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Article Dans Une Revue Australian Journal of Crop Science Année : 2011

Vapour pressure deficit affects diurnal girth fluctuation of rubber trees ( Hevea brasiliensis)

Résumé

Diurnal variation in stem girth as affected by three different ranges (0.43, 1.78 and 2.11 kPa) of air vapour pressure deficit (VPD) under minimum soil water stress was studied in mature rubber trees (Hevea brasiliensis) in Northeast Thailand. Diurnal cycle of shrinkage and swelling of stem girth was observed in all ranges of VPD. Stem girth as expressed by maximum daily trunk shrinkage (MDS) decreased during the day in association with high sap flow and high VPD, and then stem girth increased during the night when VPD and sap flow were low. Stem girth fluctuation was inversely related to VPD and sap flow, especially at higher ranges of VPD. A positive and significant correlation of MDS on VPD (r = 0.42, p <= 0.01) and negative correlation of MDS on sap flow (r = 0.41, p <= 0.01) were observed, whereas positive correlations of trunk growth rate (TGR) on VPD (r = 0.19) and of TGR on sap flow (r = 0.18) were not significant. This indicates that MDS was sensitive to air moisture conditions. Measurement of MDS could be easily automated and MDS signal intensity could be used as a tool for predicting plant water status and utilizing crop modeling.
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Dates et versions

hal-00964550 , version 1 (28-05-2020)

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Junya J. Junjittakarn, Viriya V. Limpinuntana, Frédéric F. Do, Krirk K. Pannengpetch, Supat S. Isarangkool Na Ayutthaya, et al.. Vapour pressure deficit affects diurnal girth fluctuation of rubber trees ( Hevea brasiliensis). Australian Journal of Crop Science, 2011, 5 (12), pp.1622-1630. ⟨hal-00964550⟩
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