The role of deep vadose zone water in tree transpiration during drought periods in karst settings – Insights from isotopic tracing and leaf water potential
| Autor: | Nicolas Patris, Albert Olioso, Nicolas Martin-StPaul, Hendrik Davi, Marina Gillon, Guillaume Simioni, Milanka Babic, Claude Doussan, Konstantinos Chalikakis, Simon Damien Carrière, Arnaud Jouineau, Coffi Belmys Cakpo |
|---|---|
| Přispěvatelé: | Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ecologie des Forêts Méditerranéennes (URFM), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Unité de recherche Plantes et Systèmes de Culture Horticoles (PSH), Institut de Recherche pour le Développement (IRD [Réunion]) |
| Rok vydání: | 2020 |
| Předmět: |
Mediterranean climate
Environmental Engineering 010504 meteorology & atmospheric sciences [SDV]Life Sciences [q-bio] Forests 010501 environmental sciences 01 natural sciences Quercus Soil Water balance Fagus sylvatica Xylem Vadose zone Fagus Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category biology Water Vegetation 15. Life on land Karst biology.organism_classification Pollution Droughts Abies alba Plant Leaves [SDE]Environmental Sciences Soil water Environmental science Seasons |
| Zdroj: | Science of the Total Environment Science of the Total Environment, Elsevier, 2020, pp.134332. ⟨10.1016/j.scitotenv.2019.134332⟩ |
| ISSN: | 0048-9697 1879-1026 |
| DOI: | 10.1016/j.scitotenv.2019.134332 |
| Popis: | sous-presse; International audience; Karst environments are unusual because their dry, stony and shallow soils seem to be unfavorable to vegetation, and yet they are often covered with forests. How can trees survive in these environments ? Where do they find the water that allows them to survive? This study uses midday and predawn water potentials and xylem water isotopes of branches to assess tree water status and the origin of transpired water. Monitoring was conducted during the summers of 2014 and 2015 in two dissimilar plots of Mediterranean forest located in karst environments. The results show that the three monitored tree species (Abies alba Mill, Fagus sylvatica L, and Quercus ilex L.) use deep water resources present in the karst vadose zone (unsaturated zone) more intensively during drier years. Quercus ilex, a species welladapted to water stress, which grows at the drier site, uses the deep water resource very early in the summer season. Conversely, the two other species exploit the deep water resource only during severe drought. These results open up new perspectives to a better understanding of ecohydrological equilibrium and to improved water balance modeling in karst forest settings. |
| Databáze: | OpenAIRE |
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