Počet záznamů: 1  

Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions

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    0440777 - ÚVGZ 2015 RIV GB eng J - Článek v odborném periodiku
    Urban, Otmar - Klem, Karel - Holišová, Petra - Šigut, Ladislav - Šprtová, Miroslava - Teslová-Navrátilová, P. - Zitová, Martina - Špunda, Vladimír - Marek, Michal V. - Grace, J.
    Impact of elevated CO2 concentration on dynamics of leaf photosynthesis in Fagus sylvatica is modulated by sky conditions.
    Environmental Pollution. Roč. 185, FEB 2014 (2014), s. 271-280. ISSN 0269-7491. E-ISSN 1873-6424
    Grant CEP: GA MŠMT(CZ) LM2010007; GA ČR(CZ) GAP501/10/0340
    Institucionální podpora: RVO:67179843
    Klíčová slova: diurnal dynamics * DEPS * european beech * fluorescence * photorespiration * stomatal conductance * xanthophylls
    Kód oboru RIV: GK - Lesnictví
    Impakt faktor: 4.143, rok: 2014

    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.
    Trvalý link: http://hdl.handle.net/11104/0243901

     
     
Počet záznamů: 1  

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