Rocky Mountain birch 岩石山白桦木
mountain birch 高原桦
mountain paper birch 山纸桦
The mountain forest coverage rate is 36.56% , main species including birch , poplars , lime tree .
关山的森林覆盖率达到了36.56%以上，主要树种包括：桦树、白杨树、椴树。
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