Table 2.

(a) Effects of light treatment (b) moisture treatment, collection year, and population on physiological traits in introduced Polygonum cespitosum

Physiological trait	Source of variation
	Light treatment	Year	Population	Treatment × Year	Treatment × Population	Year × Population	Treatment × Year × Population
(a)
Photosynthetic rate	0.001***	0.842	0.073†	0.051†	0.417	0.141	0.613
r2 = 0.724; N = 62
Stomatal conductance	0.001***	0.778	0.363	0.005**	0.537	0.044*	0.672
r2 = 0.496; N = 62
Water use efficiency	0.001***	0.241	0.956	0.001***	0.678	0.082†	0.944
r2 = 0.754; N = 62

Physiological trait	Source of variation
	Moisture treatment	Year	Population	Treatment × Year	Treatment × Population	Year × Population	Treatment × Year × Population
(b)
Photosynthetic rate	0.001***	0.462	0.148	0.025*	0.616	0.039*	0.002**
r2 = 0.617; N = 53
Stomatal conductance	0.036*	0.846	0.203	0.12	0.579	0.371	0.182
r2 = 0.288; N = 53
Water use efficiency	0.001***	0.743	0.606	0.364	0.46	0.759	0.298
r2 = 0.495; N = 53

P-values are shown from full anova (see Materials and methods).

Statistical significance is indicated as: †P ≤ 0.10; *P < 0.05; **P < 0.01; ***P < 0.001.