Lechowicz1984

Référence

Lechowicz, M.J. (1984) Why do temperate deciduous trees leaf out at different times? Adaptation and ecology of forest communities. American Naturalist, 124(6):821-842.

Résumé

Time of spring leaf emergence varies consistently among deciduous tree species in the north temperate forests of both E North America and Eurasia. Tree species that leaf earliest have only narrow-diameter xylem vessels (diffuse-porous wood anatomy) and relatively low numbers of vessels per unit wood volume, eg most members of the genera Populus, Betula, Salix, Alnus, Ostrya, Acer, Carpinus, Prunus and Aesculus. Later-leafing trees are characterized by having distinctly larger-diameter xylem vessels produced in their early, spring wood (ring-porous wood anatomy) and/or, especially in diffuse-porous species, relatively high numbers of vessels per unit wood volume. Both these traits contribute to greater maximum potential water conduction capacity. Among diffuse-porous species earlier leafing is also associated with greater indeterminancy of shoot growth; the earliest-leafing taxa initially flush only a few early leaves followed by a series of individual morphologically distinct late leaves on some shoots through the summer (heterophylly). Cambial activity must precede leaf emergence in ring-porous species; this explains the relatively late leafing of ring-porous genera like Fraxinus, Quercus, Rhus, Ulmus, Sassafras, Morus, Maclura, Carya and Juglans. -from Author

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@ARTICLE { Lechowicz1984,
    AUTHOR = { Lechowicz, M.J. },
    TITLE = { Why do temperate deciduous trees leaf out at different times? Adaptation and ecology of forest communities },
    JOURNAL = { American Naturalist },
    YEAR = { 1984 },
    VOLUME = { 124 },
    PAGES = { 821-842 },
    NUMBER = { 6 },
    NOTE = { 00030147 (ISSN) Cited By (since 1996): 68 Export Date: 26 April 2007 Source: Scopus Language of Original Document: English },
    ABSTRACT = { Time of spring leaf emergence varies consistently among deciduous tree species in the north temperate forests of both E North America and Eurasia. Tree species that leaf earliest have only narrow-diameter xylem vessels (diffuse-porous wood anatomy) and relatively low numbers of vessels per unit wood volume, eg most members of the genera Populus, Betula, Salix, Alnus, Ostrya, Acer, Carpinus, Prunus and Aesculus. Later-leafing trees are characterized by having distinctly larger-diameter xylem vessels produced in their early, spring wood (ring-porous wood anatomy) and/or, especially in diffuse-porous species, relatively high numbers of vessels per unit wood volume. Both these traits contribute to greater maximum potential water conduction capacity. Among diffuse-porous species earlier leafing is also associated with greater indeterminancy of shoot growth; the earliest-leafing taxa initially flush only a few early leaves followed by a series of individual morphologically distinct late leaves on some shoots through the summer (heterophylly). Cambial activity must precede leaf emergence in ring-porous species; this explains the relatively late leafing of ring-porous genera like Fraxinus, Quercus, Rhus, Ulmus, Sassafras, Morus, Maclura, Carya and Juglans. -from Author },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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