Effect of elevated CO2 on morphological and photosynthetic parameters in two understory grass species in Beskydy Mountains

0485206 - ÚVGZ 2019 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Holub, Petr - Klem, Karel - Urban, Otmar
Effect of elevated CO2 on morphological and photosynthetic parameters in two understory grass species in Beskydy Mountains.
Quo vaditis agriculture, forestry and society under global change? Conference proceeding. Brno: Global change research institute, 2017 - (Urban, O.; Šprtová, M.; Klem, K.), s. 38-41. 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) EF16_013/0001609
Institucionální podpora: RVO:86652079
Klíčová slova: Effect of elevated CO2 * photosynthetic parametrs * Beskydy mountains
Obor OECD: Environmental sciences (social aspects to be 5.7)

We transplanted two grass species, Calamagrostis arundinacea and Luzula sylvatica, to the understory of
a 10-year-old experimental mixed forest exposed to ambient (385 μmol CO2 mol–1, AC) and elevated (700
μmol CO2 mol–1, EC) atmospheric CO2 concentration using a glass dome facility. Effects of EC on plant
morphology and photosynthesis were examined after three years of treatment. We tested the hypotheses
that shade-tolerant species can profit from EC even at low light conditions and that relatively low accumulation
of assimilates at such light conditions will not cause CO2-induced down-regulation of photosynthesis.
We expected that EC can substitute insufficient light intensities under the tree canopy and lead to both
higher biomass production and survival of plants in deep forest understories. The typical shade-tolerant
species L. sylvatica exhibited positive acclimation under EC allowing higher light use efficiency under subsaturating
light intensities as compared to plants grown under AC. In contrast, C. arundinacea showed
higher stimulation of growth and photosynthetic rates by EC mainly under saturating light intensities at
the beginning of the growing season, when the forest leaf area is not fully developed and the open canopy
allows a greater proportion of incident light to reach the understory. Our data indicate that growth and
physiological responses of EC plants in forest understories are species specific, differ from responses of
sun-exposed plants, and depend on degree of shading.
Trvalý link: http://hdl.handle.net/11104/0280278