Overgrazing Untimely grazing (early or late grazing) Conversion of rangelands into other uses Fire and drought Human activities Collecting fuel wood (range plants and shrubs) Overpopulation Overexploitation of groundwater reserves
过度放牧 不适时放牧 将牧场用于其他用途 火灾和干旱 人类的活动 拾柴 人口过剩 过度开采地下水储备