Results of mixed forest prognosis with use of the FORKOME model on the area of the 135g division of the Kampinoski Forest Department are presented in this research work. 600 hundred years of future possible tree amount and biomass changes are described. The research includes control scenario simulating Pinus sylvestris biomass decreasing and Quercus robur biomass increasing up to reaching the domination level. Scenario 1 (warm and humid) simulates Quercus robur and Tilia cordata biomass decreasing and increasing of Quercus petrea biomass. Scenario 2 (warm and dry) Quercus petraea biomass reaches lower level than in scenario 1 however, slightly higher in the middle of the simulation than in the control scenario. In scenario 3 (cold and humid) FORKOME simulates considerable domination of Pinus sylvestris especially during the first half of the prognosis. Scenario 4 (cold and dry) simulates Tilia cordata and Acer platanoides biomass increasing in the second half of the prognosis. Preceding FORKOME simulations allows ascertaining that forest succession computer research is helpful in estimating climatic changes influence on forest ecosystems. The results clearly state that FORKOME model is very useful for that kind of research.

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