Photosynthetic assimilation of sun versus shade Norway spruce [Picea abies (L.) Karst] needles under the long-term Impact of elevated CO2 concentration

Title:

Photosynthetic assimilation of sun versus shade Norway spruce [Picea abies (L.) Karst] needles under the long-term Impact of elevated CO2 concentration

Creator:

Marek, M. V., Urban, O., Šprtová, M., Pokorný, R., Rosová, Z., and Kulhavý, J.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:ca005c5e-c131-4d31-9666-d6c5ff696236
uuid:ca005c5e-c131-4d31-9666-d6c5ff696236
issn:0300-3604
doi:10.1023/A:1021306010135

Subject:

carboxylation efficiency and rate, CO2 compensation concentration, dark respiration, dense/sparse parts, electron transport rate, quantum yield of assimilation, stand density, and sun/shade

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The long-term impact of elevated concentration of CO2 on assimilation activity of sun-exposed (E) versus shaded (S) foliage was investigated in a Norway spruce stand [Picea abies (L.) Karst, age 14 years] after three years of cultivation in two domes with adjustable windows (DAW). One DAW was supplied with ambient air [AC, ca. 350 µmol(CO2) mol-1) and the second with elevated CO2 concentration [EC = AC plus 350 µmol(CO2) mol-1]. The pronounced vertical profile of the photosynthetic photon flux density (PPFD) led to the typical differentiation of the photosynthetic apparatus between the shaded and sun needles. Namely, photon-saturated values of maximal net photosynthetic rate (PNmax) and apparent quantum yield (α) were significantly higher/lower for E-needles as compared with the S-ones. The prolonged exposure to EC was responsible for the apparent assimilatory activity stimulation observed mainly in deeply shaded needles. The degree of this stimulation decreases in the order: S-needles dense part > S-needles sparse part > E-needles dense part > E-needles sparse part. In exposed needles some signals on a manifestation of the acclimation depression of the photosynthetic activity were found. The long-term effect of EC was responsible for the decrease of nitrogen content of needles and for its smoother gradient between E- and S-needles. The obtained results indicate that the E- and S-foliage respond differently to the long-term impact of EC. and M. V. Marek ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

259-267

Source:

Photosynthetica | 2002 Volume:40 | Number:2

Harvested from:

CDK

Metadata only:

false