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Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions
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SYSNO ASEP 0440777 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions Author(s) Urban, Otmar (UEK-B) RID, ORCID, SAI
Klem, Karel (UEK-B) RID, ORCID, SAI
Holišová, Petra (UEK-B) RID, SAI
Šigut, Ladislav (UEK-B) RID, ORCID, SAI
Šprtová, Miroslava (UEK-B) RID, SAI
Teslová-Navrátilová, P. (CZ)
Zitová, Martina (UEK-B)
Špunda, Vladimír (UEK-B) ORCID, SAI, RID
Marek, Michal V. (UEK-B) RID, ORCID, SAI
Grace, J. (GB)Source Title Environmental Pollution. - : Elsevier - ISSN 0269-7491
Roč. 185, FEB 2014 (2014), s. 271-280Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords diurnal dynamics ; DEPS ; european beech ; fluorescence ; photorespiration ; stomatal conductance ; xanthophylls Subject RIV GK - Forestry R&D Projects LM2010007 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GAP501/10/0340 GA ČR - Czech Science Foundation (CSF) Institutional support RVO:67179843 - RVO:67179843 UT WOS 000331672500034 EID SCOPUS 84889632564 DOI https://doi.org/10.1016/j.envpol.2013.11.009 Annotation It has been suggested that atmospheric CO2 concentration and frequency of cloud cover will increase in future. It remains unclear, however, how elevated CO2 influences photosynthesis under complex clear versus cloudy sky conditions. Accordingly, diurnal changes in photosynthetic responses among beech trees grown at ambient (AC) and doubled (EC) CO2 concentrations were studied under contrasting sky conditions. EC stimulated the daily sum of fixed CO2 and light use efficiency under clear sky. Meanwhile, both these parameters were reduced under cloudy sky as compared with AC treatment. Reduction in photosynthesis rate under cloudy sky was particularly associated with EC-stimulated, xanthophyll-dependent thermal dissipation of absorbed light energy. Under clear sky, a pronounced afternoon depression of CO2 assimilation rate was found in sun-adapted leaves under EC compared with AC conditions. This was caused in particular by stomata closure mediated by vapour pressure deficit. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2015
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