NDLI: Sap flow measurements by thermal dissipation method using cyclic heating: a processing method accounting for the non-stationary regime

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Variant allometric scaling relationships between bud size and secondary shoot growth in Quercus faginea: implications for the climatic modulation of canopy growth

Sap flow measurements by thermal dissipation method using cyclic heating: a processing method accounting for the non-stationary regime

Is the ranking of poplar genotypes for leaf carbon isotope discrimination stable across sites and years in two different full-sib families?

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Sap flow measurements by thermal dissipation method using cyclic heating: a processing method accounting for the non-stationary regime

Content Provider	Springer Nature Link
Author	Nourtier, Marie Chanzy, André Granier, André Huc, Roland
Copyright Year	2011
Abstract	The thermal dissipation method to measure sap flow in tree stems can be used with cyclic heating to reduce electricity consumption and/or to account for natural temperature gradients. Nevertheless, errors in sap flow estimation can be introduced because the thermal equilibrium has not been reached at the measurement time. We propose a method to assess this error and to estimate sap flow density. It is based on Granier’s (Ann For Sci, 42:193–200, 1985) non-species-specific calibration. This work was performed on silver fir trees (Abies alba Mill.) with low sap flux densities (maximum of 0.68 L dm$^{−2}$ h$^{−1}$). To estimate the error, we developed a calibration procedure using the experimental set-up in trees. This approach is based on a pair of sensors having similar temporal patterns in sap flux density, one being under cyclic heating while the other is continuously heated. Applying Granier’s calibration without correction led to large errors (relative error reached 200%). After correction, the error was greatly diminished; it was lower than 0.042 L dm$^{−2}$ h$^{−1}$ when using short heating cycles (0.5 h). The correction was applicable to all silver fir trees monitored. However, this method can be easily repeated to investigate the validity domain of the correction.
Starting Page	1255
Ending Page	1264
Page Count	10
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	68
Issue Number	7
e-ISSN	1297966X
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-06
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	Subscribed
Subject Keyword	Sap flow Thermal dissipation method Cyclic heating Error correction Silver fir Forestry Management Forestry Tree Biology Wood Science & Technology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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