1. Chair of Tree Physiology, Institute of Forest Sciences, University of Freiburg, Georges-Köhler-Allee 53/54, 79110 Freiburg, Germany
2. Zentralstelle der Forstverwaltung, Forschungsanstalt für Waldökologie und Forstwirtschaft, Hauptstraße 16, 67705 Trippstadt, Germany
3. Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Kreuzeckbahnstrasse 19, Garmisch-Partenkirchen 82467, Germany
4. King Saud University, PO Box 2454, Riyadh 11451, Saudi Arabia
5. Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University No. 2, Tiansheng Road, Beibei District, 400715 Chongqing, P.R. China