Table 1. Effects of plant diversity on metabolite composition based on GC-TOF-MS and LC-FT-MS data.

		PCA axis 1			PCA axis 2			PCA axis 3
Bellis perennis	df	MS	F	p	MS	F	p	MS	F	p
Block	3	0.459	1.02	0.494	0.385	0.19	0.896	2.222	4.06	0.140
Species richness	1	6.269	13.93	0.034	1.318	0.65	0.478	0.007	0.01	0.915
Legume proportion	1	0.006	0.01	0.917	0.488	0.24	0.656	0.689	1.26	0.344
Residuals	3	0.450			2.013			0.547
Knautia arvensis	df	MS	F	p	MS	F	p	MS	F	p
Block	3	0.222	0.22	0.878	0.468	0.41	0.751	0.393	0.67	0.598
Species richness	1	2.534	2.54	0.155	3.509	3.08	0.123	3.731	6.34	0.040
Legume proportion	1	2.827	2.84	0.136	0.118	0.10	0.757	3.918	6.75	0.036
Residuals	7	0.996			1.139			0.588
Lotus corniculatus	df	MS	F	p	MS	F	p	MS	F	p
Block	3	0.733	1.34	0.322	0.841	0.74	0.553	0.650	0.45	0.722
Species richness	1	0.203	0.37	0.558	1.288	1.14	0.314	0.117	0.08	0.782
Legume proportion	1	7.661	13.96	0.005	0.999	0.88	0.372	0.001	0.00	0.979
Residuals	9	0.549			1.132			1.437
Medicago x varia	df	MS	F	p	MS	F	p	MS	F	p
Block	3	0.414	0.50	0.696	0.819	0.73	0.572	1.867	4.23	0.063
Species richness	1	4.118	4.98	0.067	0.398	0.35	0.574	0.414	0.94	0.370
Legume proportion	1	1.675	2.02	0.205	2.377	2.11	0.197	3.337	7.56	0.033
Residuals	6	0.828			1.128			0.442

Summary of analyses of variance (ANOVA) on the sample scores of the two leading axes of a standardized principal components analysis (PCA) of GC-TOF-MS and LC-FT-MS data (Fig. S1 and S2). Block identity, sown species richness (as log-linear term) and legume proportions (ranging from 0 when legumes were absent to 1 for pure legume communities) were fitted sequentially (type I sums of squares). Abbreviations are: df = degrees of freedom, MS = mean squares, F = F values, p = p values; significant effects are given in bold.