Temperature dependences of carbon assimilation processes in four dominant species from mountain grassland ecosystem

Title:

Temperature dependences of carbon assimilation processes in four dominant species from mountain grassland ecosystem

Creator:

Urban, O., Ač, A., Kalina, J., Priwitzer, T., Šprtová, M., Špunda, V., and Marek, M. V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:aaff6882-46a0-469d-8129-2109fb8554dc
uuid:aaff6882-46a0-469d-8129-2109fb8554dc
issn:0300-3604
doi:10.1007/s11099-007-0066-5

Subject:

ambient and intercellular CO2 concentrations, carboxylation rate, electron transport rate, photosynthesis, quantum efficiency, respiraation, stomatal conductance, and water use efficiency

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Temperature responses of carbon assimilation processes were studied in four dominant species from mountain grassland ecosystem, i.e. Holcus mollis (L.), Hypericum maculatum (Cr.), Festuca rubra (L.), and Nardus stricta (L.), using the gas exchange technique. Leaf temperature (TL) of all species was adjusted within the range 13-30 °C using the Peltier thermoelectric cooler. The temperature responses of metabolic processes were subsequently modelled using the Arrhenius exponential function involving the temperature coefficient Q10. The expected increase of global temperature led to a significant increase of dark respiration rate (RD; Q 10 = 2.0±0.5), maximum carboxylation rate (VCmax; Q10 = 2.2±0.6), and maximum electron transport rate (J max; Q 10 = 1.6±0.4) in dominant species of mountain grassland ecosystems. Contrariwise, the ratio between Jmax and VCmax linearly decreased with TL [y = -0.884 TL + 5.24; r2 = 0.78]. Hence temperature did not control the ratio between intercellular and ambient CO2 concentration, apparent quantum efficiency, and photon-saturated CO2 assimilation rate (Pmax). Pmax primarily correlated with maximum stomatal conductance irrespective of TL. Water use efficiency tended to decrease with TL [y = -0.21 TL + 8.1; r2 = 0.87]. and O. Urban ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

392-399

Source:

Photosynthetica | 2007 Volume:45 | Number:3

Harvested from:

CDK

Metadata only:

false