@article{PAR00004648,
  title = {{T}ransient thermal dissipation method of xylem sap flow measurement : multi-species calibration and field evaluation},
  author = {{A}yutthaya, {S}. {I}. {N}. and {D}o, {F}r{\'e}d{\'e}ric and {P}annengpetch, {K}. and {J}unjittakarn, {J}. and {M}aeght, {J}ean-{L}uc and {R}ocheteau, {A}lain and {C}ochard, {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he transient thermal dissipation ({TTD}) method developed by {D}o and {R}ocheteau (2002b) is a close evolution of the original constant thermal dissipation ({CTD}) method of {G}ranier (1985). {T}he {TTD} method has the advantage of limiting the influence of passive natural temperature gradients and of yielding more stable zero-flux references at night. {B}y analogy with the {CTD} method, the transient method was first calibrated on synthetic porous material (sawdust) on the assumption that the relationship was independent of the woody species. {H}ere, our concern was to test the latter hypothesis with a 10-min heating time in three tropical species: {H}evea brasiliensis {M}ull. {A}rg., {M}angifera indica {L}. and {C}itrus maxima {M}err. {A} complementary objective was to compare the field estimates of daily transpiration for mature rubber trees with estimates based on a simplified soil water balance in the dry season. {T}he calibration experiments were carried out in the laboratory on cut stems using an {HPFM} device and gravimetric control of water flow up to 5 {L} dm(-2) h(-1). {N}ineteen response curves were assessed on fully conductive xylem, combining 11 cut stems and two probes. {T}he field evaluation comprised five periods from {N}ovember 2007 to {F}ebruary 2008. {E}stimates of daily transpiration from the measurement of sap flow were based on the 41 sensors set up on 11 trees. {S}oil water depletion was monitored by neutron probe and 12 access tubes to a depth of 1.8 m. {T}he calibrations confirmed that the response of the transient thermal index to flow density was independent of the woody species that were tested. {T}he best fit was a simple linear response ({R}-2 = 0.88, n = 276 and {P} < 0.0001). {T}he previous calibration performed by {D}o and {R}ocheteau (2002b) on sawdust fell within the variability of the multi-species calibration; however, there were substantial differences with the average curve at extreme flow rates. {F}ield comparison with soil water depletion in the dry season validated to a reasonable extent the absolute estimates of transpiration acquired with the 10-min {TTD} method. {I}n conclusion, evidence for the independence of calibration from woody species and the simple linear response of the thermal index strengthen the interest of the {TTD} method with 10-min heating.},
  keywords = {{C}itrus maxima ; cut stem experiment ; {G}ranier's sensors ; {H}evea brasiliensis ; {M}angifera indica ; soil waterbalance ; tree transpiration ; validation},
  booktitle = {},
  journal = {{T}ree {P}hysiology},
  volume = {30},
  numero = {1},
  pages = {139--148},
  ISSN = {0829-318{X}},
  year = {2010},
  DOI = {10.1093/treephys/tpp092},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00004648},
}