An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem

An integrated approach has been used to analyse the dependence of three Mediterranean species, <i>A. unedo</i> L., <i>Q. ilex</i> L., and <i>P. latifolia</i> L. co-occurring in a coastal dune ecosystem on two differe...

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Main Authors: F. Manes, B. Muys, G. Gerosa, L. Fusaro, E. Salvatori, S. Mereu
Format: Article
Language:English
Published: Copernicus Publications 2009-11-01
Series:Biogeosciences
Online Access:http://www.biogeosciences.net/6/2599/2009/bg-6-2599-2009.pdf
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spelling doaj-62a590af967f49d0a5e6112b9ce4f6b02020-11-24T21:03:49ZengCopernicus PublicationsBiogeosciences1726-41701726-41892009-11-0161125992610An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystemF. ManesB. MuysG. GerosaL. FusaroE. SalvatoriS. MereuAn integrated approach has been used to analyse the dependence of three Mediterranean species, <i>A. unedo</i> L., <i>Q. ilex</i> L., and <i>P. latifolia</i> 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 <i>A. unedo</i> decreased rapidly with the decline of soil water content, while that of <i>Q. ilex</i> decreased only moderately. Midday leaf water potential of <i>P. latifolia</i> and <i>A. unedo</i> ranged between −2.2 and −2.7 MPa throughout the measuring period, while in <i>Q. ilex</i> it decreased down to −3.4 MPa at the end of the season. <i>A. unedo</i> 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 <i>A. unedo</i> also underwent an almost stepwise loss on hydraulic conductivity, such a loss did not occur for <i>Q. ilex</i>, whereas <i>P. latifolia</i> 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. http://www.biogeosciences.net/6/2599/2009/bg-6-2599-2009.pdf
collection DOAJ
language English
format Article
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author F. Manes
B. Muys
G. Gerosa
L. Fusaro
E. Salvatori
S. Mereu
spellingShingle F. Manes
B. Muys
G. Gerosa
L. Fusaro
E. Salvatori
S. Mereu
An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
Biogeosciences
author_facet F. Manes
B. Muys
G. Gerosa
L. Fusaro
E. Salvatori
S. Mereu
author_sort F. Manes
title An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
title_short An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
title_full An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
title_fullStr An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
title_full_unstemmed An integrated approach shows different use of water resources from Mediterranean maquis species in a coastal dune ecosystem
title_sort integrated approach shows different use of water resources from mediterranean maquis species in a coastal dune ecosystem
publisher Copernicus Publications
series Biogeosciences
issn 1726-4170
1726-4189
publishDate 2009-11-01
description An integrated approach has been used to analyse the dependence of three Mediterranean species, <i>A. unedo</i> L., <i>Q. ilex</i> L., and <i>P. latifolia</i> 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 <i>A. unedo</i> decreased rapidly with the decline of soil water content, while that of <i>Q. ilex</i> decreased only moderately. Midday leaf water potential of <i>P. latifolia</i> and <i>A. unedo</i> ranged between −2.2 and −2.7 MPa throughout the measuring period, while in <i>Q. ilex</i> it decreased down to −3.4 MPa at the end of the season. <i>A. unedo</i> 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 <i>A. unedo</i> also underwent an almost stepwise loss on hydraulic conductivity, such a loss did not occur for <i>Q. ilex</i>, whereas <i>P. latifolia</i> 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.
url http://www.biogeosciences.net/6/2599/2009/bg-6-2599-2009.pdf
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