Physiologische Reaktionen der Fichte (Picea abies) auf komplexen SO2‐ und Trockenstreß

Physiological reactions of spruce (Picea abies) on complex SO2- and drought-induced stress. Part 3. Responses of SO2-stressed spruces to subsequent drought-induced stress. SO2-stressed spruces under drought-stress showed less reduced water content, less increased osmotical potential and less restricted photosynthesis compared to spruces without preceding SO2-stress and thus seemed to be in a better physiological situation. Their ability to retain water (in cut-off twigs) as well as their ability to withstand a quick and strong water-loss in the needle-tissue without cell-damage were reduced. Reasons for the temporarily favourable effect of a pre-going SO2-stress in surviving a drought-stress are discussed.