Effect of Intraspecific Competition and Substrate Type on Terpene Emissions from Some Mediterranean Plant Species

International audienceCompetition is an important factor that has been extensively reported in the Mediterranean area. There is evidence that leaf terpene accumulation may vary between plants growing on calcareous and siliceous soils. In the present study, leaf terpene emissions from potted seedlings of Pinus halepensis, Cistus albidus, and Quercus coccifera, growing under natural environmental conditions on calcareous and siliceous substrates, were studied by using a bag enclosure method. In both substrates, seedlings were potted alone and in intraspecific competition, to examine the effect of substrate type and that of intraspecific competition on terpene emissions. The results showed that competition favored: (i) overall monoterpene and sesquiterpene emissions from Q. coccifera; (ii) overall monoterpene emissions from P. halepensis; (iii) overall sesquiterpene emissions from C. albidus. Substrate type affected terpene emissions to a limited extent and in a species-specific way. Whereas for Q. coccifera, the overall monoterpene emissions and that of Allo-aromadendrene were favored on siliceous substrate, no significant changes were found in emissions from P. halepensis. Only the release of AR-curcumene from C. albidus was higher on siliceous substrate. We also found high variability in terpene emission composition from the study species, particularly for P. halepensis and Q. coccifera. These two species released both monoterpenes and sesquiterpenes, instead of monoterpenes only, as shown in previous studies

"Etude éco-phénologique de l'Alfa en Tunisie centrale - application en vue de la sauvegarde et de l'amélioration des nappes alfatières tunisiennes". Sassi Ghrab

Bonin Gilles. "Etude éco-phénologique de l'Alfa en Tunisie centrale - application en vue de la sauvegarde et de l'amélioration des nappes alfatières tunisiennes". Sassi Ghrab. In: Ecologia mediterranea, tome 7 n°2, 1981. p. 120

Les édifices travertineux et l'histoire de l'environnement dans le midi de la France, Ed. J. Vaudour, Rapport des travaux 1988 -N XVII

Bonin Gilles. Les édifices travertineux et l'histoire de l'environnement dans le midi de la France, Ed. J. Vaudour, Rapport des travaux 1988 -N XVII. In: Ecologia mediterranea, tome 14 n°1-2, 1988. p. 201

L'étagement de la végétation dans l'Apennin méridional

The author recalls the main facts that enable to recognize in Southern Apennines four vegetation levels : the very lrnge mediterranean level comprises two sub-levels : a "thermomediterranean" level characterized by the Oleo-lenticetum and a "mesomediterranean" level represented by the units of the Quercion ilicis. The supramediterranean level is essentially represented by the Melitto-Quercion and partly by the Ostryo-Carpinion, whereas the mountainous level, with a mediterranean character, is the horizon of the Geranio-Fagion. At last, the oro-mediterranean level, well individualized though strongly localized, is characterized by the Seslerion apenninae.L'auteur nappelle les principaux éléments qui permettent de reconnaître dans l'Apennin méridional quatre étages de végétation. L'étage méditerranéen s. l. à très large extension est composé de deux sous-étages : thermoméditerranéen caractérisé par l'Oléo-lenticetum, et mésoméditerranéen représenté pan les unités du Quercius ilicis. L'étage supraméditerranéen est essentiellement lié au Mellitto Quercion et partiellement à l'Ostryo carpinion alors que l'étage montagnard à caractère méditerranéen est l'horizon du Geranio Fagion. Enfin l’étage oroméditerranéen bien individualisé, quoique très localisé, est canactérisé par le Seslerion apenninae.Bonin Gilles. L'étagement de la végétation dans l'Apennin méridional. In: Ecologia mediterranea, tome 7 n°2, 1981. pp. 79-91