade acclimation in forest maple seedlings is mainly a response to light intensity rather than spectral quality. The ubiquitous and, except for leaf internal CO2 concentration, highly significant interspecific variation in traits was broad-ranging and continuous. These results suggest that (1) the responses to light quality found in shade intolerant herbaceous and woody species growing in more open habitats may not have a selective advantage in seedlings of shade tolerant forest trees, and (2) the adaptive plastic response to understorey vs. gap environments in forest maples, which is qualitatively consistent across species, is founded on co-ordinated, small shifts in sets of functionally inter, related traits. },
    KEYWORDS = { Acer Forest gap heterogeneity Growth form Leaf chlorophyll Nitrogen Photosynthesis Plasticity Root growth Root:shoot ratio Specific leaf mass Stomatal density forest growth response light regime sapling Acer },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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