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| Titel |
The ACCENT-VOCBAS field campaign on biosphere-atmosphere interactions in a Mediterranean ecosystem of Castelporziano (Rome): site characteristics, climatic and meteorological conditions, and eco-physiology of vegetation |
| VerfasserIn |
S. Fares, S. Mereu, G. Scarascia Mugnozza, M. Vitale, F. Manes, M. Frattoni, P. Ciccioli, G. Gerosa, F. Loreto |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 6 ; Nr. 6, no. 6 (2009-06-18), S.1043-1058 |
| Datensatznummer |
250003838
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| Publikation (Nr.) |
 copernicus.org/bg-6-1043-2009.pdf |
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| Zusammenfassung |
| Biosphere-atmosphere interactions were investigated on a
sandy dune Mediterranean ecosystem in a field campaign held in 2007 within
the frame of the European Projects ACCENT and VOCBAS. The campaign was
carried out in the Presidential estate of Castelporziano, a peri-urban park
close to Rome. Former campaigns (e.g. BEMA) performed in Castelporziano
investigated the emission of biogenic volatile organic compounds (BVOC).
These campaigns focused on pseudosteppe and evergreen oak groves whereas the
contribution of the largely biodiverse dune vegetation, a prominent
component of the Mediterranean ecosystem, was overlooked. While specific
aspects of the campaign will be discussed in companion papers, the general
climatic and physiological aspects are presented here, together with
information regarding BVOC emission from the most common plant species of
the dune ecosystem. During the campaign regular air movements were observed,
dominated by moderate nocturnal land breeze and diurnal sea breeze. A
regular daily increase of ozone concentration in the air was also observed,
but daily peaks of ozone were lower than those measured in summer on the
same site. The site was ideal as a natural photochemical reactor to observe
reaction, transport and deposition processes occurring in the Mediterranean
basin, since the sea-land breeze circulation allowed a strong mixing between
biogenic and anthropogenic emissions and secondary pollutants. Measurements
were run in May, when plant physiological conditions were optimal, in
absence of severe drought and heat stress. Foliar rates of photosynthesis
and transpiration were as high as generally recorded in unstressed
Mediterranean sclerophyllous plants. Most of the plant species emitted high
level of monoterpenes, despite measurements being made in a period in which
emissions of volatile isoprenoids could be restrained by developmental and
environmental factors, such as leaf age and relatively low air temperature.
Emission of isoprene was generally low. Accounting for the high monoterpene
spring emission of the dune ecosystem may be important to correct algorithms
at regional and ecosystem levels, and to interpret measurements of fluxes of
volatile isoprenoids and secondary pollutants. |
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