The observed temperature increase in a changing climate in Austria is twice as much as the global average and the range of the variability of precipitation is increasing as well. Forest tree species will, due to their specific ecophysiological limitations, react sensitive on an individual basis towards changing climate conditions. The objectives of this thesis were (1) to investigate the climate sensitivity of the ten most common forest tree species in Austria at their current distribution, and determine the relative roles of temperature and precipitation in overall climate sensitivity, (2) to identify the species most at risk at their current locations, (3) to indicate and quantify spatial hotspots of the risk of species loss, and (4) to quantify how species diversity and eveness is contributing to the mitigation of climate change sensitivity. A tree species suitability model was applied, which quantifies the physiological limitations of tree species with regard to temperature, water and soil regimes. The sensitivity to different generically defined climate scenarios, developed to reflect a range of different combinations of temperature and precipitation for Austria, was assessed with the model. The analyses addressed climate sensitivity for each species and the risk of species loss at each forest inventory plot, to see where in ecoregions and Elevation belts the greatest risk for species loss might be expected and whether species diversity and evenness mitigate the risk of species loss. The eastern parts of Austria were found to be most sensitive to climate change, especially with regard to changes in precipitation. There were strong differences in risk of species loss between ecoregions and elevation levels, with Norway spruce being the species most at risk. Species diversity and species evenness at plot level had no mitigating effect on species loss. This analysis should help scientists and forest managers to prioritize adaptation strategies in a changing climate.