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Light is an important environmental factor controlling biogenic volatile organic compound (BVOC) emissions, but in natural\udconditions its impact is hard to separate from other influential factors such as temperature. We studied the light response\udof foliar BVOC emissions, photosynthesis and stomatal conductance on three common European tree species, namely English oak\ud(Quercus robur), European beech (Fagus sylvatica) and two provenances of Norway spruce (Picea\udabies) in Taastrup, Denmark. Leaf scale measurements were performed on the lowest positioned branches of the tree in\udJuly 2015. Light intensity was increased in four steps (0, 500, 1000 and 1500 µmol m−2 s−1), whilst\udother chamber conditions such as temperature, humidity and CO2 levels were fixed.\ud \udWhereas the emission rate differed between individuals of the same species, the relative contributions of compounds to the\udtotal isoprenoid emission remained similar. Whilst some compounds were species specific, the compounds α-pinene,\udcamphene, 3-carene, limonene and eucalyptol were emitted by all of the measured tree species. Some compounds, like isoprene\udand sabinene, showed an increasing emission response with increasing light intensity, whereas other compounds, like\udcamphene, had no significant emission response to light for most of the measured trees. English oak and European beech\udshowed high light-dependent emission fractions from isoprene and sabinene, but other emitted compounds were\udlight independent. For the two provenances of Norway spruce, the compounds α-pinene, 3-carene and eucalyptol showed\udhigh light-dependent fractions for many of the measured trees. This study highlights differences between compound emissions\udin their response to a change in light and a possible light independence for certain compounds, which might be valid for\uda wider range of tree species. This information could be of importance when improving emission models and to further\udemphasize the discussion regarding light or temperature dependencies for individual compounds across species

Isoprenoid emission response to changing light conditions of English oak, European beech and Norway spruce