Forest ecosystems grow at the interface between the land and the atmosphere. Understanding the properties of this planetary boundary layer is very important for a number of related disciplines. This book presents an overview of many topics that are of significance at this interface, starting at the scale of intra-leaf organelles, leaves and plants, ranging to higher levels of organization such as communities and ecosystems. It covers topics such as stomatal functioning large-scale processes radiation modelling forest meteorology carbon sequestration. Based on proceedings of a conference to mark the retirement of Professor Paul Jarvis from the University of Edinburgh, the book contains contributions from leading international scientists.