PrevostRaymond2012

Référence

Prévost, M., Raymond, P. (2012) Effect of gap size, aspect and slope on available light and soil temperature after patch-selection cutting in yellow birch-conifer stands, Quebec, Canada. Forest Ecology and Management, 274:210-221. (Scopus )

Résumé

Solar radiation, photosynthetically active radiation (PAR) and soil temperature were monitored during three summers following establishment of silvicultural gaps (1-ha square patch clearcut, 20- and 30-m diameter circular gaps) in yellow birch-conifer stands, in eastern Quebec, Canada (47°N latitude, 72°W longitude). We assessed the effect of aspect, slope, opening size, and location within the opening on the microclimate in a foothill site characteristic of this forest type. Daily solar radiation averaged 9.7, 14.3, and 15.1MJ/m 2 in the patch clearcut, in 2001, 2002, and 2003, respectively, as compared to 1.7, 2.2, and 2.8MJ/m 2 in the understory of the uncut forest. We also determined that the ratio of PAR to broadband solar radiation was quite constant in the patch clearcut (1.67mol/MJ), while it increased from 0.76mol/MJ (June-September) to 1.49mol/MJ (October) in the forest understory, as broadleaved trees in the main canopy lost their foliage. Circular gaps received intermediate levels of solar radiation (3.9, 6.3, and 7.3MJ/m 2) that were comparable for the 20- and 30-m gap diameters. Solar radiation was consistently lower in the southern portion of these gaps than in their central and northern portions, a relative shortfall of 40-50% on north-facing aspects, and 25% on east-southeast aspects. This microclimatic diversity among locations was confirmed by PAR measurements and soil temperature monitoring, which suggests that differing ecological niches may promote species coexistence in these mixedwood stands. © 2012 Elsevier B.V..

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@ARTICLE { PrevostRaymond2012,
    AUTHOR = { Prévost, M. and Raymond, P. },
    JOURNAL = { Forest Ecology and Management },
    TITLE = { Effect of gap size, aspect and slope on available light and soil temperature after patch-selection cutting in yellow birch-conifer stands, Quebec, Canada },
    YEAR = { 2012 },
    NOTE = { cited By 49 },
    PAGES = { 210-221 },
    VOLUME = { 274 },
    ABSTRACT = { Solar radiation, photosynthetically active radiation (PAR) and soil temperature were monitored during three summers following establishment of silvicultural gaps (1-ha square patch clearcut, 20- and 30-m diameter circular gaps) in yellow birch-conifer stands, in eastern Quebec, Canada (47°N latitude, 72°W longitude). We assessed the effect of aspect, slope, opening size, and location within the opening on the microclimate in a foothill site characteristic of this forest type. Daily solar radiation averaged 9.7, 14.3, and 15.1MJ/m 2 in the patch clearcut, in 2001, 2002, and 2003, respectively, as compared to 1.7, 2.2, and 2.8MJ/m 2 in the understory of the uncut forest. We also determined that the ratio of PAR to broadband solar radiation was quite constant in the patch clearcut (1.67mol/MJ), while it increased from 0.76mol/MJ (June-September) to 1.49mol/MJ (October) in the forest understory, as broadleaved trees in the main canopy lost their foliage. Circular gaps received intermediate levels of solar radiation (3.9, 6.3, and 7.3MJ/m 2) that were comparable for the 20- and 30-m gap diameters. Solar radiation was consistently lower in the southern portion of these gaps than in their central and northern portions, a relative shortfall of 40-50% on north-facing aspects, and 25% on east-southeast aspects. This microclimatic diversity among locations was confirmed by PAR measurements and soil temperature monitoring, which suggests that differing ecological niches may promote species coexistence in these mixedwood stands. © 2012 Elsevier B.V.. },
    AFFILIATION = { Ministère des Ressources naturelles et de la Faune, Forêt Québec, Direction de la recherche forestière, 2700 rue Einstein, Québec, QC, G1P 3W8, Canada },
    AUTHOR_KEYWORDS = { Hillslope site; Patch-selection cutting; PPFD; Silvicultural gap; Soil temperature; Solar radiation },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.foreco.2012.02.020 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859986060&doi=10.1016%2fj.foreco.2012.02.020&partnerID=40&md5=48fa5df8087512ea52d7737e43834e11 },
}

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