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

Autor: Jessada Sopharat, Frederic Gay, Philippe Thaler, Sayan Sdoodee, Supat Isarangkool Na Ayutthaya, Charlchai Tanavud, Claude Hammecker, Frederic C. Do
Rok vydání: 2015
Předmět:
VARIATION SAISONNIERE
Vapour Pressure Deficit
F62 - Physiologie végétale - Croissance et développement
Teneur en eau
drought
Plant Science
Relation plante eau
relative extractable soil water
Original Research Article
Adaptation physiologique
Transpiration
SECHERESSE
biology
Ecology
Canopy conductance
Hevea brasiliensis
Variation saisonnière
PLUIE
INDICE FOLIAIRE
Atmosphère
P40 - Météorologie et climatologie
Stress dû à la sécheresse
EAU DU SOL
Climate change
lcsh:Plant culture
Potentiel hydrique
Sécheresse
Métabolisme
PLANTATION
lcsh:SB1-1110
Teneur en eau du sol
Leaf area index
Hydrology
high evaporative demand
EVAPOTRANSPIRATION POTENTIELLE
Réponse de la plante
Modèle de simulation
biology.organism_classification
MODELISATION
potential transpiration model
canopy phenology
Sustainability
Soil water
Environmental science
H50 - Troubles divers des plantes
CAOUTCHOUC
Zdroj: Frontiers in Plant Science, Vol 5 (2015)
Frontiers in Plant Science
ISSN: 1664-462X
DOI: 10.3389/fpls.2014.00753
Popis: 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 vapour 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 towards more sustainable rubber plantations.
Databáze: OpenAIRE
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