Publications des scientifiques de l'IRD

Longepierre D., Mouillot Florent, Ouelhazi B., Ourcival J.M., Rocheteau Alain, Degueldre D., Rejeb M.N. (2014). True water constraint under a rainfall interception experiment in a Mediterranean shrubland (Northern Tunisia) : confronting discrete measurements with a plant-soil water budget model. In : Abeli T. (ed.), Jäkäläniemi A. (ed.), Gentili R. (ed.). Living with extremes : the dark side of global climate change. Plant Ecology, 215 (7), p. 779-794. ISSN 1385-0237.

Titre du document
True water constraint under a rainfall interception experiment in a Mediterranean shrubland (Northern Tunisia) : confronting discrete measurements with a plant-soil water budget model
Année de publication
2014
Type de document
Article
Auteurs
Longepierre D., Mouillot Florent, Ouelhazi B., Ourcival J.M., Rocheteau Alain, Degueldre D., Rejeb M.N.
In
Abeli T. (ed.), Jäkäläniemi A. (ed.), Gentili R. (ed.), Living with extremes : the dark side of global climate change
Source
Plant Ecology, 2014, 215 (7), p. 779-794 ISSN 1385-0237
Increased drought length and intensity is expected in the Mediterranean basin under anthropogenic increase in atmospheric CO2, leading to extreme events not yet encountered in the present climate variability. Understanding ecosystems responses and capturing peculiar ecophysiological processes related to these events have been investigated in the field by rainfall manipulation experiments. Quantifying the actual drought faced by the ecosystem under control and dry plots, or among experiments remain a key challenge for explaining functional impacts on plant growth. Full-profile soil water content can be tricky to assess in rocky soils, and time-consuming plant water potential measurements remain a discrete information unable to capture short rainfall pulses. We propose here to fully investigate the water budget of a total rainfall interception manipulation on a Mediterranean shrubland, coupled with a plant–soil water balance model. We could accurately simulate the seasonal course of plant water status, including small rainfall pulses. We then derived yearly estimates of water stress integral for each water treatment, leading to an estimate of 66–86 % increase of drought intensity for the dry treatment compared to the control. Comparing actual and expected plant water budget from simulations in the dry plots allowed to identify and quantify the impact of methodological issues related to rainfall interception experiments as side effects for intrusive rain drops and subsurface lateral water flow.
Plan de classement
Mathématiques appliquées [020MATH01] ; Climatologie [021CLIMAT] ; Mécanisme du cycle de l'eau [062MECEAU] ; Etude du bilan hydrique et ses applications au suivi hydrique ry-farming et pilotage de l'irrigation [072AGRMET02]
Descripteurs
ECOSYSTEME ; ARBUSTE ; SECHERESSE ; PRECIPITATION ; EAU DU SOL ; BILAN HYDRIQUE ; IRRIGATION ; MODELE MATHEMATIQUE ; VARIATION SAISONNIERE ; ETUDE COMPARATIVE ; CHANGEMENT CLIMATIQUE
Description Géographique
TUNISIE
Localisation
Fonds IRD [F B010062857]
Identifiant IRD
fdi:010062857
Contact