PaquetteBouchardCogliastro2007a

Référence

Paquette, A., Bouchard, A., Cogliastro, A. (2007) A less restrictive technique for the estimation of understory light under variable weather conditions. Forest Ecology and Management, 242(2-3):800-804.

Résumé

Many techniques have been developed to estimate mean available light in forest understories. The standard methods estimate average seasonal PAR by recording it in situ with quantum sensors or through simulation using hemispherical image analysis (HIA). Other techniques have been developed to overcome some of the drawbacks of the standard methods, such as high cost, cumbersome equipment, user bias, and limited replication. The "Overcast" method allows rapid evaluation of average seasonal PAR in most situations by taking instantaneous measurements, but is restricted by the overcast sky conditions required. The present study proposes a new, less restrictive method (BF2), that uses a sensor array under a hemispherical dome to overcome the sky condition restrictions of the Overcast method, and tests it against the Overcast and HIA techniques. The study also evaluates the method's ability to predict seedling growth and morphology. The BF2 method provided rapid and precise estimations of %PAR under variable sky conditions, as well as good estimations of seedling's responses, and is suitable for multiple site or highly replicated designs. The methods were used under deciduous stands with contrasting structures. © 2007 Elsevier B.V. All rights reserved.

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@ARTICLE { PaquetteBouchardCogliastro2007a,
    AUTHOR = { Paquette, A. and Bouchard, A. and Cogliastro, A. },
    TITLE = { A less restrictive technique for the estimation of understory light under variable weather conditions },
    JOURNAL = { Forest Ecology and Management },
    YEAR = { 2007 },
    VOLUME = { 242 },
    PAGES = { 800--804 },
    NUMBER = { 2-3 },
    ABSTRACT = { Many techniques have been developed to estimate mean available light in forest understories. The standard methods estimate average seasonal PAR by recording it in situ with quantum sensors or through simulation using hemispherical image analysis (HIA). Other techniques have been developed to overcome some of the drawbacks of the standard methods, such as high cost, cumbersome equipment, user bias, and limited replication. The "Overcast" method allows rapid evaluation of average seasonal PAR in most situations by taking instantaneous measurements, but is restricted by the overcast sky conditions required. The present study proposes a new, less restrictive method (BF2), that uses a sensor array under a hemispherical dome to overcome the sky condition restrictions of the Overcast method, and tests it against the Overcast and HIA techniques. The study also evaluates the method's ability to predict seedling growth and morphology. The BF2 method provided rapid and precise estimations of %PAR under variable sky conditions, as well as good estimations of seedling's responses, and is suitable for multiple site or highly replicated designs. The methods were used under deciduous stands with contrasting structures. © 2007 Elsevier B.V. All rights reserved. },
    ADDRESS = { Institut de recherche en biologie ve?ge?tale (IRBV), Universite? de Montre?al, Centre d'e?tude de la fore?t (CEF), 4101 rue Sherbrooke Est, Montre?al, Que. H1X 2B2, Canada },
    COMMENT = { Export Date: 30 August 2007 Source: Scopus CODEN: FECMD doi: 10.1016/j.foreco.2007.01.067 Language of Original Document: English Correspondence Address: Paquette, A.; Institut de recherche en biologie ve?ge?tale (IRBV); Universite? de Montre?al; Centre d'e?tude de la fore?t (CEF); 4101 rue Sherbrooke Est Montre?al, Que. H1X 2B2, Canada; email: alain.paquette@gmail.com },
    ISSN = { 03781127 (ISSN) },
    KEYWORDS = { PPFD, Available understory light estimation, Beam fractions, BF2, Diffuse light, Hemispherical image analysis, Overcast sky },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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