Home > Conference materials > Papers > Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions
Original title:
Predicting light use efficiency using optical vegetation indices at various time scales and environmental conditions
Authors:
Kováč, Daniel ; Ač, Alexander ; Veselovská, Petra ; Dreveňáková, Petra ; Rapantová, Barbora ; Klem, Karel Document type: Papers Conference/Event: Quo vaditis agriculture, forestry and society under Global Change?, Velké Karlovice (CZ), 20171002
Year:
2017
Language:
eng Abstract:
This study presents data points acquired during 2 years of measuring optical properties and gas-exchange\ncharacteristics of European beech (Fagus sylvatica) and Norway spruce (Picea abies) tree species in controlled\nenvironments. The observed statistical relationships between 105 pairs of selected optical parameters\n(i.e. photochemical reflectance index [PRI], ΔPRI, and normalized difference between wavebands R690\nand R630 [where R is a reflectance at a subscripted wavelength]) and light use efficiency (LUE) were considered\nat assumed different canopy leaf area index, changing pigments stoichiometrics, and daily changing\ndynamics of environmental conditions. Our measurements suggested that consistency of the LUE estimation\nusing PRI may be disrupted by acclimation responses of plants that reduce energetic carriers for\nuse in photosynthetic CO2 uptake and the xanthophyll cycle. Also, a changing chlorophylls-to-carotenoids\nratio tends to interrupt the PRI–LUE relationship. ΔPRI showed sensitivity to leaf area index of the measured\ntrees that complicated leaf-level estimation of LUE. The most consistent assessment of LUE was\nachieved using the chlorophyll fluorescence detecting ratio (R690 – R630)/(R690 + R630).
Keywords:
environmental conditions; various time scale; vegetation indices Project no.: LO1415 (CEP), LM2015061 (CEP) Funding provider: GA MŠk, GA MŠk Host item entry: Quo vaditis agriculture, forestry and society under global change? Conference proceeding, ISBN 978-80-87902-22-6
Institution: Global Change Research Institute AS ČR
(web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences. Original record: http://hdl.handle.net/11104/0280297