Počet záznamů: 1  

Responses in young Quercus petraea: coppices and standards under favourable and drought conditions

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    0465984 - ÚVGZ 2017 RIV PL eng J - Článek v odborném periodiku
    Stojanović, Marko - Čater, M. - Pokorný, Radek
    Responses in young Quercus petraea: coppices and standards under favourable and drought conditions.
    Dendrobiology. Roč. 76, jan (2016), s. 127-136. ISSN 1641-1307. E-ISSN 2083-8387
    Grant CEP: GA MŠMT(CZ) EE2.3.20.0267
    Výzkumná infrastruktura: CzeCOS II - 90061
    Institucionální podpora: RVO:67179843
    Klíčová slova: coppice * standards * comparison * photosynthetic response * quantum yield * light conditions * drought response
    Kód oboru RIV: EF - Botanika
    Impakt faktor: 0.776, rok: 2016

    Assimilation and photosynthetic efficiency (maximal quantum yield) of young oaks were compared
    in coppice and standard sessile oak stands of comparable age (100 years) under different light intensity
    categories: under minimum light – ISF < 20%, low light – 20%<ISF<25%, medium light – 25%<ISF<30%
    and in the open, without mature canopy cover – ISF >30% during favourable and drought conditions.
    Measurements of maximal assimilation rates were performed at a constant temperature of the measurement
    block (20°C), a CO2 concentration of 400 μmol/l, flow 500 μmol/s and different light intensities: 0,
    50, 250, 600, 1200 and 1800 μmol/m2s during three consecutive growing seasons (2012, 2013 and 2014).
    In every category at least 8 young naturally regenerated seedlings and sprouts of different coppice stools
    were measured. The quantum yield in optimal conditions in standards was highest in the category of closed
    canopy, while in coppices in medium light category. During severe drought in 2013 the drop in efficiency
    of standards was evident in all categories, while in coppices no differences in efficiency were observed between
    favourable 2012 and 2013 with expressed drought stress, proving the advantage of young coppices
    over standards in this particular light category. However, the beneficial effects of restoration coppicing are
    not guaranteed. It is our belief that in time such advantage might decrease; it would be therefore interesting
    to compare responses in time and define, when response abilities of both studied systems become equal.
    Trvalý link: http://hdl.handle.net/11104/0264436

     
     
Počet záznamů: 1  

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