[摘要] The volatile organic compound (VOC) emission rates of Scots pine(
Pinus sylvestris L.) were measured from trees growing in anatural forest environment at two locations in Finland. The observedtotal VOC emission rates varied between 21 and874 ngg
-1 h
-1 and 268 and1670 ngg
-1 h
-1 in southern and northern Finland,respectively. A clear seasonal cycle was detected with high emissionrates in early spring, a decrease of the emissions in late springand early summer, high emissions again in late summer, and a gradualdecrease in autumn.
The main emitted compounds were Δ3-carene (southern Finland)and α- and β-pinene (northern Finland), with approximaterelative contributions of 60–70% and 60–85% of the total observedmonoterpene emission rates, respectively. Sesquiterpene (β-caryophyllene) and 2-methyl-3-buten-2-ol (MBO) emissions were initiated inearly summer at both sites. The observed MBO emission rates were between 1and 3.5% of the total monoterpene emission rates. The sesquiterpeneemission rates varied between 2 and 5% of the total monoterpene emissionrates in southern Finland, but were high (40%) in northern Finland inspring.Most of the measured emission rates were found to be well describedby the temperature dependent emission algorithm. The calculatedstandard emission potentials were high in spring and early summer,decreased somewhat in late summer, and were high again towardsautumn. The experimental coefficient β ranged from 0.025 to0.19 (average 0.10) in southern Finland, with strongest temperaturedependence in spring and weakest in late summer. Only the emissionrates of 1,8-cineole were found to be both light and temperaturedependent.
