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            <title xml:lang="en">Sap flow measurements by thermal dissipation method using cyclic heating: a processing method accounting for the non-stationary regime</title>
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            <idno type="halRefHtml">&lt;i&gt;Annals of Forest Science&lt;/i&gt;, 2011, 68 (7), pp.1255-1264. &lt;a target="_blank" href="https://dx.doi.org/10.1007/s13595-011-0065-3"&gt;&amp;#x27E8;10.1007/s13595-011-0065-3&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Sap flow measurements by thermal dissipation method using cyclic heating: a processing method accounting for the non-stationary regime</title>
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                <idno type="issn">1286-4560</idno>
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                <title level="j">Annals of Forest Science</title>
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                <term xml:lang="en">ERROR CORRECTION</term>
                <term xml:lang="en">SILVER FIR</term>
                <term xml:lang="en">SAPIN ARGENTE</term>
                <term xml:lang="en">DISSIPATION THERMIQUE</term>
                <term xml:lang="en">CYCLIC HEATING</term>
                <term xml:lang="en">THERMAL DISSIPATION METHOD</term>
                <term xml:lang="en">SAP FLOW</term>
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              <classCode scheme="halDomain" n="sdv.sa.sf">Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry</classCode>
              <classCode scheme="vocinrae-old" n="arbre forestier">arbre forestier</classCode>
              <classCode scheme="vocinrae-old" n="résineux">résineux</classCode>
              <classCode scheme="vocinrae-old" n="abies alba">abies alba</classCode>
              <classCode scheme="vocinrae-old" n="bilan thermique">bilan thermique</classCode>
              <classCode scheme="vocinrae-old" n="mesure physique">mesure physique</classCode>
              <classCode scheme="vocinrae-old" n="méthode de mesure">méthode de mesure</classCode>
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              <p>Context : 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. Aim: 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. Methods: 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. Results: 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). Conclusion: 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</p>
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