「The vegetation and soils in most of the arid and semiarid zones have been degraded, usually by overgrazing and the removal of plant cover by fire or the axe. 」
大多数干燥和半干燥地带的植被和土壤严重退化,其原因通常是过度放牧及滥砍滥伐和火灾。
The vegetation and soils in most of the arid and semiarid zones have been degraded, usually by overgrazing and the removal of plant cover by fire or the axe.