Biophysical limits to responses of water flux to vapor pressure deficit in seven tree species with contrasting land use regimes

- Isohydric timber trees are less stomatal control compared to anisohydric mature trees.
- Sap flux and water transport for a given diameter decrease with tree age or size.
- Gsref is higher in young timber trees than mature trees.
- The responsiveness of Gs to D is similar under different land use regimes.
- Wood density is a good predictor of Gsref.