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。