草场的增加和随之而来的过度放牧导致了稀树草原的扩张。
Increase in pastureland and subsequent overgrazing have resulted in an expansion of savanna.
今后，应该大力发展以皮燕麦为主的人工草场生产，减轻由于过度放牧对天然草场的压力，恢复和保护高原脆弱的生态环境。
Thus we should develop the artificial grassland in this area in order to alleviate over-feed stress for nature grassland and to restoration and protection the frail eco-environment in this plateau.
放牧的草场越来越少而过度放牧引起土壤的流失。
Grazing land is scarce while overgrazing causes soil erosion.
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