Bioenergy legislation and energy prices have the potential to generate high demand for bioenergy crops. Large-scale deployment of bioenergy crops promises to have major ecological consequences ranging from alteration in element cycling to provision of ecosystem services. While many of these consequences will be likely complex and scale-dependent, there is a need and opportunity to anticipate many of them in terms of their direction and magnitude through the application of ecological modeling principles and tools. The goal of this oral session is to present advances in the ecological modeling of bioenergy production and environmental impacts at different spatial scales, from landscapes to large regions. The objective of this oral session is to present and discuss advances in ecological modeling of bioenergy production and their environmental impacts with respect to a) short and long-term production of bioenergy feedstocks; b) carbon, nutrient, and water balances; c) net greenhouse gas balance, d) land-use change; and e) landscape biodiversity. Talks will be of interest to the whole ESA membership because they will integrate results of ecological modeling research, field experiments and geographical analysis.