Publications des scientifiques de l'IRD

Sopharat J., Gay F., Thaler P., Sdoodee S., Isarangkool Na Ayutthaya S., Tanavud C., Hammecker Claude, Do Frédéric. (2015). A simple framework to analyze water constraints on seasonal transpiration in rubber tree (Hevea brasiliensis) plantations. Frontiers in Plant Sciences, 5, art. 753 [11 p.]. ISSN 1664-462X.

Titre du document
A simple framework to analyze water constraints on seasonal transpiration in rubber tree (Hevea brasiliensis) plantations
Année de publication
2015
Type de document
Article
Auteurs
Sopharat J., Gay F., Thaler P., Sdoodee S., Isarangkool Na Ayutthaya S., Tanavud C., Hammecker Claude, Do Frédéric
Source
Frontiers in Plant Sciences, 2015, 5, art. 753 [11 p.] ISSN 1664-462X
Climate change and fast extension in climatically suboptimal areas threaten the sustainability of rubber tree cultivation. A simple framework based on reduction factors of potential transpiration was tested to evaluate the water constraints on seasonal transpiration in tropical sub-humid climates, according pedoclimatic conditions. We selected a representative, mature stand in a drought-prone area. Tree transpiration, evaporative demand and soil water availability were measured every day over 15 months. The results showed that basic relationships with evaporative demand, leaf area index and soil water availability were globally supported. However, the implementation of a regulation of transpiration at high evaporative demand whatever soil water availability was necessary to avoid large overestimates of transpiration. The details of regulation were confirmed by the analysis of canopy conductance response to vapor pressure deficit. The final objective of providing hierarchy between the main regulation factors of seasonal and annual transpiration was achieved. In the tested environmental conditions, the impact of atmospheric drought appeared larger importance than soil drought contrary to expectations. Our results support the interest in simple models to provide a first diagnosis of water constraints on transpiration with limited data, and to help decision making toward more sustainable rubber plantations.
Plan de classement
Etude du besoin en eau des plantes (évopotranspirations de icients culturaux) [072AGRMET01] ; Applications diverses [122APPLIC]
Descripteurs
CAOUTCHOUC ; PLANTATION ; EVAPOTRANSPIRATION POTENTIELLE ; SECHERESSE ; MODELISATION ; INDICE FOLIAIRE ; EAU DU SOL ; PLUIE ; VARIATION SAISONNIERE
Description Géographique
ZONE TROPICALE HUMIDE ; THAILANDE
Localisation
Fonds IRD [F B010063319]
Identifiant IRD
fdi:010063319
Contact