Table 1.

Comparison of the mean % abundance of VOC families and abundance of metabolites across all samples between the two seasons in two temperatures (t) and the cut size (c) experiments (Kruskal Wallis).

VOC classesa	2013t	2014t	P value	2013c	2014c	P value
Acetate esters	50.22 ± 3.81	49.02 ± 8.62	n.s.	36.99 ± 2.47	62.71 ± 14.3	***
Acids	0.313 ± 0.562	1.38 ± 0.850	***	0.150 ± 0.274	1.540 ± 1.43	***
Alcohols	0.110 ± 0.046	0.206 ± 0.166	**	9.25 ± 2.54	0.116 ± 0.078	***
Aldehydes	0.014 ± 0.013	0.037 ± 0.034	**	0.008 ± 0.010	0.018 ± 0.033	ns
Alkanes	0	0.008 ± 0.010	n.a.	0	0.002 ± 0.008	n.a.
Amines	0.018 ± 0.035	0.022 ± 0.046	n.s.	0	0	n.a.
Anhydrides	2.23 ± 3.49	1.092 ± 1.917	n.s.	2.298 ± 2.37	2.345 ± 3.15	n.s.
Aromatic compounds	0.0103 ± 0.010	0.004 ± 0.002	**	0.005 ± 0.004	0.005 ± 0.003	n.s.
Nitriles	0	0.001 ± 0.005	n.a.	0	0.002 ± 0.005	n.a.
Non-acetate esters	35.14 ± 2.90	35.24 ± 6.56	n.s.	38.03 ± 2.43	22.30 ± 7.02	***
Oxirane	11.6 ± 2.55	2.594 ± 2.11	***	5.991 ± 2.30	2.608 ± 2.03	***
Sulphur compounds	0.265 ± 0.52	0.215 ± 0.159	n.s.	0.206 ± 0.37	0.026 ± 0.024	*
Terpenes	0.039 ± 0.025	0.010 ± 0.007	***	0.021 ± 0.016	0.008 ± 0.008	**
Total esters	85.36 ± 3.53	84.26 ± 5.26	n.s.	75.02 ± 2.12	85.02 ± 8.88	***
Metabolites b
Total sugars	49.69 ± 9.61	59.53 ± 16.15	*	56.10 ± 14.87	73.79 ± 26.88	*
Reducing sugars	14.33 ± 1.27	23.38 ± 4.04	***	20.08 ± 8.40	22.06 ± 4.61	n.s.
Sucrose	29.74 ± 8.26	44.97 ± 12.41	***	28.65 ± 7.25	53.38 ± 5.82	***
TBARS	4.04 ± 1.09	3.73 ± 0.79	n.s.	3.35 ± 1.35	3.80 ± 0.82	n.s.

^aMean relative % abundance of VOC class as a ratio of total VOC area across all samples.

^bMean abundance as mg/g FW.