BanXuBergeronEtAl1998

Référence

Ban, Y., Xu, H., Bergeron, Y., Kneeshaw, D.D. (1998) Gap regeneration of shade-intolerant Larix gmelini in old-growthboreal forests of northeastern China. Journal of Vegetation Science, 9(4):529-536.

Résumé

Stand mapping and vertical and oblique tree crown projections wereused to study gap characteristics and gap effects on the regenerationand stand development of Larix gmelini. The hypothesis is that wavesof advance Larix regeneration are recruited into the canopy layerfollowing the Creation of canopy openings. In old-growth Larix forestsof the northern Da Xingan Ling Mts., at 52 °N, obliquely projectedgaps (OPG) begin at a distance of 60 - 80 % of the canopy tree heightfrom the southernmost stems bordering the gap and thus the OPGsmay extend beyond the northern boundaries of the vertically projectedgaps (VPG). Changes in the environment and resource availabilityin the OPG result in increased Larix sapling survival. Due to agreater incidence of light, 10 30 yr old OPG saplings were moreabundant than saplings in either a near-oblique projected gap (NOPG)or in the shadow of obliquely projected crowns (SOPC). The survivalof saplings more than 30-yr old was highest when they were foundin the OPG of one canopy opening and the VPG of another. This meansthat, following recruitment into an OPG, saplings then require thespace found in a VPG to permit growth into the canopy. Thus, various-sizedgaps contribute to the survival of different aged saplings by increasingthe complexity of stand structure. Although individuals may regeneratein an OPG, successful recruitment into the canopy requires the availablegrowing space of a VPG. This research suggests that shade intolerantLarix gmelini can maintain its canopy dominance without fire viagap regeneration.

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@ARTICLE { BanXuBergeronEtAl1998,
    AUTHOR = { Ban, Y. and Xu, H. and Bergeron, Y. and Kneeshaw, D.D. },
    TITLE = { Gap regeneration of shade-intolerant Larix gmelini in old-growthboreal forests of northeastern China },
    JOURNAL = { Journal of Vegetation Science },
    YEAR = { 1998 },
    VOLUME = { 9 },
    PAGES = { 529-536 },
    NUMBER = { 4 },
    ABSTRACT = { Stand mapping and vertical and oblique tree crown projections wereused to study gap characteristics and gap effects on the regenerationand stand development of Larix gmelini. The hypothesis is that wavesof advance Larix regeneration are recruited into the canopy layerfollowing the Creation of canopy openings. In old-growth Larix forestsof the northern Da Xingan Ling Mts., at 52 °N, obliquely projectedgaps (OPG) begin at a distance of 60 - 80 % of the canopy tree heightfrom the southernmost stems bordering the gap and thus the OPGsmay extend beyond the northern boundaries of the vertically projectedgaps (VPG). Changes in the environment and resource availabilityin the OPG result in increased Larix sapling survival. Due to agreater incidence of light, 10 30 yr old OPG saplings were moreabundant than saplings in either a near-oblique projected gap (NOPG)or in the shadow of obliquely projected crowns (SOPC). The survivalof saplings more than 30-yr old was highest when they were foundin the OPG of one canopy opening and the VPG of another. This meansthat, following recruitment into an OPG, saplings then require thespace found in a VPG to permit growth into the canopy. Thus, various-sizedgaps contribute to the survival of different aged saplings by increasingthe complexity of stand structure. Although individuals may regeneratein an OPG, successful recruitment into the canopy requires the availablegrowing space of a VPG. This research suggests that shade intolerantLarix gmelini can maintain its canopy dominance without fire viagap regeneration. },
    KEYWORDS = { Age structure Canopy gap Crown projection Da Xingan Ling Mts. Obliquelyprojected gap Sapling survival Spatial pattern Vertically projectedgap Larix gmelinii },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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