But ,the disturbances from human destroyed the ecological environment of elm woodland steppe seriously and influenced its special ecological function.

• 然而 ,由于人类的干扰 (如毁林开荒、过度放牧、甚至片面地建立人工林群落等 ) ,不同程度地破坏了榆树疏林的生态环境 ,影响了其特有的生态作用。