The authors are grateful for the comments and contributions of the editors, anonymous reviewers and the members of the editorial team. This work was supported by the [National Natural Science Foundation of China (NSFC)] under Grant [41771493], [41101407]; [Wuhan Youth Science and Technology Plan] under Grant [2016070204010137]; [National Key Research and Development Program] under Grant [2016YFC0503506]; [Hubei Soil and Water Conservation Monitoring Research]; and [self-determined research funds of CCNU from the basic research and operation of MOE] under Grant [CCNU19TS002].