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| Titel |
An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem |
| VerfasserIn |
S. Mereu, E. Salvatori, L. Fusaro, G. Gerosa, B. Muys, F. Manes |
| 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. 11 ; Nr. 6, no. 11 (2009-11-17), S.2599-2610 |
| Datensatznummer |
250004095
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| Publikation (Nr.) |
 copernicus.org/bg-6-2599-2009.pdf |
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| Zusammenfassung |
| An integrated approach has been used to analyse the dependence of three
Mediterranean species, A. unedo L., Q. ilex L., and
P. latifolia L. co-occurring in a coastal dune ecosystem on two
different water resources: groundwater and rainfed upper soil layers. The
approach included leaf level gas exchanges, sap flow measurements and
structural adaptations between 15 May and 31 July 2007. During this period it
was possible to capture different species-specific response patterns to an
environment characterized by a sandy soil, with a low water retention
capacity, and the presence of a water table. The latter did not completely
prevent the development of a drought response and, combined with previous
studies in the same area, response differences between species have been
partially attributed to different root distributions. Sap flow of
A. unedo decreased rapidly with the decline of soil water content,
while that of Q. ilex decreased only moderately. Midday leaf water
potential of P. latifolia and A. unedo ranged between
−2.2 and −2.7 MPa throughout the measuring period, while in
Q. ilex it decreased down to −3.4 MPa at the end of the season.
A. unedo was the only species that responded to drought with a
decrease of its leaf area to sapwood area ratio from 23.9±1.2 (May) to
15.2±1.5 (July). While A. unedo also underwent an almost
stepwise loss on hydraulic conductivity, such a loss did not occur for
Q. ilex, whereas P. latifolia was able to slightly increase
its hydraulic conducitivity. These differences show how different plant
compartments coordinate differently between species in their responses to
drought. The different responses appear to be mediated by different root
distributions of the species and their relative resistances to drought are
likely to depend on the duration of the periods in which water remains
extractable in the upper soil layers. |
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