[ACG47-P06] Artificial sap flow measured by heat field deformation and heat ratio methods in the laboratory
Keywords:artificial sap flow, calibration, heat field deformation method, heat ratio method
We sampled four stems from four Japanese cedars planted in the nursery of Forestry and Forest Products Research Institute, Japan. Their ages are 12 years, tree height was from 9.0 to 10.0 m and diameter at breast height was from 10.9 to 12.5 cm. The width of active sapwood was about 3 to 4 cm. We used sensors of HR and HFD manufactured by ICT international Pty Ltd (type SFM1 and HFD8, respectively) and another HR measurement system developed by Kominami et al. (2016). Outputs of HR and HFD showed clear correlations with the vacuum pressure, indicating the basic availability of these methods to measure activities of sap flow for Japanese cedar as suggested by Iida et al. (2015; 2016). At the presentation, we will show the radial and azimuthal variations in sap flow generated by the equipment (Shinohara et al., 2016) and will analyze the effect of some corrections related to calculations of heat pulse velocity for HR. We will also provide the results of comparisons between the artificial sap flux density and that calculated by the equation proposed for HFD (Nadezhdina et al., 2012).
Burgess, 2001. Tree Physiol., 21:589–598.
Granier, 1985. Ann. Sci. For., 42: 193–200. [English translation, in Evaporation, Benchmark Papers in Hydrology 2. Gash JHC, Shuttleworth, WJ (eds). IAHS Press: Oxfordshire; 61–63].
Iida et al., 2015. J. Japanese Assoc. Hydro. Sci., 45, 89-94.
Iida et al., 2016. JpGU Meeting 2016, ACG22-P01.
Kominami et al. 2016. Proc. Japanese For. Soc. Congress, 127, S6-5.
Kumagai et al., 2014. J. Hydrol., 508: 66-76.
Nadezhdina et al., 2012. Trees, 26:1439–1448.
Shinohara et al. 2016. ESJ63 Abstract, P2-069.