@article{fdi:010057537, title = {{S}ap flow measurement by a single thermal dissipation probe : exploring the transient regime}, author = {{M}ahjoub, {I}. and {M}asmoudi, {M}. {M}. and {L}homme, {J}ean-{P}aul and {B}en {M}echlia, {N}.}, editor = {}, language = {{ENG}}, abstract = {{I}n thermal dissipation method the stationary regime is used to estimate sap flow density from the temperature difference between a heating probe and a non-heating one. {A} new approach, based on the non-stationary regime of a single heating probe, is investigated on an olive tree branch. {P}robe temperature is monitored for different flow densities and for heating and cooling modes. {M}easurement sequences of 10 min using 5 s time steps are made just after the heating is switched on or off. {R}esults show that temperature variation has a quasi-exponential phase whose duration decreases for increasing flow densities. {T}hermal indices using temperature of the probe measured at initial, final, and intermediate times t(i) were developed. {R}elationships between sap flow density and thermal indices were found to be linear for t(i) = 10 s-60 s with better coefficients of determination in cooling mode ({R}-2 = 0.94-0.96) than in heating ({R}-2 = 0.83-0.93). {V}alidation tests confirmed the robustness of the single probe method with lowest error obtained for t(i) = 20 s. {S}ingle probe method seems to be a promising technique to measure tree sap flow. {I}ts application could be considered under cooling mode using t(i) = 20 s and relatively short measurement sequences e. g. 5-10 min.}, keywords = {sap flow ; thermal dissipation ; single probe ; transient regime ; olive species}, booktitle = {}, journal = {{A}nnals of {F}orest {S}cience}, volume = {66}, numero = {6}, pages = {608}, ISSN = {1286-4560}, year = {2009}, DOI = {10.1051/forest/2009043}, URL = {https://www.documentation.ird.fr/hor/fdi:010057537}, }