Gebhardt, Timo;Hesse, Benjamin D.;Hikino, Kyohsuke;Kolovrat, Katarina;Hafner, Benjamin D.;Grams, Thorsten E.E.;Häberle, Karl-Heinz Repeated summer drought changes the radial xylem sap flow profile in mature Norway spruce but not in European beech Agricultural and Forest Meteorology 2023 329 109285