Photosynthetic acclimation of overstory Populus tremuloides and understory Acer saccharum to elevated atmospheric CO₂ concentration: interactions with shade and soil nitrogen

Abstract

We exposed Populus tremuloides Michx. and Acer saccharum Marsh. to a factorial combination of ambient and elevated atmospheric CO₂ concentrations ([CO₂]) and high-nitrogen (N) and low-N soil treatments in open-top chambers for 3 years. Our objective was to compare photosynthetic acclimation to elevated [CO₂] between species of contrasting shade tolerance, and to determine if soil N or shading modify the acclimation response. Sun and shade leaf responses to elevated [CO₂] and soil N were compared between upper and lower canopy leaves of P. tremuloides and between A. saccharum seedlings grown with and without shading by

Citation

Kubiske, Mark E.; Zak, Donald R.; Pregitzer, Kurt S.; Takeuchi, Yu. 2002. Photosynthetic acclimation of overstory Populus tremuloides and understory Acer saccharum to elevated atmospheric CO₂ concentration: interactions with shade and soil nitrogen. Tree Physiology. 22: 321-329.