Mean predawn leaf water potentials (Ψpd) and number of days to different levels of Ψpd increases of plains cottonwood trees at three study sites over two years after the addition of water to the canalz along the High Line Canal, Denver, Colorado, U.S. (2002–2003). SE = standard error.
| Year | Site | Trees | Days of waterz | Mean water potential (MPa) before water added (SE) | Mean water potential (MPa) after water added (SE) | Days to >−0.10 MPa | Days to highest water potential | Days to decrease back to <−0.30 MPa |
|---|---|---|---|---|---|---|---|---|
| 2002 | 2 | 5 | 4 | −0.67 (−0.13) | −0.38 (−0.07) | 1 | 7 | 8 |
| 19 | 3 | 4 | −1.00 (−0.23) | −0.55 (−0.11) | 1 | 9 | 14 | |
| 2003 | 2 | 5 | 10 | −0.40 (−0.08) | −0.25 (−0.03) | 3 | 5 | 36 |
| 17 | 3 | 10 | −0.31 (−0.07) | −0.22 (−0.04) | 3 | 5 | 28 | |
| 6 | 5 | 4 | −0.38 (−0.06 | −0.27 (−0.04) | 2 | 3 | 17 | |
| Mean | −0.55 (−0.11) | −0.33 (−0.06) | 2 | 5.8 | 20.6 |
↵z Water source for basin in canal was a water truck or fire hydrant.