Mechanisms of degradation in grazed rangelands.

This chapter describes the mechanisms of degradation in grazed rangelands (loss of perennial grasses and shrubs), invasion by toxic and unpalatable plants, rodent outbreaks and the impact of periodic prolonged drought on plant growth and survival under intense grazing pressure. The components of the grazing systems in China's rangelands are outlined. The question of whether better grazing management is a dream or an economic and ecological imperative is also considered.