My research program uses a variety of techniques to investigate the biological and physical controls over the exchange of trace gases and energy between plants and the atmosphere. This research emphasizes the response of terrestrial ecosystems to environmental changes including climate change, disturbance, and herbivory. The techniques we use borrow from a range of disciplines including micrometeorology, plant physiology, community ecology, ecosystem ecology, and biogeochemistry.We are currently using networks of eddy covariance towers to explore linkages between ecosystem structure and function in the context of ecological disturbance and climate change.