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dc.contributor.advisorMencuccini, Maurizio
dc.contributor.advisorGrace, John
dc.contributor.advisorNichol, Caroline
dc.contributor.authorMizunuma, Toshie
dc.date.accessioned2015-06-19T14:49:56Z
dc.date.available2015-06-19T14:49:56Z
dc.date.issued30/06/2015
dc.identifier.urihttp://hdl.handle.net/1842/10446
dc.description.abstractIn the terrestrial biosphere forests have a significant role as a carbon sink. Under recent climate change, it is increasingly important to detect seasonal change or ‘phenology’ that can influence the global carbon cycle. Monitoring canopies using camera systems has offered an inexpensive means to quantify the phenological changes. However, the reliability is not well known. In order to examine the usefulness of cameras to observe forest phenology, we analysed canopy images taken in two deciduous forests in Japan and England and investigate which colour index is best for tracking forest phenology and predict carbon uptake by trees. A camera test using model leaves under controlled conditions has also carried out to examine sensitivity of colour indices for discriminating leaf colours. The main findings of the present study are: 1) Time courses of colour indices derived from images taken in deciduous forests showed typical patterns throughout the growing season. Although cameras are not calibrated instrument, analysis of images allowed detecting the timings of phenological events such as leaf onset and leaf fall; 2) The strength of the green channel (or chromatic coordinate of green) was useful to observe leaf expansion as well as damage by spring late frost. However, the results of the camera test using model leaves suggested that this index was not sufficiently sensitive to detect leaf senescence. Amongst colour indices, Hue was the most robust metric for different cameras, different atmospheric conditions and different distances. The test also revealed Hue was useful to track nitrogen status of leaves; 3) Modelling results using a light use efficiency model for GPP showed a strong relationship between GPP and Hue, which was stronger than the relationships using alternative traditional indices.en
dc.contributor.sponsorotheren
dc.language.isoenen
dc.publisherThe University of Edinburghen
dc.relation.hasversionMizunuma, T., Koyanagi, T., Mencuccini, M., Nasahara, K.N., Wingate, L. & Grace, J. (2011) The comparison of several colour indices for the photographic recording of canopy phenology of Fagus crenata Blume in eastern Japan. Plant Ecology & Diversity, 4, 67-77.en
dc.relation.hasversionMizunuma, T., Wilkinson, M., Eaton, E.L., Mencuccini, M., Morison, J.I.L. & Grace, J. (2013) The relationship between carbon dioxide uptake and canopy colour from two camera systems in a deciduous forest in southern England. Functional Ecology, 27, 196-207.en
dc.relation.hasversionVilhar, U., Beuker, E., Mizunuma, T., Skudnik, M., Lebourgeois, F., Soudani, K. & Wilkinson, M. (2013) Tree Phenology. Forest Monitoring: Methods for Terrestrial Investigations in Europe with an Overview of North America and Asia (eds M. Ferretti & R. Fischer). Elsevier, Amsterdam.en
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectcarbon fluxen
dc.subjectcolour indexen
dc.subjectdigital imageen
dc.subjectdeciduous broadleaved foresten
dc.subjectHSLen
dc.subjecthueen
dc.subjectleaf phenologyen
dc.subjectMunsell Colour Charten
dc.subjectQuercus roburen
dc.subjectRGBen
dc.subjectvegetation indexen
dc.subjectcarbon flux
dc.subjectcolour index
dc.subjectdigital image
dc.subjectdeciduous broadleaved forest
dc.subjectHSL
dc.subjecthue
dc.subjectleaf phenology
dc.subjectMunsell Colour Chart
dc.subjectQuercus robur
dc.subjectRGB
dc.subjectvegetation index
dc.subjectGlobal Change Research Institute
dc.titleSeasonal patterns of forest canopy and their relevance for the global carbon cycleen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen


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