Photosynthese, Transpiration und Spaltöffnungsverhalten verschiedener Holzarten nach Begasung mit SO2

Photosynthesis, transpiration and stomatal response of various species of woody plants exposed to sulfur dioxide. Photosynthesis of Fraxinus excelsior, Piceaabies, Abies alba and Pinus sylvestris declined after 6 and 12 h of fumigation at SO2 concentrations of 5 and 9mg m−3. Transpiration also declined, but the maximum depression was only 38%. Stomata began to close after fumigation with ∼ 1 mg SO2m−3 for 6 h. The diffusion resistance of needles of Pices and Abies increased after fumigation with 9 mg SO2 for 6h to a peak value of 35–40 scm−1 and decreased rapidly (Picea) or remained stable (Abies) during the following 30h.