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Monoterpene emissions from soil in a Sitka spruce forest.

Haywood, S. and Muncy, R. and James, A. E. and Halsall, Crispin J. and Hewitt, C. Nicholas (2001) Monoterpene emissions from soil in a Sitka spruce forest. Atmospheric Environment, 35 (24). pp. 4081-4087. ISSN 1352-2310

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Abstract

A dynamic soil enclosure was used to characterise monoterpene emissions from 3 soil depths within a Picea sitchensis (Sitka spruce) forest. In addition, a dynamic branch enclosure was used to provide comparative emissions data from foliage. In all cases, limonene and α-pinene dominated monoterpene soil emissions, whilst camphene, β-pinene and myrcene were also present in significant quantities. α-Phellandrene, 3-carene and α-terpinene were occasionally emitted in quantifiable amounts whilst cymene and cineole, although tentatively identified, were always non-quantifiable. Total daily mean monoterpene emission rates, normalised to 30°C, varied considerably between soil depths from 33.6 μg m−2 h−1 (range 28.3–38.4) for undisturbed soil, to 13.0 μg m−2 h−1 (8.97–16.4) with uppermost layer removed, to 199 μg m−2 h−1 (157–216) with partially decayed layer removed, suggesting that the surface needle litter was the most likely source of soil emissions to the atmosphere. Relative monoterpene ratios did not vary significantly between layers. Foliar monoterpenes exhibited a similar emission profile to soils with the exceptions of camphene and 3-carene whose contributions decreased and increased, respectively. Emission rates from foliage, normalised to 30°C were found to have a daily mean of 625 ng g−1 dw h−1 (299–1360). On a land area basis however, total soil emissions were demonstrated to be relatively insignificant to total emissions from the forest ecosystem.

Item Type: Article
Journal or Publication Title: Atmospheric Environment
Uncontrolled Keywords: Picea sitchensis ; Needle litter ; Soil emissions ; Temperature dependence
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21541
Deposited By: ep_ss_importer
Deposited On: 20 Jan 2009 15:24
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:48
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21541

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