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Spectral Characteristics of Natural and Laboratory-Induced Leaf Senescence in Four Common North American Tree Species

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    Publication properties
    Title: Spectral Characteristics of Natural and Laboratory-Induced Leaf Senescence in Four Common North American Tree Species
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    Date: 2016
    Publication type: Technical report
    Authors:
    No. First name Last name Show
    1. SEP C
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    Keywords
    1. Chlorophyll
    2. Leaf spectra
    3. Senescence

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    Venue
    Department of Geography, University of Winnipeg, Canada 915 Portage Ave., Winnipeg, MB, Canada, R3B 2E8

    Abstract

    Two laboratory techniques (air drying and oven drying) were implemented to compare the spectral reflectance differences between laboratory-induced and natural leaf senescence. The spectral signatures of four common North American tree species were recorded over the 2011 summ er-autumn season. Natural ‘on-tree’ senescence was measured throughout the senescence period and simultaneously with the two laboratory methods. Two substantial differences were observed between the natural senescence and laboratory techniques: the persistence of the ‘green peak’ for the laboratory methods; and the much higher reflectance values throughout the middle infrared region for the laboratory methods. These results suggested that a more sophisticated laboratory method including the ability to export leaf constituents during senescence is required to accurately reproduce autumn leaf senescence in a laboratory setting. If achieved, this could greatly improve analyst’s ability to reproduce the spectral changes associated with vegetation health and leaf senescence.