ABSTRACT

Plants are living, synthesizing, growing, respiring, and decaying in a fluid that is generally in a state of motion. This air in motion exchanges momentum, heat, gases, and particulates between canopy elements and/or between the canopy layer and the atmosphere. Physical, biological, and chemical processes that control the rate of turbulent transfer are intimately coupled and atmospheric environmental conditions influence biochemical sources and sinks of H2O, CO2, O2, O3, terpenes, and isoprenes.