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A simple framework to analyze water constraints on seasonal transpiration in rubber tree (Hevea brasiliensis) plantations

Sopharat Jessada, Gay Frédéric, Thaler Philippe, Sdoodee Sayan, Ayutthaya Supat Isarangkool Na, Tanavud Charlchai, Hammecker Claude, Do Frédéric C.. 2015. A simple framework to analyze water constraints on seasonal transpiration in rubber tree (Hevea brasiliensis) plantations. Frontiers in Plant Science, 5 (753), 11 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : 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. (Résumé d'auteur)

Mots-clés Agrovoc : Hevea brasiliensis, Transpiration, Modèle de simulation, Stress dû à la sécheresse, Métabolisme, Potentiel hydrique, Adaptation physiologique, Teneur en eau du sol, Teneur en eau, Atmosphère, Variation saisonnière, Relation plante eau, Sécheresse, Réponse de la plante

Mots-clés géographiques Agrovoc : Thaïlande

Classification Agris : F62 - Plant physiology - Growth and development
H50 - Miscellaneous plant disorders
P40 - Meteorology and climatology

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Sopharat Jessada, Prince of Songkla University (THA)
  • Gay Frédéric, CIRAD-PERSYST-UMR Eco&Sols (THA) ORCID: 0000-0002-7624-8489
  • Thaler Philippe, CIRAD-PERSYST-UMR Eco&Sols (THA)
  • Sdoodee Sayan, Prince of Songkla University (THA)
  • Ayutthaya Supat Isarangkool Na, Khon Kaen University (THA)
  • Tanavud Charlchai, Prince of Songkla University (THA)
  • Hammecker Claude, IRD (FRA)
  • Do Frédéric C., IRD (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/575546/)

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