1. University of Applied Forest Sciences Rottenburg, Schadenweilerhof, Rottenburg a. N. 72108, Germany
2. Technology and Support Center in the Center of Excellence for Renewable Resources, Schulgasse 18, Straubing 94315, Germany
3. SPECTRO Analytical Instruments GmbH, Boschstraße 10, Kleve 47533, Germany
4. Bavarian State Institute of Forestry, Hans-Carl-von-Carlowitz-Platz 1, Freising 85354, Germany
5. University Tübingen, Schnarrenbergstrasse 94-96, Tübingen 72076, Germany