Acknowledgements
This study was partially supported by the Northeast Institute of
Geography and Agroecology, Chinese Academy of Sciences, and the “Top
Notch” program in China. C.S. is supported by the National Natural
Science Foundation of China (41125001). L.Z. was partially supported by
National Key Research and Development Program of China (2016YFC0500601)
and the National Natural Science Foundation of China (41371111). X.X.
acknowledged the financial assistance provided by the SPRUCE and NGEE
Arctic projects, which are supported by the Office of Biological and
Environmental Research in the Department of Energy Office of Science.
J.B. was partially supported by the Interdisciplinary Research Funds of
Beijing Normal University. I.A.J. acknowledge support from the European
Research Council Synergy Grant IMBALANCE-P (ERC-2013-SyG-610028). Dr.
Natalie M. Mahowald at Cornell University kindly shared her data of
global depositions of N and P for this study.