Table 4.

Mean daily transpiration (mL·day⁻¹) for interactions between main treatments of year by compaction treatment and year by species.

	Mean daily transpiration (mL·day⁻¹)
Year by^{^z} / Soil treatment^{^y}		Year by / Species^{^x}
2002		2002
MODERATE-density	66.9 ± 8.3 a	‘Armstrong’	19.0 ± 7.4 b
(n = 14)		(n = 21)
HIGH-density	13.5 ± 6.9 b	‘Brandywine’	43.6 ± 10.4 a
(n = 28)		(n = 21)
2003		2003
MODERATE-density	25.0 ± 6.3 a	‘Armstrong’	11.4 ± 6.1 a
(n = 10)		(n = 15)
HIGH-density	7.8 ± 3.2 b	‘Brandywine’	15.6 ± 2.8 a
(n = 20)		(n = 15)
2004		2004
MODERATE-density	56.9 ± 11.4 a	‘Armstrong’	65.7 ± 4.5 a
(n = 4)		(n = 6)
HIGH-density	54.4 ± 8.1 a	‘Brandywine’	44.8 ± 10.7 b
(n = 8)		(n = 6)

↵^zYear study period was 2002, 2003, and 2004.
↵^yMODERATE = mean bulk density for three-year study of 1.64 g·cm⁻³, HIGH = mean bulk density for the three-year study of 1.77 g·cm⁻³.
↵^xSpecies were Acer × freemanii ‘Armstrong’, Armstrong Freeman maple, and Acer rubrum ‘Brandywine’, Brandywine red maple; sample sizes reflect the total number of trees available for sampling at the end of each year. At the end of 2002, 12 total trees were destructively harvested to determine stem weight and root growth. At the end of 2003, 18 total trees were destructively harvested, and at the end of the study, all remaining trees were harvested (n = 12); Means ± mean standard error followed by different letters indicate a significant difference between soil treatments at P ≤ 0.05 for each year. Differences between species were found only at P ≤ 0.10 (P = 0.06 in 2002, and P = 0.10 in 2004).