Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions

0485228 - ÚVGZ 2019 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Kováč, Daniel - Ač, Alexander - Veselovská, Petra - Dreveňáková, Petra - Rapantová, Barbora - Klem, Karel
Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions.
Quo vaditis agriculture, forestry and society under global change? Conference proceeding. Brno: Global change research institute, 2017 - (Urban, O.; Šprtová, M.; Klem, K.), s. 62-65. ISBN 978-80-87902-22-6.
[Quo vaditis agriculture, forestry and society under Global Change? Velké Karlovice (CZ), 02.10.2017-04.10.2017]
Grant CEP: GA MŠMT(CZ) LO1415; GA MŠMT(CZ) LM2015061
Institucionální podpora: RVO:86652079
Klíčová slova: vegetation indices * various time scale * environmental conditions
Obor OECD: Environmental sciences (social aspects to be 5.7)

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).
Trvalý link: http://hdl.handle.net/11104/0280297