Radial sap flow measurements on beech, Douglas fir and spruce using heat field deformation sap flow sensor

This dataset contains sap flux measurements derived from Heat Field Deformation (HFD) sensors, which were installed in European beech (Fagus sylvatica), Norway spruce (Picea abies), and Douglas fir (Pseudotsuga menziesii) trees. The HFD method is an advanced thermal technique used to quantify tree sap flow, providing high-resolution estimates of xylem water flux density and whole-tree transpiration.
The dataset includes sensor depth, tree diameter, species identity, sapwood characteristics, xylem radius, and calculated sap flux values for each monitored tree. Measurements were taken continuously to assess water use patterns across different tree species and stand types under varying moisture conditions.
HFD sensors are particularly valuable because they:
Allow direct, continuous measurement of sap flow at multiple radial depths,
Capture diurnal and seasonal variability in transpiration,
Provide species-specific insights into water use efficiency and drought response, and
Support the upscaling of tree-level fluxes to stand-level transpiration for ecohydrological modeling.