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Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions
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SYSNO ASEP 0485228 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions Author(s) Kováč, Daniel (UEK-B) RID, ORCID, SAI
Ač, Alexander (UEK-B) RID, ORCID, SAI
Veselovská, Petra (UEK-B) SAI, RID
Dreveňáková, Petra (UEK-B)
Rapantová, Barbora (UEK-B) RID, SAI
Klem, Karel (UEK-B) RID, ORCID, SAISource Title Quo vaditis agriculture, forestry and society under global change? Conference proceeding. - Brno : Global change research institute, 2017 / Urban O. ; Šprtová M. ; Klem K. - ISBN 978-80-87902-22-6 Pages s. 62-65 Number of pages 4 s. Publication form Print - P Action Quo vaditis agriculture, forestry and society under Global Change? Event date 02.10.2017 - 04.10.2017 VEvent location Velké Karlovice Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords vegetation indices ; various time scale ; environmental conditions Subject RIV EH - Ecology, Behaviour OECD category Environmental sciences (social aspects to be 5.7) R&D Projects LO1415 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015061 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEK-B - RVO:86652079 Annotation This study presents data points acquired during 2 years of measuring optical properties and gas-exchange
characteristics of European beech (Fagus sylvatica) and Norway spruce (Picea abies) tree species in controlled
environments. The observed statistical relationships between 105 pairs of selected optical parameters
(i.e. photochemical reflectance index [PRI], ΔPRI, and normalized difference between wavebands R690
and R630 [where R is a reflectance at a subscripted wavelength]) and light use efficiency (LUE) were considered
at assumed different canopy leaf area index, changing pigments stoichiometrics, and daily changing
dynamics of environmental conditions. Our measurements suggested that consistency of the LUE estimation
using PRI may be disrupted by acclimation responses of plants that reduce energetic carriers for
use in photosynthetic CO2 uptake and the xanthophyll cycle. Also, a changing chlorophylls-to-carotenoids
ratio tends to interrupt the PRI–LUE relationship. ΔPRI showed sensitivity to leaf area index of the measured
trees that complicated leaf-level estimation of LUE. The most consistent assessment of LUE was
achieved using the chlorophyll fluorescence detecting ratio (R690 – R630)/(R690 + R630).Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2019
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