Acknowledgments
We gratefully acknowledge Karin Schmidt, Anita Kriegel, Susann Enzmann
and Ingrid Ostermeyer for their careful help with laboratory and
fieldwork. We thank the Laboratory for Radioisotopes (LARI) and Centre
for Stable Isotope Research and Analysis (KOSI) of the University of
Göttingen. We would also like to thank China Scholarship Council for the
fellowship for Yue Sun and Huadong Zang, and the DAAD scholarship award
to Amit Kumar.