Funding for this research was provided by:
National Key Research and Development Program of China (2016YFA0602703)
National Natural Science Foundation of China (41575001)
State Key Laboratory of Earth Surface Processes and Resource Ecology (2017-FX-03)
Scientific Research Foundation Beijing Normal University (2015KJJCA14)
National Key Research and Development Program of China (2018YFC1509003)
Article History
Received: 23 October 2018
Accepted: 21 January 2019
First Online: 13 February 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.