**Acknowledgements**

This work was financially supported by Key Program of National Natural Science Foundation of China (Grant No.41730749), CAS Key Technology Talent and Key Research Program of the Chinese Academy of Sciences (grant no. KJZD-EW-TZ-G10). The authors like to thank the personnel of the Key Laboratory of Water Cycle and Related Land Surface Processes, Chinese Academy of Sciences, for providing important ideas in construction of field experimental stations and indoor experimental laboratory.
