Sopharat J. auteur aut IRD Gay F. auteur aut IRD Thaler P. auteur aut IRD Sdoodee S. auteur aut IRD Isarangkool Na Ayutthaya S. auteur aut IRD Tanavud C. auteur aut IRD Hammecker Claude auteur aut IRD Do Frédéric auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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. specialized CAOUTCHOUC PLANTATION EVAPOTRANSPIRATION POTENTIELLE SECHERESSE MODELISATION INDICE FOLIAIRE EAU DU SOL PLUIE VARIATION SAISONNIERE ZONE TROPICALE HUMIDE THAILANDE 072AGRMET01 122APPLIC 5 art. 753 [11 ] 2015 1664-462X https://www.documentation.ird.fr/hor/fdi:010063319 10.3389/fpls.2014.00753 1664-462X [F B010063319] https://www.documentation.ird.fr/hor/fdi:010063319 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers15-01/010063319.pdf IRD - Base Horizon / Pleins textes 2015-01-28 2015-08-21 fdi:010063319 fre