Acknowledgements:
The project was funded through Waldlabor Project Grant 4.20.P01 awarded
to Marius Floriancic. We thank the Waldlabor Zürich (Martin Brüllhardt
– www.waldlabor.ch) as well as the forest owner Jakob Heusser for their
cooperation and support. We acknowledge support during data collection
and laboratory work from the technical staff and student helpers working
at the Waldlabor ecohydrology field site (Lena Straumann, Anna Lena
Könz, Maria Grundmann, Lara Virsik, Elisa Hage, Stefano Martinetti,
Fabian Strittmatter, Adrian Kreiner, Livio Steiger and Lucien Biolley).
We thank Tracy Napitupulu and Björn Studer for isotope analyses and
Annika Ackermann, Roland A. Werner and Nina Buchmann for sharing the
cryogenic extraction laboratory.