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Optical properties of bark in selected shrub species

Bojana Ropret (2018) Optical properties of bark in selected shrub species. MSc thesis.

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    Abstract

    In the master’s thesis, we have studied optical properties and physiological, morphological and biochemical characteristics of the bark in four shrub species: common hazel (Corylus avellana), black elder (Sambucus nigra), common privet (Ligustrum vulgare) and dog rose (Rosa canina). In the wavelength range between 280 nm and 885 nm, we measured the reflectivity and transmittance of the crust. We studied the photochemical effectiveness of FS II and determined the amounts of the chlorophylls a and b, carotenoids, anthocyanins and UV-B and UV-A absorbing substances in the bark. We analysed anatomic and morphological characteristics of the bark using a cross-sections of the stem. The thickness of the periderm should exert an impact on optical characteristics of the bark, but light transmittance and reflectance depend on the number of living or dead cells in the phellem (cork). The content of individual pigments depends on light conditions, which differed among species. The light transmittance reach their maximum in the green range (579 nm) and reflectance reach their maximum in the yellow range (600 nm). The analysis of the correlation of optical properties with morphological and biochemical properties has shown more importance in the morphology of the outer layers of the stem compared to biochemical properties.

    Item Type: Thesis (MSc thesis)
    Keywords: optical properties, bark, Sambucus nigra, Corylus avellana, Ligustrum vulgare, Rosa arvensis, reflectance, transmittance
    Number of Pages: 49
    Language of Content: Slovenian
    Mentor / Comentors:
    Mentor / ComentorsIDFunction
    prof. dr. Alenka GaberščikMentor
    Link to COBISS: http://www.cobiss.si/scripts/cobiss?command=search&base=50126&select=(ID=12027721)
    Institution: University of Ljubljana
    Department: Faculty of Education
    Item ID: 5112
    Date Deposited: 20 Jun 2018 08:39
    Last Modified: 20 Jun 2018 08:39
    URI: http://pefprints.pef.uni-lj.si/id/eprint/5112

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