Institute;
of;
Geographic;
Sciences;
and;
Natural;
Resources;
Research,;
CAS,;
Beijing;
100101,;
China;
Graduate;
School;
of;
the;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100039,;
China;
Institute;
of;
Tibetan;
Plateau;
Research,;
CAS,;
Beijing;
100085,;
China;
珠穆朗玛峰自然保护区; 植被变化; 20世纪晚叶; 植被退化; AVHRR; 喜马拉雅山地区;