| Abstract: | Eighteen poplar (Populus) clones, varying in growth capacitywere grown in plastic containers under outdoor conditions. Duringthe first year of growth their net CO2 exchange rate (NCER)was studied by infra-red gas analysis as a function of photosyntheticphoton flux density (PPFD) under controlled environment conditions.Maximal NCER (under saturating PPFD) and the PPFD compensationpoint were significantly correlated with the first year's shootlength and hence with the above ground biomass production ofthe various clones. Key words: Poplar, Shoot growth, CO2 exchange rate |
