%0 Article
%T Observations on CO2 exchange in open pollinated progenies of Norway spruce and provenances of Scots pine
%A Luukkanen, Olavi
%D 1973
%J Silva Fennica
%V 7
%N 4
%R doi:10.14214/sf.a14726
%U https://silvafennica.fi/article/4888
%X <p>Photosynthesis and dark respiration in five families of autochtonous Norway spruce (<em>Picea abies</em> (L.) H. Karst.) and in seedlings from twenty Finnish stands of Scots pine (<em>Pinus sylvestris</em> L.) were investigated in constant environmental conditions. Values of CO<sub>2</sub> exchange were compared with the height growth and weight of seedlings in Norway spruce and with the weight alone in Scots pine. No statistically significant differences were found in CO<sub>2</sub> exchange among progenies or stands. Photosynthetic efficiency and photosynthetic capacity showed a positive correlation both in spruce and in pine. Growth and net photosynthetic capacity were linearly and positively correlated in pine. Spruce and a higher light compensation point than pine. The use of an open IRGA system with several simultaneous measurements and the trap-type cuvette construction in genetic work are discussed.</p>
<p>The PDF includes a summary in English.</p>