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Eddy flux and leaf-level measurements of biogenic VOC emissions from Mopane woodlands of Botswana.

Greenberg, J. and Guenther, A. and Harley, P. and Otter, L. and Veenendahl, E. and Hewitt, CN and James, A. and Owen, S. M. (2003) Eddy flux and leaf-level measurements of biogenic VOC emissions from Mopane woodlands of Botswana. Journal of Geophysical Research: Atmospheres, 108 (D13). pp. 8466-8474. ISSN 0747-7309

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Abstract

Biogenic volatile organic compound (BVOC) emissions were measured in a mopane woodland near Maun, Botswana in January–February 2001 as part of SAFARI 2000. This landscape is comprised of more than 95% of one woody plant species, Colophospermum mopane (Caesalpinaceae). Mopane woodlands extend over a broad area of southern Africa. A leaf cuvette technique was used to determine the emission capacities of the major vegetation and the temperature and light dependence of the emissions. In addition, relaxed eddy accumulation (REA) measurements of BVOC fluxes were made on a flux tower, where net CO2 emissions were also measured simultaneously. Large light-dependent emissions of terpenes (mostly α-pinene and d-limonene) were observed from the mopane woodland. The diurnal BVOC emissions were integrated and compared with the CO2 flux. Monoterpene flux exceeded 3000 μg C m−2 h−1 during the daytime period, comparable to isoprene fluxes and much higher than terpene fluxes measured in most areas. The terpene flux constituted approximately 25% of the diurnal net carbon exchange (CO2) during the experimental period. Other BVOC emissions may also contribute to the carbon exchange.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research: Atmospheres
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21390
Deposited By: ep_ss_importer
Deposited On: 13 Jan 2009 09:48
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21390

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