Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Pays Bas → 2019 → Effects of the combined action of fire and increased dry conditions on Mediterranean forests

Utrecht University (2019)

Effects of the combined action of fire and increased dry conditions on Mediterranean forests

Makavou, K.

Titre : Effects of the combined action of fire and increased dry conditions on Mediterranean forests

Auteur : Makavou, K.

Université de soutenance : Utrecht University

Grade : Master of Science (MS) 2019

Résumé _ It has been recently recognized that Mediterranean forests are threated by the combined effects of repeated fires and drought disturbances, which in turn favor the persistence of early successional plant types, such as shrubs and grasses. This research explored how Mediterranean communities were shaped under fire disturbances and different levels of water availability resulted by different precipitation scenarios simulations. To achieve this, soil water dynamics were coupled with vegetation dynamics of the existing Baudena et al., [2019] model, linking plants’ colonization and post-fire responses with soil water content. Subsequently, experiments of seasonal and intra-seasonal rainfall variability were conducted. The results showed that the successional order that leads to a late oak forest formation was disrupted by water-stress conditions and replaced by a transient mixed community or an alternative shrubland state, in a timeframe of 1000 years. Water-stress conditions were observed for precipitation scenarios that corresponded to low rainfall intensity and sparse rainfall events, for annual rainfall 200-400mm/y. Under these conditions, both colonization and resprouting abilities of oaks were affected, resulting their total cover to constantly stay at relatively low levels. Among these two functional traits, oaks’ colonization appeared to be more severely affected by water-stress

Présentation

Page publiée le 8 avril 2021