caa a22 4500 475823524 CHVBK 20180406123825.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1023/A:1006233010748 doi (NATIONALLICENCE)springer-10.1023/A:1006233010748 Seasonal Variation in Amount and Composition of Monoterpenes Emitted by Young Pinus pinea Trees - Implications for Emission Modeling [Elektronische Daten] [M. Staudt, N. Bertin, B. Frenzel, G. Seufert] Current inventories of terpenes released from vegetation consider only the short-term influences of light and temperature on emissions to simulate temporal variation during the year. We studied whole canopy emissions from young Pinus pinea during a 15-month enclosure in greenhouse chambers and examined data for other long-term influences. Mean daytime emission rates strongly increased during spring, reached an annual maximum of ≈ 200 pmol m−2 total needle area s−1 (1.1 μg g−1 leaf dry weight h−1) between mid June and mid August, strongly declined in fall and reached an annual minimum of ≈ 1 pmol m−2 s−1 (0.006 μg g−1 h−1) between January and February. Normalization to standard temperature and light conditions did not change the annual time course of emissions, but reduced summer to winter ratio from a factor of 200 to about 45. Seasonal variation was characterized also by changes in terpene composition: among the six main compounds, three (t-β-ocimene, linalool, 1.8-cineol) were exclusively emitted during sunlit hours in the main vegetation period, whereas the other (limonene, α-pinene, myrcene) were emitted day and night and throughout the seasons. The results suggest that different terpene sources in P. pinea foliage exist and that a great part of the annual emission course observed here results from seasonal influences on these sources. A global model to simulate plant emissions is proposed, which accounts for seasonal influences on emissions in addition to the short-term effects of temperature and light. The model is tested on field data and discussed for its general application. Kluwer Academic Publishers, 2000 monoterpene emission nationallicence Mediterranean pine nationallicence seasonal variation nationallicence light nationallicence temperature nationallicence algorithms nationallicence model nationallicence Staudt M. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut Bertin N. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut Frenzel B. Institute for Botany, Univ. Hohenheim, 70593, Stuttgart, Germany aut Seufert G. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut Journal of Atmospheric Chemistry Kluwer Academic Publishers 35/1(2000-01-01), 77-99 0167-7764 35:1<77 2000 35 10874 https://doi.org/10.1023/A:1006233010748 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1006233010748 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Staudt M. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut NATIONALLICENCE 700 1- Bertin N. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut NATIONALLICENCE 700 1- Frenzel B. Institute for Botany, Univ. Hohenheim, 70593, Stuttgart, Germany aut NATIONALLICENCE 700 1- Seufert G. Environment Institute, JRC-Ispra, 21020, Ispra, Italy aut NATIONALLICENCE 773 0- Journal of Atmospheric Chemistry Kluwer Academic Publishers 35/1(2000-01-01), 77-99 0167-7764 35:1<77 2000 35 10874 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer