Table 3.

Analysis of covariance testing for response of the percent reservoir D₂O taken up by receiver seedlings to mesh treatments and [CO₂] (ppm), after adjustment for δ¹⁸O of donor seedling xylem water, δ¹⁸O of receiver seedling xylem water, percent reservoir water taken up by donor seedlings, labeling period, and run

ANCOVA: AIC = 11.8
Effect	Coefficient	F-value	P> F
Mesh	N/A	563.8	0.0298
[CO2]	N/A	74.33	0.0735
Mesh × [CO2]	N/A	140.37	0.0596
Covariates
Donor δ18O (‰)	-	208.91	0.044
Donor % reservoir uptake	-	76.73	0.0724
Receiver δ18O (‰)	+	1143.67	0.0188
Labeling period (days)	+	149.42	0.052

Note. The coefficient signs are only given for continuous variables.