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18263.0 [No comment] 25.03.2011 08:06 Released

ID: 18263.0, MPI für Chemie / Publikationen MPI für Chemie
Impact of drought on seasonal monoterpene emissions from Quercus ilex in southern France
Authors:Staudt, M.; Rambal, S.; Joffre, R.; Kesselmeier, J.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Journal of Geophysical Research
Journal Abbrev.:J. Geophys. Res.
Issue / Number:D21
Sequence Number of Article:4602
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We studied monoterpene emissions from the evergreen oak Quercus ilex exposed to different levels of summer drought to examine the seasonal variation of emissions in the Mediterranean area and to test the role of water limitations therein. Measurements were made in seven campaigns between June and January on intact leaves of mature trees growing in two adjacent sites, in one of which the natural water supply was reduced by a ground roof. In both sites, actual emission rates as well as light- and temperature-normalized emission rates (i.e., emission factor (EF)) significantly changed during the seasons: Mean EFs increased from June to July to a broad summer maximum between 5.2 and 9.4 nmol m(-2) leaf area s(-1) (12- 21 mug g(-1) leaf dry mass h(-1)), dropped in October and November and reached a minimum of about 0.77 nmol m(-2) s(-1) (1.7 mug g(-1) h(-1))in January. From June to July, mean EFs of the trees with reduced water supply were significantly lower than those of trees with normal water supply. The lowered EF in summer was paralleled by lower predawn water potentials, leaf transpiration, photosynthesis and stomatal conductance with respect to control trees. The results suggest that in natural Q. ilex habitats the seasonal evolution of EF follows a marked summer-winter cycle whose shape and intensity can be modified by summer drought.
Free Keywords:volatile organic compounds (VOC); biogenic emissions; monoterpenes; seasonal variation; water stress; emission modeling
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie/Biogeochemie
External Affiliations:CNRS, Ctr Ecol Fonct & Evolut, 1919 Route Mende, F-34293 Montpellier 5, France