Effects of elevated O3 and CO2 on chlorophyll fluorescence and gas exchange in Scots pine during the third growing season

air pollution arbre forestier carbon dioxide carbon dioxide enrichment chlorophylle chlorophylls clorofilas dioxyde de carbone electron transfer estoma fluorescence fluorescencia forest trees fotosistemas gas exchange intercambio de gases leaf conductance oxidoreductions ozone ozono photosynthese photosynthesis photosystem ii photosystems pinus sylvestris stomata stomatal resistance stomate transpiration