scholarly journals Φυτοκοινωνιολογική έρευνα των μεσογειακών οικοσυστημάτων με Erica manipuliflora Salisb. στο Νομό Χαλκιδικής

2020 ◽  
Author(s):  
Χρήστος Δαμιανίδης
Keyword(s):  
Pinus Halepensis ◽  
Pinus Nigra ◽  
Quercus Coccifera ◽  
Quercus Pubescens ◽  
Juniperus Oxycedrus ◽  
Arbutus Unedo ◽  
Phillyrea Latifolia ◽  
Teucrium Chamaedrys ◽  
Erica Arborea

Η Erica manipuliflora Salisb. (σουσούρα) αποτελεί κυρίαρχο είδος θαμνωδών εκτάσεων σε πολλές περιοχές της Ελλάδας. Αναπτύσσεται σε περιοχές με μεσογειακό κλίμα, οι οποίες χαρακτηρίζονται από την έντονη παρουσία ξηρής και θερμής περιόδου. Η Erica manipuliflora είναι ελάχιστα απαιτητικό είδος και μπορεί να εγκατασταθεί σε περιβάλλοντα με ακραίες συνθήκες. Η Χαλκιδική αποτελεί μία περιοχή που το συγκεκριμένο είδος βρίσκει καλή ανάπτυξη και παρόλο που καταλαμβάνει μεγάλες εκτάσεις δεν υπάρχουν πολλές πληροφορίες διαθέσιμες (μόνο αποσπασματικά από εργασίες που επικεντρώνονται στη μελέτη άλλων ειδών π.χ. Pinus halepensis) για τις φυτοκοινωνίες και τη συνοικολογία. Οι εκτάσεις του Νομού Χαλκιδικής με τη συμμετοχή του είδους Erica manipuliflora, το οποίο συμμετέχει σε αυτές είτε ως κυρίαρχο, είτε ως συγκυρίαρχο, μελετήθηκαν φυτοκοινωνιολογικά με τη μέθοδο του Braun-Blanquet (1951, 1964) με σκοπό τον καθορισμό και την περιγραφή των μονάδων βλάστησής τους. Συνολικά διενεργήθηκαν 250 φυτοληψίες [170 της παρούσας έρευνας και 80 προερχόμενες από το Δαμιανίδη (2011), για την ίδια περιοχή]. Έπειτα από αριθμητική επεξεργασία (μέθοδοι αριθμητικής ταξινόμησης και κατάταξης), διακρίθηκαν φυτοκοινωνικές μονάδες, διάφορης ιεραρχικής διαβάθμισης. Κατά την επεξεργασία του φυτοπίνακα διακρίθηκαν 5 ομάδες φυτοληψιών, οι οποίες διαφοροποιούνταν χλωριδικά και οικολογικά. Μετά την τελική επεξεργασία και συνταξινόμηση, οι φυτοκοινωνικές μονάδες που προέκυψαν, είναι δύο κλάσεις, τρεις τάξεις, δύο συνενώσεις, δύο ενώσεις, τρεις κοινότητες, δύο υποενώσεις, δώδεκα παραλλαγές και τέσσερις όψεις. Από τις παραπάνω μονάδες, η Erica manipuliflora-Pinus halepensis κοινότητα δίνεται για πρώτη φορά, με την παρούσα έρευνα. Η συνταξινόμηση των μονάδων βλάστησης δίνεται παρακάτω: ΚΛΑΣΗ: Cisto-Lavanduletea stoechadis Br.-Bl. in Br.-Bl. et al. 1940. TAΞΗ: Lavandulo stoechadis-Hypericetalia olympici Mucina in Mucina et al. 2016. ΣΥΝΕΝΩΣΗ: Hyperico olympici-Cistion cretici (Oberd. 1954) R. Jahn et Bergmeier in Mucina et al. 2009. ΕΝΩΣΗ: Ericetum verticillatae (=manipuliflorae) Oberd. 1954. ΚΛΑΣΗ: Quercetea ilicis Br.-Bl. ex A. Bolòs et O. de Bolòs in A. Bolòs y Vayreda 1950. ΤΑΞΗ: Pinetalia halepensis Biondi, Blasi, Galdenzi, Pesaresi et Vagge in Biondi et al. 2014. ΚΟΙΝΟΤΗΤΑ: Erica manipuliflora-Pinus halepensis. TAΞΗ: Pistacio lentisci-Rhamnetalia alaterni Rivas-Mart. 1975. ΣΥΝΕΝΩΣΗ: Ceratonio-Pistacion lentisci Zohary et Orshan 1959. ΕΝΩΣΗ: Oleo-lentiscetum aegaeicum Krause, Ludwig & Siedel 1963. Παραλλαγή: τυπική Παραλλαγή: υποβαθμισμένη. ΥΠΟΕΝΩΣΗ: Οleο-lentiscetum, quercetοsum cocciferae Barbero et Quézel 1976. Παραλλαγή: τυπική. Παραλλαγή: με Cistus monspeliensisΌψη: με Calicotome villosa. ΥΠΟΕΝΩΣΗ: Oleο-lentiscetum, pinetosum halepensis Barbero & Quézel 1976. Παραλλαγή: τυπική. Παραλλαγή: με Erica arborea. ΚΟΙΝΟΤΗΤΑ: Arbutus unedo-Erica arborea κοινότητα. Παραλλαγή: με Dorycnium graecum-Teucrium chamaedrys subsp. chamaedrys. Παραλλαγή: με Scleranthus perennis subsp. dichotomus-Micropyrum tenellum. ΚΟΙΝΟΤΗΤΑ: Quercus coccifera-Phillyrea latifolia κοινότητα. Παραλλαγή: με Juniperus oxycedrus subsp. deltoides. Όψη: τυπική Όψη: με Quercus pubescens. Όψη: με Linum elegans. Παραλλαγή: με Pinus nigra subsp. nigra. Παραλλαγή: τυπική. Παραλλαγή: με Cistus monspeliensis. Πέρα από τη φυτοκοινωνιολογική έρευνα, για την οικολογική ερμηνεία των φυτοκοινωνικών μονάδων, διεξήχθη εδαφολογική έρευνα μέσω 46 εδαφοτομών. Στα εδαφολογικά δείγματα που συλλέχθηκαν από τις εδαφοτομές πραγματοποιήθηκαν εργαστηριακές αναλύσεις τόσο στο δασικό τάπητα, όσο και στο έδαφος. Για την ενίσχυση της οικολογικής ερμηνείας, εκτός των αποτελεσμάτων της εδαφολογικής και της φυτοκοινωνιολογικής έρευνας, χρησιμοποιήθηκαν και τα δεδομένα του κλίματος της περιοχής έρευνας, καθώς και τα φυσιογραφικά στοιχείων των φυτοληψιών.

scholarly journals Evaluación de la supervivencia y del crecimiento en la reforestación del proyecto piloto de Albatera tras 12 años

2016 ◽  
Vol 3 (2) ◽  
pp. 40-49
Author(s):  
John Molina ◽  
V. Ramón Vallejo ◽  
Alberto Villagrosa
Keyword(s):  
Pinus Halepensis ◽  
Pistacia Lentiscus ◽  
Ceratonia Siliqua ◽  
Quercus Coccifera ◽  
Juniperus Oxycedrus ◽  
Tetraclinis Articulata ◽  
Olea Europea ◽  
Chamaerops Humilis ◽  
Sobre Todo

El presente trabajo consiste en el seguimiento y evaluación de los resultados de la restauración forestal ecológica realizada en la cuenca de Albatera durante los años 2003 y 2004, poniendo énfasis en la supervivencia después del verano de 2014 comparada con la supervivencia registrada en los años anteriores.Para la toma de los datos ha sido necesario desplazarse a la cuenca durante 20 días entre los meses de febrero y marzo del 2015 para recoger datos de supervivencia y tamaño de las diez especies estudiadas: tres especies arbóreas (Pinus halepensis, Tetraclinis articulata, Ceratonia siliqua) y siete arbustivas (Pistacia lentiscus, Quercus coccifera, Rhamnus lycioides, Ephedra fragilis, Chamaerops humilis, Juniperus oxycedrus y Olea europea ssp sylvestris). Además fue necesario realizar otras tareas como la revisión de los datos históricos de las repoblaciones realizadas como del clima de la zona.Los resultados muestran mayor supervivencia y crecimiento de los plantones plantados en la solana sobre los de umbría, y sobre todo sobre los ubicados en la unidad de terrazas forestales. Además se encontró una mayor supervivencia de los especímenes plantados en la campaña del año 2004 respecto a los introducidos en la campaña del 2003.

Biomass of understory species of Pinus halepensis Mill. forests in the Kassandra Peninsula - Chalkidiki

1998 ◽  
Vol 63 ◽  
Author(s):  
P. Smiris ◽  
F. Maris ◽  
K. Vitoris ◽  
N. Stamou ◽  
P. Ganatsas
Keyword(s):  
Moisture Content ◽  
Aboveground Biomass ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Biomass Estimation ◽  
Regression Equations ◽  
Pistacia Lentiscus ◽  
Quercus Coccifera ◽  
Understory Species ◽  
Cistus Incanus

This  study deals with the biomass estimation of the understory species of Pinus halepensis    forests in the Kassandra peninsula, Chalkidiki (North Greece). These  species are: Quercus    coccifera, Quercus ilex, Phillyrea media, Pistacia lentiscus, Arbutus  unedo, Erica arborea, Erica    manipuliflora, Smilax aspera, Cistus incanus, Cistus monspeliensis,  Fraxinus ornus. A sample of    30 shrubs per species was taken and the dry and fresh weights and the  moisture content of    every component of each species were measured, all of which were processed  for aboveground    biomass data. Then several regression equations were examined to determine  the key words.

scholarly journals Stand-level biomass models for predicting C stock for the main Spanish pine species

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ana Aguirre ◽  
Miren del Río ◽  
Ricardo Ruiz-Peinado ◽  
Sonia Condés
Keyword(s):  
Form Factor ◽  
Pinus Halepensis ◽  
Dry Weight ◽  
Pinus Nigra ◽  
Carbon Stocks ◽  
Tree Size ◽  
Pine Forests ◽  
Stand Volume ◽  
Biomass Models ◽  
Pine Species

Abstract Background National and international institutions periodically demand information on forest indicators that are used for global reporting. Among other aspects, the carbon accumulated in the biomass of forest species must be reported. For this purpose, one of the main sources of data is the National Forest Inventory (NFI), which together with statistical empirical approaches and updating procedures can even allow annual estimates of the requested indicators. Methods Stand level biomass models, relating the dry weight of the biomass with the stand volume were developed for the five main pine species in the Iberian Peninsula (Pinus sylvestris, Pinus pinea, Pinus halepensis, Pinus nigra and Pinus pinaster). The dependence of the model on aridity and/or mean tree size was explored, as well as the importance of including the stand form factor to correct model bias. Furthermore, the capability of the models to estimate forest carbon stocks, updated for a given year, was also analysed. Results The strong relationship between stand dry weight biomass and stand volume was modulated by the mean tree size, although the effect varied among the five pine species. Site humidity, measured using the Martonne aridity index, increased the biomass for a given volume in the cases of Pinus sylvestris, Pinus halepensis and Pinus nigra. Models that consider both mean tree size and stand form factor were more accurate and less biased than those that do not. The models developed allow carbon stocks in the main Iberian Peninsula pine forests to be estimated at stand level with biases of less than 0.2 Mg∙ha− 1. Conclusions The results of this study reveal the importance of considering variables related with environmental conditions and stand structure when developing stand dry weight biomass models. The described methodology together with the models developed provide a precise tool that can be used for quantifying biomass and carbon stored in the Spanish pine forests in specific years when no field data are available.

Stomiopeltis pinastri. [Descriptions of Fungi and Bacteria].

2007 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
New York ◽  
Pinus Ponderosa ◽  
Pinus Contorta ◽  
Pinus Halepensis ◽  
Conservation Status ◽  
Pinus Nigra ◽  
Pinus Monticola ◽  
Pinus Caribaea ◽  
Pinus Roxburghii ◽  
Diagnostic Features

Abstract A description is provided for Stomiopeltis pinastri, which are found on dead pine needles. Details are given of its hosts (Cupressus abramsiana, Juniperus communis, Picea sp., Pinus brutia, Pinus caribaea, Pinus cembra, Pinus contorta, Pinus halepensis, Pinus montezumae, Pinus monticola, Pinus mugo, Pinus muricata, Pinus nigra, Pinus nigra var. austriaca, Pinus nigra var. maritime, Pinus pinaster, Pinus ponderosa, Pinus radiata, Pinus roxburghii, Pinus strobus, Pinus sylvestris, Pinus taeda, Pinus thunbergiana [Pinus thunbergii], Pinus wallichiana and Protium sp.), associated species, geographical distribution (Canada (British Columbia), USA (California, Georgia, New York, North Carolina, Tennessee and Washington), Brazil (Pernambuco), India (Himachal Pradesh and Jammu-Kashmir), Pakistan, Portugal (Azores), Austria, Belgium, Czech Republic, Irish Republic, Finland, France, Germany, UK, Greece, Italy, Netherlands, Poland, San Marino, Spain, Sweden and Switzerland), transmission, diagnostic features and conservation status.

Changes in terpene content and emission in potted Mediterranean woody plants under severe drought

1998 ◽  
Vol 76 (8) ◽  
pp. 1366-1373 ◽  
Author(s):  
J Llusià ◽  
J Peñuelas
Keyword(s):  
Woody Plants ◽  
Pinus Halepensis ◽  
Woody Species ◽  
Severe Drought ◽  
Pistacia Lentiscus ◽  
Emission Rates ◽  
Phillyrea Latifolia ◽  
Drought Conditions ◽  
Terpene Emission Rates ◽  
Phillyrea Angustifolia

Terpene concentration and emission were studied in potted plants of some of the most common Mediterranean woody species (Pinus halepensis L., Pistacia lentiscus L., Cistus albidus L., Cistus monspeliensis L., Quercus ilex L., Quercus coccifera L., Phillyrea latifolia L., Phillyrea angustifolia L., and Arbutus unedo L.) under irrigation and under severe drought conditions that dropped relative water content to a range between 40% in Q. ilex and 85% in Phillyrea latifolia after withholding watering for one dry summer week. Terpene concentrations were detected in Pinus halepensis, Pistacia lentiscus, C. albidus, and C. monspeliensis, and they increased after withholding watering except in C. albidus. Terpene emission was detected in all species except Phillyrea angustifolia and A. unedo. Pinus halepensis showed the highest diurnal terpene emission rates of 86 µg·g-1 dry wt.·h-1 followed by C. albidus, Pistacia lentiscus, Q. ilex, Q. coccifera, Phillyrea latifolia, and C. monspeliensis (4 µg·g-1 dry wt.·h-1). Emitted terpenes represented from 0.33% of C fixed in C. monspeliensis to 10% in C. albidus. All species severely decreased their terpene emission rates under severe drought conditions. Emission by terpene-storing species (e.g., Pinus halepensis) was more related to temperature than in nonstoring species (e.g., Q. ilex), which showed emission relationships with photosynthetic rates. The monoterpenes alpha-pinene, beta-pinene, beta-phellandrene, and limonene and the sesquiterpene caryophyllene were the most abundant terpenes stored and emitted by these Mediterranean plant species.Key words: drought, Mediterranean conditions, terpene concentration, terpene emission, woody plants.

scholarly journals New Lectins from Mediterranean Flora. Activity against HT29 Colon Cancer Cells

2019 ◽  
Vol 20 (12) ◽  
pp. 3059 ◽  
Author(s):  
Isabel Oliveira ◽  
António Nunes ◽  
Ana Lima ◽  
Pedro Borralho ◽  
Cecília Rodrigues ◽  
...  
Keyword(s):  
Colon Cancer ◽  
Cancer Cells ◽  
Cancer Therapeutics ◽  
Ht29 Cell ◽  
Membrane Receptors ◽  
Antitumoral Activity ◽  
Colon Cancer Cells ◽  
Juniperus Oxycedrus ◽  
Arbutus Unedo ◽  
Ht29 Cells

Experiments conducted in vitro and in vivo, as well as some preclinical trials for cancer therapeutics, support the antineoplastic properties of lectins. A screening of antitumoral activity on HT29 colon cancer cells, based on polypeptide characterization and specific lectin binding to HT29 cells membrane receptors, was performed in order to assess the bioactivities present in four Mediterranean plant species: Juniperus oxycedrus subsp. oxycedrus, Juniperus oxycedrus subsp. badia, Arbutus unedo and Corema album. Total leaf proteins from each species were evaluated with respect to cell viability and inhibitory activities on HT29 cells (cell migration, matrix metalloproteinase –MMP proteolytic activities). A discussion is presented on a possible mechanism justifying the specific binding of lectins to HT29 cell receptors. All species revealed the presence of proteins with affinity to HT29 cell glycosylated receptors, possibly explaining the differential antitumor activity exhibited by the two most promising species, Juniperus oxycedrus subsp. badia and Arbutus unedo.

scholarly journals Flora y vegetación de la Sierra de Alcaparaín (Málaga, España)

2017 ◽  
Vol 40 ◽  
pp. 107 ◽  
Author(s):  
Andrés V. Pérez-Latorre ◽  
Federico Casimiro-Soriguer Solanas ◽  
Baltasar Cabezudo
Keyword(s):  
Pinus Halepensis ◽  
Quercus Suber ◽  
European Population ◽  
Aleppo Pine ◽  
Mountain Range ◽  
Juniperus Oxycedrus ◽  
Juniperus Phoenicea ◽  
Special Area ◽  
New Syntaxa ◽  
Quercus Rotundifolia

Español. El objetivo de este trabajo es realizar un catálogo de la flora, de las comunidades vegetales y el estudio del dinamismo sucesional y del paisaje vegetal de la Sierra de Alcaparaín, que forma parte de una Zona de Especial Conservación (ZEC) situada en la provincia de Málaga (Andalucía, España). El macrobioclima es de tipo mediterráneo con termotipos termo y mesomediterráneo y ombrotipos seco y subhúmedo. El área de estudio está compuesta geológicamente por materiales calizo-dolomíticos, silíceos y peridotíticos, con elevadas pendientes y altitudes entre 400 y 1295 m. y se encuentra en la provincia fitogeográfica Bética (región Mediterránea), con los sectores Rondeño (zonas calizo-dolomíticas), Malacitano-Axarquiense (zonas silíceas) y Bermejense (zonas peridotíticas). El catálogo florístico se compone de 467 taxones, destacando el endemismo local Armeria grajoana y Centaurea carratracensis (VU), endémica del subsector Carratracense (sector Bermejense). Otros taxones interesantes son Linaria clementei (VU), Platycapnos tenuiloba subsp. parallela (VU), Polygala webbiana (única localidad europea), Salvia candelabrum (VU) y Sarcocapnos baetica subsp. baetica (VU). Son remarcables también un total de 7 serpentinófitos destacando Crepis bermejana, Galium boissieranum (VU) y G. viridiflorum (VU). Se han catalogado 28 comunidades y asociaciones vegetales, entre las que destacan como novedades sintaxonómicas la vegetación glerícola vivaz sobre peridotitas (Crambe filiformisCentaureetum carratracensis comb. nova et stat. nov.), los jarales silicícolas rondeños (Lavandulo stoechadisGenistetum equisetiformis ulicetosum baetici subass. nova), los pinares-sabinares mesomediterráneos (Pino halepensis-Juniperetum phoeniceae rhamnetosum myrtifoliae subass. nova) y los encinares edafoxerófilodolomitícolas (Rhamno myrtifoliae-Quercetum rotundifoliae ass. nova). El dinamismo sucesional se expresa en seis series de vegetación. Dos series climatófilas termo y mesomediterráneas de Quercus rotundifolia y de Quercus suber. Tres series edafoxerófilas: termo-mesomediterránea calcícola-dolomitícola de Pinus halepensis y Juniperus phoenicea, mesomediterránea dolomitícola de Quercus rotundifolia y serpentinícola con Juniperus oxycedrus. Existe también una serie edafohigrófila de saucedas (Salix pedicellata). En los frecuentes hábitats rupícolas se describen 3 complejos topogénicos (entre ellos uno con Saxifraga globulifera) y 2 glerícolas (uno sobre kakiritas con Linaria clementei y otro sobre serpentinas con Centaurea carratracensis). En la Sierra existen 8 grandes unidades de paisaje zonopotencial, caracterizados en gran medida por la presencia de Quercus rotundifolia y Q. suber, así como por gimnospermas como Pinus halepensis, Juniperus phoenicea y J. oxycedrus.English. The main objective of this work is to catalogue the flora and plant communities and to study the successional dynamics of the vegetation and landscape in the Alcaparain mountain range, which is part of a Special Area of Conservation (SAC) located in the province of Malaga (Andalusia, Spain). The macrobioclimate is Mediterranean with thermomediterranean and mesomediterranean thermotypes (vegetation belts) and dry and sub-humid ombrotypes. The study area is geologically composed of limestone-dolomitic materials, siliceous and ultramafic, with steep slopes and altitudes between 400 and 1295 m. and it is placed in the Betica phytogeographical province (Mediterranean region), with Rondeño sector (limestone-dolomite areas) Malacitano-Axarquiense sector (siliceous areas) and Bermejense sector (peridotite-ultramafic areas). The floristic list consists of 467 taxa, highlighting local endemism Armeria grajoana and Centaurea carratracensis (VU), this latter endemic to the Carratracense subsector (Bermejense sector). Other interesting taxa are Linaria clementei (VU), Platycapnostenuiloba subsp. parallela (VU), Polygala webbiana (unique European population), Salvia candelabrum (VU) and Sarcocapnos baetica subsp. baetica (VU). Also noteworthy are a total of 7 serpentinophytes highlighting Crepis bermejana, Galium boissieranum (VU) and G. viridiflorum (VU). 28 communities and plant associations have been catalogued, among which are new syntaxa as the perennial scree vegetation on peridotites (Crambe filiformisCentaureetum carratracensis comb. nova et stat. nov.), the silicicolous shrublands of Rondense subsector (Lavandulo stoechadis-Genistetum equisetiformis ulicetosum baetici subass. nova), the mesomediterranean pine-juniper open forest (Pino halepensis-Juniperetum phoeniceae rhamnetosum myrtifoliae subass. nova) and dolomitic edaphoxerophyllous oak shrublands (Rhamno myrtifoliae-Quercetum rotundifoliae ass. nova). The successional dynamism is expressed in six vegetation series. Two are thermo- and mesomediterranean climatophilous series of Quercus rotundifolia and Quercus suber respectively. Three are edaphoxerophyllous series: thermo-mesomediterranean calcicolous-dolomiticolous with Aleppo pine and Juniperus phoenicea, dolomiticolous mesomediterranean of Quercus rotundifolia and serpentinicolous with Juniperus oxycedrus. There is also one edaphohygrophyllous series of willow (Salix pedicellata). Vegetation of the frequent rocky and cliff habitats are described in three topogenous complexes (including one with Saxifraga globulifera) and two in screes (one on kakirite sands with Linaria clementei and another on serpentine small slopes with Centaurea carratracensis). In the Sierra there are eight large zonopotential units of landscape, mainly characterized by the presence of Quercus rotundifolia (and in a lesser extent, Q. suber) as well as gymnosperms as Aleppo pine, Juniperus phoenicea and J. oxycedrus. 

Mediterranean trees vulnerability to climate change will not be minimized through hydraulic safety traits adjustments.

2021 ◽  
Author(s):  
Myriam Moreno ◽  
Guillaume Simioni ◽  
Jean-Marc Limousin ◽  
Jesus Rodriguez-Calcerrada ◽  
Julien Ruffault ◽  
...  
Keyword(s):  
Climate Change ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Rooting Depth ◽  
Quercus Pubescens ◽  
Widespread Species ◽  
Turgor Loss Point ◽  
Safety Margins ◽  
Significant Difference ◽  
Hydraulic Safety

<p><span>Climate change in the Mediterranean region leads to an intensification of summer droughts. These episodes of extreme water stress threaten the survival of tree species and, by the same token, would affect the structure and ecosystem services of woodlands. Indeed, in conditions of prolonged and intense drought, one of the major risks for trees is the hydraulic failure due to high embolism level. Xylem embolism risk depends essentially on various leaf and hydraulic traits including (i) the vulnerability of their xylem to cavitation, (ii) the turgor loss point (a surrogate for stomatal control) and (iii) their cuticular transpiration (gmin). The two former traits can be used to compute hydraulic safety margins (HSM). </span></p><p><span>In order to assess whether trees will survive future climatic conditions, it is necessary to quantify and assess the plasticity of these traits to intensified drought. In this study, we used three rainfall exclusion experiments established in mature forests in south-eastern France (Font-blanche, Puéchabon and O3HP experimental sites) to measure these traits and evaluate their ability to adjust to aggravated drought conditions for three Mediterranean widespread species: </span><span><em>Quercus ilex</em></span><span>, </span><span><em>Quercus Pubescens</em></span><span>, and </span><span><em>Pinus halepensis</em></span><span>. We performed pressure-volume curves of trees from rainfall exclusion and control plots to see if adjustments of gmin and leaf hydraulic traits involved in stomatal regulation occurred in these three species. Using the optical method and cavitron, we also quantified the plasticity of xylem vulnerability to cavitation by comparing the values of water potential leading to a 50% reduction in plant hydraulic conductance (P50). </span></p><p><span>Our results show that </span><span><em>Quercus pubescens</em></span><span> has the lowest HSM while </span><span><em>Quercus ilex</em></span><span> has the highest. In addition, gmin is higher for </span><span><em>Quercus pubescens</em></span><span> than for the other two species. All together these results suggest that </span><span><em>Quercus pubescens</em></span><span> is the most vulnerable to drought among the three studied. Globally, for most traits and species no significant difference was found between treatments. The only exception was for </span><span><em>Quercus ilex</em></span><span> that exhibited lower turgor loss point (Ψtlp) in the dry treatment. Drought acclimation for these species may rather depend on other traits, such as leaf area reduction or rooting depth. To integrate the role of these traits to estimate the historic and future mortality risk for these species, the use of hydraulic based models will be of interest. </span></p>

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