Table 3.

Correlations (r²) between different volatile compound families (Table 1) in the amount of biogenic volatile organic compounds (BVOCs) emitted during seven minutes after leaf mechanical wounding by razor cuts and punch holes in Populus tremula

	Pentenyl family	Hexanal family	Hexenal family	Benzenoids and jasmonates	Induced isoprenoids	Total BVOC emission
Lightweight oxygenated compounds	0.705***	0.642***	0.682***	0.073*	0.0075	0.872***
Pentenyl family		0.878***	0.969***	0.187***	0.059*	0.938***
Hexanal family			0.765***	0.164***	0.033	0.781***
Hexenal family				0.156***	0.053	0.947***
Benzenoids and jasmonates					0.383***	0.131**
Induced isoprenoids						0.033

Relationships based on 70 observations.

Asterisks denote the statistical significance: (*) P<0.05; (**) P<0.01; (***) P<0.001