The aim of this research is to predict the impact of the future climate change on the flora, in particular forest flora. In a first, observational part the relationship between plant species, communities and functional groups on the one hand, and climatic variables on the other hand will be investigated. With this models we can make predictions about different scenarios of climate change. In a second, experimental part we study the phenotypic plasticity of plant species under a simulated climate change, using controlled transplant experiments and/or in situ heating of plots. In both cases phenological aspects, survival, mortality and reproduction are measured to investigate the adaptation capacities of plant species.