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Spectral composition of photosynthetically active radiation penetrating into a Norway spruce canopy: the opposite dynamics of the blue/red spectral ratio during clear and overcast days

Result description

The spectral composition of photosynthetically active radiation (PAR) during clear and overcast days was studied above the canopy (U) and at two layers of a dense Norway spruce stand [Picea abies (L.) Karst.] characterized with an average LAI = 7.3 +/- 0.8 (middle layer: M) and 12.3 +/- 0.7 (lower layer: L). Whereas the spectral composition of PAR incoming on the canopy surface during cloudy days (characterized by diffuse index DI > 0.7) was almost independent of the solar elevation angle, the proportion of the blue-green spectral region of PAR was significantly reduced at low elevation angles during days with prevailing direct radiation (DI < 0.3). The PAR spectrum at both M and L levels was only slightly enriched in the green spectral region (more pronounced for DI < 0.3).

Keywords

photosynthetically active radiationspectral compositiondiffuse indexsolar elevationNorway spruce canopy

The result's identifiers

  • Result code in IS VaVaI

    RIV/61988987:17310/07:00000083 - isvavai.cz

  • Alternative codes found

    RIV/62156489:43410/07:00113108 RIV/67179843:_____/07:00089783 RIV/67179843:_____/07:00341991

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Spectral composition of photosynthetically active radiation penetrating into a Norway spruce canopy: the opposite dynamics of the blue/red spectral ratio during clear and overcast days

  • Original language description

    The spectral composition of photosynthetically active radiation (PAR) during clear and overcast days was studied above the canopy (U) and at two layers of a dense Norway spruce stand [Picea abies (L.) Karst.] characterized with an average LAI = 7.3 +/- 0.8 (middle layer: M) and 12.3 +/- 0.7 (lower layer: L). Whereas the spectral composition of PAR incoming on the canopy surface during cloudy days (characterized by diffuse index DI > 0.7) was almost independent of the solar elevation angle, the proportion of the blue-green spectral region of PAR was significantly reduced at low elevation angles during days with prevailing direct radiation (DI < 0.3). The PAR spectrum at both M and L levels was only slightly enriched in the green spectral region (more pronounced for DI < 0.3).

  • Czech name

    Spektrální složení fotosynteticky aktivní radiace pronikající do porostu smrku ztepilého: opačná dynamika spektrálního poměru modré/červené oblasti během jasných a zatažených dnů

  • Czech description

    Spektrální složení fotosynteticky aktivní radiace (FAR) v průběhu jasných a zatažených dnů bylo studováno nad porostem a ve dvou vrstvách hustého porostu smrku ztepilého [Picea abies (L.) Karst.] charakterizovaného průměrným LAI = 7.3 +/- 0.8 (střední vrstva: M) a 12.3 +/- 0.7 (spodní vrstva: L). Zatímco spektrální složení FAR dopadající na povrch porostu v průběhu zatažených dnů (charakterizovaných difúzním indexem DI > 0.7) bylo téměř nezávislé na solárním elevačním úhlu, naopak při převládající příméradiaci (DI < 0.3) bylo při nízkých elevačních úhlech zastoupení v modrozelené spektrální oblasti FAR výrazně redukováno. Spektrum FAR jak ve střední (

Classification

  • Type

    Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BO - Biophysics

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2007

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Trees - Structure and Function

  • ISSN

    0931-1890

  • e-ISSN

  • Volume of the periodical

    21

  • Issue of the periodical within the volume

  • Country of publishing house

    DE - GERMANY

  • Number of pages

    10

  • Pages from-to

    311

  • UT code for WoS article

  • EID of the result in the Scopus database