 |
| Titel |
Terpenoid emissions from fully grown east Siberian Larix cajanderi trees |
| VerfasserIn |
M. K. Kajos, H. Hakola, T. Holst, T. Nieminen, V. Tarvainen, T. Maximov, T. Petäjä, A. Arneth, J. Rinne |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-15), S.4705-4719 |
| Datensatznummer |
250018339
|
| Publikation (Nr.) |
 copernicus.org/bg-10-4705-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| While emissions of many biogenic volatile organic compounds (BVOCs), such as
terpenoids, have been studied quite intensively in North American and
Scandinavian boreal forests, the vast Siberian boreal forests have remained
largely unexplored by experimental emission studies. In this study the shoot-scale
terpenoid emission rates from two mature Larix cajanderi trees growing in their
natural habitat in eastern Siberia were measured at the Spasskaya Pad flux
measurement site (62°15´18.4" N, 129°37´07.9" E) located on the
western bank of the Lena river. The measurements were conducted during three
campaigns: 3–24 June, 8–26 July, and 14–30 August, in the summer
of 2009. A dynamic flow-through enclosure technique was applied for adsorbent
sampling, and the samples were analysed offline with a gas chromatograph.
Between 29 and 45 samples were taken from each shoot during all three
campaigns. Seven different monoterpenes, six different sesquiterpenes,
linalool isoprene, and 2-methyl-3-buten-2-ol (MBO) were identified. The
monthly median value of the total terpenoid emissions varied between 0.006
and 10.6 μg gdw−1 h−1. The emissions were dominated by
monoterpenes, which constituted between 61 and 92% of the total
emissions. About half of the monoterpene emissions were comprised of Δ
3-carene; α- and β-pinene had significant emissions as
well. Linalool emissions were also substantial, comprising 3–37% of the total
emissions, especially in June. Sesquiterpenes accounted for less than 3%
and isoprene less than 1% of the total emissions. Based on the measured
emission rates, the relative atmospheric concentration of each compound was
estimated. Monoterpenes were the species with the highest relative
concentration, while linalool and sesquiterpenes had a notably smaller
contribution to the estimated atmospheric concentration than to the emission
rates. A temperature-dependent pool algorithm with a constant β (0.09 °C−1 for monoterpenes and 0.143 °C−1 for
sesquiterpenes) was used to normalize the measured emission data. For
monoterpenes the emission potential varied between 0.5 and 18.5 μg gdw−1 h−1
and for sesquiterpenes between 0.02 and 0.4 μg gdw−1 h−1. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|