MessaoudBergeronAsselin2007

Référence

Messaoud, Y., Bergeron, Y. and Asselin, H. (2007) Reproductive potential of balsam fir (Abies balsamea), white spruce (Picea glauca), and black spruce (P. mariana) at the ecotone between mixedwood and coniferous forests in the boreal zone of western Quebec. American Journal of Botany, 94(5):746-54. (Scopus )

Résumé

The reproductive potentials of balsam fir and white spruce (co-dominants in mixedwood forests) and black spruce (dominant in coniferous forests) were studied to explain the location of the ecotone between the two forest types in the boreal zone of Quebec. Four sites were selected along a latitudinal gradient crossing the ecotone. Cone crop, number of seeds per cone, percentage filled seeds, and percentage germination were measured for each species. Balsam fir and white spruce cone crops were significantly lower in the coniferous than in the mixedwood forest, while black spruce had greater crop constancy and regularity between both forest types. Mast years were more frequent for black spruce than for balsam fir in both forest types (mast year data not available for white spruce). The number of seeds per cone was more related to cone size than to forest type for all species. Black spruce produced more filled seeds in the coniferous forest than balsam fir or white spruce. The sum of growing degree-days and the maximum temperature of the warmest month (both for the year prior to cone production) significantly affected balsam fir cone production. The climate-related northward decrease in reproductive potential of balsam fir and white spruce could partly explain the position of the northern limit of the mixedwood forest. This could change drastically, however, as the ongoing climate warming might cancel this competitive advantage of black spruce.

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@ARTICLE { MessaoudBergeronAsselin2007,
    AUTHOR = { Messaoud, Y. and Bergeron, Y. and Asselin, H. },
    TITLE = { Reproductive potential of balsam fir (Abies balsamea), white spruce (Picea glauca), and black spruce (P. mariana) at the ecotone between mixedwood and coniferous forests in the boreal zone of western Quebec },
    JOURNAL = { American Journal of Botany },
    YEAR = { 2007 },
    VOLUME = { 94 },
    PAGES = { 746-54 },
    NUMBER = { 5 },
    ABSTRACT = { The reproductive potentials of balsam fir and white spruce (co-dominants in mixedwood forests) and black spruce (dominant in coniferous forests) were studied to explain the location of the ecotone between the two forest types in the boreal zone of Quebec. Four sites were selected along a latitudinal gradient crossing the ecotone. Cone crop, number of seeds per cone, percentage filled seeds, and percentage germination were measured for each species. Balsam fir and white spruce cone crops were significantly lower in the coniferous than in the mixedwood forest, while black spruce had greater crop constancy and regularity between both forest types. Mast years were more frequent for black spruce than for balsam fir in both forest types (mast year data not available for white spruce). The number of seeds per cone was more related to cone size than to forest type for all species. Black spruce produced more filled seeds in the coniferous forest than balsam fir or white spruce. The sum of growing degree-days and the maximum temperature of the warmest month (both for the year prior to cone production) significantly affected balsam fir cone production. The climate-related northward decrease in reproductive potential of balsam fir and white spruce could partly explain the position of the northern limit of the mixedwood forest. This could change drastically, however, as the ongoing climate warming might cancel this competitive advantage of black spruce. },
    ADDRESS = { NSERC-UQAT-UQAM Industrial Chair in Sustainable Forest Management, Universite? du Que?bec en Abitibi-Te?miscamingue, 445 boul. de l'Universite?, Rouyn-Noranda, Que. J9X 5E4, Canada },
    COMMENT = { Cited By (since 1996): 1 Export Date: 5 December 2008 Source: Scopus CODEN: AJBOA doi: 10.3732/ajb.94.5.746 },
    ISSN = { 00029122 (ISSN) },
    KEYWORDS = { Abies balsamea, Boreal zone, Cone and seed production, Coniferous forest, Ecotone, Mixedwood forest, Picea glauca, Picea mariana, coniferous forest, coniferous tree, dominance, ecotone, evergreen tree, germination, mixed forest, reproductive potential, seed production, Canada, North America, Quebec [Canada], Abies, Abies balsamea, Picea glauca, Picea mariana },
    OWNER = { Luc },
    TIMESTAMP = { 2008.12.05 },
    URL = { http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-34250733088&partnerID=40 },
}

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