Laboratory;
of;
Western;
China's;
Environmental;
Systems;
(MOE),;
Lanzhou;
University,;
Lanzhou;
730000,;
China;
Key;
Laboratory;
of;
Cryospheric;
Sciences,;
Cold;
and;
Arid;
Regions;
Environmental;
and;
Engineering;
Research;
Institute,;
Chinese;
Academy;
of;
Sciences,;
Lanzhou;
730000,;
China;
黄河上游; 径流量; 树木年轮; 干旱现象; 阿尼玛卿山; 低流量; 年轮宽度; 普氏原羚;