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    Model for Calculating Photosynthetic Photon Flux Densities in Forest Openings on Slopes

    Source: Journal of Applied Meteorology:;1993:;volume( 032 ):;issue: 010::page 1656
    Author:
    Chen, Jing M.
    ,
    Black, T. Andrew
    ,
    Price, David T.
    ,
    Carter, Reid E.
    DOI: 10.1175/1520-0450(1993)032<1656:MFCPPF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A model has been developed to calculate the spatial distribution of the photosynthetic photon flux density (PPFD) in elliptical forest openings of given slopes and orientations. The PPFD is separated into direct and diffuse components. The direct component is calculated according to the opening and radiation geometries, and pathlength of the solar beam through the forest canopy. The diffuse component is obtained from the sky, tree, and landscape view factors. In this model, the distribution of foliage area with height and the effect of foliage clumping on both direct and diffuse radiation transmission are considered. The model has been verified using measurements for six quantum sensors (LI-COR Inc.) located at different positions in a small clear-cut (0.37 ha) in a 90-year-old western hemlock-Douglas fir forest.
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      Model for Calculating Photosynthetic Photon Flux Densities in Forest Openings on Slopes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4147257
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    contributor authorChen, Jing M.
    contributor authorBlack, T. Andrew
    contributor authorPrice, David T.
    contributor authorCarter, Reid E.
    date accessioned2017-06-09T14:04:37Z
    date available2017-06-09T14:04:37Z
    date copyright1993/10/01
    date issued1993
    identifier issn0894-8763
    identifier otherams-11970.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4147257
    description abstractA model has been developed to calculate the spatial distribution of the photosynthetic photon flux density (PPFD) in elliptical forest openings of given slopes and orientations. The PPFD is separated into direct and diffuse components. The direct component is calculated according to the opening and radiation geometries, and pathlength of the solar beam through the forest canopy. The diffuse component is obtained from the sky, tree, and landscape view factors. In this model, the distribution of foliage area with height and the effect of foliage clumping on both direct and diffuse radiation transmission are considered. The model has been verified using measurements for six quantum sensors (LI-COR Inc.) located at different positions in a small clear-cut (0.37 ha) in a 90-year-old western hemlock-Douglas fir forest.
    publisherAmerican Meteorological Society
    titleModel for Calculating Photosynthetic Photon Flux Densities in Forest Openings on Slopes
    typeJournal Paper
    journal volume32
    journal issue10
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1993)032<1656:MFCPPF>2.0.CO;2
    journal fristpage1656
    journal lastpage1665
    treeJournal of Applied Meteorology:;1993:;volume( 032 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian