An empirical study of the wound effect on sap flux density measured with thermal dissipation probes - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Tree Physiology Year : 2016

An empirical study of the wound effect on sap flux density measured with thermal dissipation probes

Abstract

The insertion of thermal dissipation (TD) sensors on tree stems for sap flux density (SFD) measurements can lead to SFD underes- timations due to a wound formation close to the drill hole. However, the wound effect has not been assessed experimentally for this method yet. Here, we propose an empirical approach to investigate the effect of the wound healing on measured sap flux with TD probes. The approach was performed for both, diffuse-porous (Fagus sylvatica (Linnaeus)) and ring-porous (Quercus pet- raea (Lieblein)) species. Thermal dissipation probes were installed on different dates along the growing season to document the effects of the dynamic wound formation. The trees were cut in autumn and additional sensors were installed in the cut stems, therefore, without potential effects of wound development. A range of water pressures was applied to the stem segments and SFDs were simultaneously measured by TD sensors as well as gravimetrically in the laboratory. The formation of wounds around sensors installed in living tree stems led to underestimation of SFD by 21.4 ± 3 and 47.5 ± 3.8% in beech and oak, respectively. The differences between SFD underestimations of diffuse-porous beech and ring-porous oak were, however, not statistically sig- nificant. Sensors with 5-, 11- and 22-week-old wounds also showed no significant differences, which implies that the influence of wound formation on SFD estimates was completed within the first few weeks after perforation. These results were confirmed by time courses of SFD measurements in the field. Field SFD values decreased immediately after sensor installation and reached stable values after ~2 weeks with similar underestimations to the ones observed in the laboratory. We therefore propose a feas- ible approach to correct directly field observations of SFD for potential underestimations due to the wound effect.

Dates and versions

hal-02641483 , version 1 (28-05-2020)

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Andreas Wiedemann, Sara Marañón Jiménez, Corinna Rebmann, Mathias Herbst, Matthias Cuntz. An empirical study of the wound effect on sap flux density measured with thermal dissipation probes. Tree Physiology, 2016, 36 (12), pp.1471-1484. ⟨10.1093/treephys/tpw071⟩. ⟨hal-02641483⟩

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