Publications des scientifiques de l'IRD

Hu K. Y., Loiseau Bertille, Carrière S. D., Lesparre N., Champollion C., Martin-StPaul N. K., Linde N., Jougnot D. (2025). Self-potential signals related to tree transpiration in a Mediterranean climate. Hydrology and Earth System Sciences, 29 (13), p. 2997-3018. ISSN 1027-5606.

Titre du document
Self-potential signals related to tree transpiration in a Mediterranean climate
Année de publication
2025
Type de document
Article référencé dans le Web of Science WOS:001529202100001
Auteurs
Hu K. Y., Loiseau Bertille, Carrière S. D., Lesparre N., Champollion C., Martin-StPaul N. K., Linde N., Jougnot D.
Source
Hydrology and Earth System Sciences, 2025, 29 (13), p. 2997-3018 ISSN 1027-5606
Plant transpiration is a crucial process in the water cycle, and its quantification is essential for understanding terrestrial ecosystem dynamics. While sap flow measurements offer a direct method for estimating individual tree transpiration, their effectiveness may be limited by the use of point sensors; species-specific calibration requirements; and baseline uncertainties, particularly the assumption of negligible nighttime flow, which may not always hold. Self-potential (SP), a passive geophysical method, holds potential for constraining transpiration rates, though many questions remain regarding the electrophysiological processes occurring within trees. In this study, we continuously measured tree SP and sap velocity on three tree species for 1 year in a Mediterranean climate. Using wavelet coherence analysis and variational mode decomposition, we explored the empirical relationship between tree SP and transpiration. Our analysis revealed strong coherence between SP and sap velocity at diurnal timescales, with coherence weakening and phase shifts increasing on days with higher water supply. We estimated electrokinetic coupling coefficients using a linear regression model between SP and sap velocity variations at the diurnal scale, resulting in values typically found in porous geological media. During dry seasons, the electrokinetic effect emerges as the primary contribution to tree SP, indicating its potential utility in assessing transpiration rates. Our results emphasize the need for improved electrode configurations and physiochemical modelling to elucidate tree SP in relation to transpiration.
Plan de classement
Bioclimatologie [072] ; Sciences du monde végétal [076]
Description Géographique
FRANCE ; ZONE MEDITERRANEENNE
Localisation
Fonds IRD [F B010094369]
Identifiant IRD
fdi:010094369
 Open Access  DOI
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