The wetter snow associated with warmer temperatures in recent years causes a frozen crust to form over the plants, which the reindeer can't break through.
最近几年，与较高温度相关较湿的雪地导致了在这些植物上面形成一层冷冻外壳，而驯鹿却无法打破这层外壳。
2
The plants in the plateau areas and the melting soil-layers in the frozen are all affected by the climatical conditions and interaction each other.