Climate sensitivity of radial growth in Norway spruce (Picea abies (L.) Karst.) under different CO2 concentrations

0474441 - ÚVGZ 2018 RIV EE eng J - Journal Article
Aysan Badraghi, Naghimeh - Pokorný, Radek - Novosadová, Kateřina - Pietras, Justyna - Marek, Michal V.
Climate sensitivity of radial growth in Norway spruce (Picea abies (L.) Karst.) under different CO2 concentrations.
Forestry studies. Roč. 65, č. 1 (2017), s. 43-56. ISSN 1736-8723
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0073
Institutional support: RVO:67179843
Keywords : ambient CO2 * elevated CO2 * wood formation * radial increment * carbon relations * conifers
OECD category: Environmental sciences (social aspects to be 5.7)

This investigation examined the effects of two different carbon dioxide concentrations
([CO2]): Ambient (A, 385 μmol (CO2) mol−1) and elevated (E, A+385 μmol (CO2) mol−1))
on the tree-ring width and early to latewood proportion in Norway spruce for seven years
(2006–2012). Further, to improve our understanding of the infl uence of climatic variables,
we assessed the effects of precipitation and temperature. Our observations showed that
spruce trees growing under elevated CO2 (EC) formed less early (p > 0.05) and latewood (p
< 0.05) and hence smaller annual increments (p > 0.05) than trees in ambient CO2 (AC). Early
to latewood proportion was nearly 73% and 75% in AC and EC, respectively. In both CO2
concentrations, the largest tree-rings and earlywood width was observed during 2009 and
2010, which is coincident with the highest precipitation in May (2010) and the highest air
temperature in April (2009). Moreover, to determine the association between the latewood
formation and air temperature during the second half of the growing season, and correlation
between the earlywood formation and precipitation during the fi rst half of the growing
season we run Spearman’s correlation test, the determination coeffi cient values for latewood
formation were r = 0.45 (AC) and r = 0.68 (EC), and for earlywood formation were r = 0.53
(AC) and r = 0.42 (EC), although coeffi cient values were not statistically signifi cant (p > 0.05).
Also, our study indicated that temperature had stonger infl uence than precipitation in EC,
but in AC precipitation had the strongest effect on radial growth.
Permanent Link: http://hdl.handle.net/11104/0271492