The topographic condition greatly changes and climate is worst in frigid and arid region, thus vegetation restoration of railway slope is a more complicated project in these regions.

• 寒旱地区由于地貌高差悬殊,垂直气候差异鲜明,气候恶劣,生态环境极其敏感脆弱,其铁路边坡植被恢复更是一项复杂的工程。