Response of the ratio of intercellular CO2 concentration to ambient CO2 concentration (Ci/Ca-ratio) to basic microclimatological factors in an oak-hornbeam forest.

The C i /C a -ratio relations to basic microclimatological factors were estimated in an oak-hornbeam forest on leaves of two tree species (Quercus cerris L., carpinus betulus L.) and two acclimation leaf types (sun and shade leaves). The C i /C a values were rather conservative during daylight period for both leaf types and tree species