Chamber-based system for measuring whole-plant transpiration dynamics.

Most of our insights on whole-plant transpiration are based on leaf-chamber measurements using water vapor porometers, IRGAs, or flux measurements. Gravimetric methods are integrative, accurate, and a clear differentiation between evaporation and can be made. Water vapor pressure deficit (VPD) is the driving force for but assessing its impact has been evasive, due to confounding effects of other climate drivers.