3.5 Relationship between zones, sapwood area, dbh, and tree-level transpiration
Mean daily transpiration in the monitored trees ranged from 10 to 93 L day-1 in 2015 and 9 to 122 L day-1in 2016 (Figure 3). Mean dbh ranged from 14 to 40 cm, sapwood area ranged from 132 to 1000 cm2, and both were linearly related to transpiration in all zones in 2015 and 2016. The slope coefficients between zones were not significantly different (Figure 3). When dbh and sapwood area were small (< 20 and < 400 cm2, respectively), daily transpiration ranged from 9 to 45 L day-1. For trees with larger sapwood area (800 to 1000 cm2), daily transpiration ranged from 72 to 122 L day-1.