. 2015 Jan 14;10(1):e0116367. doi: 10.1371/journal.pone.0116367

Table 1. Summary of the mixed-effects model testing the effects of species richness, functional group number and functional group identity on xylem water enrichment in ¹⁸O and ²H (i.e., difference between samples taken after the labeling and the background samples).

	April				June				September
	δ¹⁸O		δ²H		δ¹⁸O		δ²H		δ¹⁸O		δ²H
	χ² ratio	P	χ² ratio	P	χ² ratio	P	χ² ratio	P	χ² ratio	P	χ² ratio	P
Species richness (SR, log-linear)	0.71	0.399	0.01	0.931	0.18	0.669	1.82	0.177	3.01	0.083	2.13	0.145
Functional group richness (FR, linear)	0.05	0.825	1.45	0.228	0.26	0.61	0.79	0.373	1.1	0.294	0.14	0.709
Functional group identity (FG)	12.94	0.005	3.79	0.285	6.11	0.106	2.13	0.546	2.62	0.453	5.82	0.121
SR x FG	0.19	0.801	1.6	0.66	2.37	0.499	1.73	0.63	0.85	0.837	2.58	0.461

Analyses were carried out for each campaign separately.

Table 1. Summary of the mixed-effects model testing the effects of species richness, functional group number and functional group identity on xylem water enrichment in 18O and 2H (i.e., difference between samples taken after the labeling and the background samples).