School;
of;
Geography,;
South;
China;
Normal;
University,;
Guangzhou;
510631,;
China;
State;
Key;
Laboratory;
of;
Loess;
and;
Quaternary;
Geology,;
Institute;
of;
Earth;
Environment,;
CAS,;
Xi'an;
710061,;
China;
Department;
of;
Geography,;
Jiaying;
University,;
Meizhou;
514015,;
China;
Cold;
and;
Arid;
Regions;
Environmental;
and;
Engineering;
Research;
Institute,;
CAS,;
Lanzhou;
730000,;
China;
Department;
of;
Geography;
and;
Geology,;
the;
University;
of;
Hong;
Kong,;
Hong;
Kong,;
China;