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.