Grassland overload was not significant in the old days in Tibet, because of stagnant population growth, frequent natural calamities, and massive human and livestock deaths in times of snowstorms and other natural disasters.

• 在旧西藏，由于人口增长处于停滞状态，自然灾害频繁，每逢雪灾等天灾来临，往往造成大量人畜死亡，草场超载现象并不突出。