| Titre : | Assessing ecosystem functioning on Mediterranean forests in the context of global change: the case study of Mont Ventoux (France) |
| Auteurs : | N. Lopez Garcia, - Auteur ; INRA Institut National de la Recherche Agronomique, Laboratoire de Recherches Forestieres Mediterraneennes, Unite de Recherchess de Prevention des Incendies de Foret, Avignon (FRA), - Auteur ; Universitat de Lleida;Escola Tecnica Superior d'Enginyeria Agraria;Lleida (ESP), - Auteur |
| Type de document : | thèse/mémoire |
| Année de publication : | 2018 |
| Format : | 65 p. |
| Note générale : |
Dirigé par :
Dr. Hendrik Davi. Ecologie des Forêts Méditerranéennes (INRA-PACA) Encadrants : Dr. François Lefèvre. Ecologie des Forêts Méditerranéennes (INRA-PACA) Dr. José Antonio Bonet Lledós. University of Lleida (UdL) |
| Langues: | = Anglais |
| Mots-clés: | CHANGEMENT GLOBAL ; ECOSYSTEME FORESTIER ; BILAN DE CARBONE ; ECOPHYSIOLOGIQUE ; COVARIANCE |
| Résumé : | To assess the global change effects on the functioning of Mediterranean forests ecosystems, we implemented a physiologically multi-layer, process-based model (CASTANEA). The model was firstly evaluated on three Integrated Carbon Observation System (ICOS) sites by comparing measured fluxes by eddy covariance technics and simulations of Gross Primary Production (GPP), Ecosystem Respiration (Reco), and Net Ecosystem Exchange (NEE). A set of simulations have been then conducted on Mont Ventoux (South-eastern France) on nine species, which are present in Mediterranean forest ecosystems. The selected species included deciduous species (Fagus sylvatica L., Quercus pubescens Mill.), coniferous species (Pinus halepensis Mill., Pinus nigra J.F.Arnold., Pinus sylvestris L., Pinus uncinata Ramond ex DC., Abies alba Mill., Cedrus Atlantica (Manetti ex Endl.) Carrière., and sclerophyllous evergreen species (Quercus ilex L.). The model was first operated by the results of the meteorological Safran-gauge-based analysis system for the period 1958 - 2016. Then, the model has been driven by two regional climate models (RCMs) for the historical period 1961-2015 and the period 2016 - 2100, following two Representative Concentration Pathway (RCP 4.5 and RCP 8.5) scenarios of the Intergovernmental Panel on Climate Change (IPCC). From 1958 to 2015, the average temperature risen by 2,8 ºC and the rainfall in altitude increased by 48,88 mm. For the future projections under the RCP 4.5 and RCP 8.5 scenarios from CNRM – CM5 (RCM) the average temperature will rise by 1,28 ºC and 4,52 ºC respectively, and the average rainfall will increase 180,48 mm under RCPs 4.5, but it will drop by -112,24 mm under RCPs 8.5. Future predictions by HadGEM2 – ES (RCM) under RCPs 4.5 and RCPs 8.5, the temperature on average will increase by 2,85 ºC and 5,79 ºC respectively; likewise, the precipitation on average will drop by -142,84 mm under RCPs 4.5 and by -212,67 mm under RCPs 8.5. The ecosystem always remains carbon sink; however, the pool strength globally decreases for future projections for coniferous species and to a lesser degree for deciduous forest and sclerophyllous evergreen. Besides, we observed a substantial decrease in the NEE as well as an increase in the mortality rate under RCP 8.5 on the HadGEM2 - ES model. By contrast, implemented silviculture have a positive effect, allowing an increase in the tree-ring width, the [NSC] and finally an increment in NEE as well as a significant decrease in the mortality rate. |
| Diplôme : | Mediterranean Forestry and Natural Resources Management |
Exemplaires (1)
| Centre | Localisation | Section | Cote | Statut | Disponibilité | Département |
|---|---|---|---|---|---|---|
| PACA | URFM Ecologie des Forêts Méditerranéennes | Ouvrages | M 444 GAR | Consultable sur place | Exclu du prêt |
Documents numériques (1)
 Memoire_2018_Noelia López García Adobe Acrobat PDF |
