Volatile and semi-volatile terpenes impact leaf flammability: differences according to the level of terpene identification

In flammability assessment, the terpene effect is usually studied using their total or subgroup content, missing, therefore, information that could be provided by molecules themselves. this study, specific role of terpenes on leaf was sought comparing different levels identification—total, (i.e. mono-, sesqui-, and diterpene), single compound—as well as interactions with fuel moisture content (FMC) in four species common Mediterranean Wildland–Urban Interfaces (Pinus halepensis, Cupressocyparis leylandii, Hesperocyparis arizonica, Cupressus sempervirens). Pinus halepensis most flammable (low FMC higher sesquiterpene but low diversity) while leylandii presented highest diversity (higher mono- diterpene content). Flammability differently affected according to identification level used models. The effects ranged from non-significant for studied, mostly significant, compound content. Regarding former, lack significant results due opposite compounds within a subgroup. For latter, driving (positive negative) differed among species. A cumulative also highlighted some cases remained main drivers regardless Using refined modelling allowed better understanding compounds’ flammability, which useful plant traits linked flammability.