@article{fdi:010094369,
  title = {{S}elf-potential signals related to tree transpiration in a {M}editerranean climate},
  author = {{H}u, {K}. {Y}. and {L}oiseau, {B}ertille and {C}arri{\`e}re, {S}. {D}. and {L}esparre, {N}. and {C}hampollion, {C}. and {M}artin-{S}t{P}aul, {N}. {K}. and {L}inde, {N}. and {J}ougnot, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}lant transpiration is a crucial process in the water cycle, and its quantification is essential for understanding terrestrial ecosystem dynamics. {W}hile 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. {S}elf-potential ({SP}), a passive geophysical method, holds potential for constraining transpiration rates, though many questions remain regarding the electrophysiological processes occurring within trees. {I}n this study, we continuously measured tree {SP} and sap velocity on three tree species for 1 year in a {M}editerranean climate. {U}sing wavelet coherence analysis and variational mode decomposition, we explored the empirical relationship between tree {SP} and transpiration. {O}ur 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. {W}e 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. {D}uring dry seasons, the electrokinetic effect emerges as the primary contribution to tree {SP}, indicating its potential utility in assessing transpiration rates. {O}ur results emphasize the need for improved electrode configurations and physiochemical modelling to elucidate tree {SP} in relation to transpiration.},
  keywords = {{FRANCE} ; {ZONE} {MEDITERRANEENNE}},
  booktitle = {},
  journal = {{H}ydrology and {E}arth {S}ystem {S}ciences},
  volume = {29},
  numero = {13},
  pages = {2997--3018},
  ISSN = {1027-5606},
  year = {2025},
  DOI = {10.5194/hess-29-2997-2025},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094369},
}