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This seminar report summarizes ecosystem projects in forest damage research. Subject group 1 (model theory approaches) focuses on models which use statistical methods to detect and cover natural processes, and which simulate natural processes in a predefined mathematical model. Subject group 2 concerns stress analyses and substance balances of forest ecosystems; the papers also deal with emission inputs as stress factors in terrestrial ecosystems, with means and methods to reduce their adverse effects, and with the distribution of trace substances (heavy metals) in forest ecosystems. Subject group 3 comprises papers on aspects of pollutant action and on consecutive results of ecosystem stresses (e.g. combination effects of heavy metals and acidic soils on beech regeneration and restocking, changes in species spectra under the influence of emission inputs and their results). 20 papers of this seminar report were abstracted for separate entry into the data base. (ERA citation 14:006497)