1·It is this thin layer of active soil that supports all living things on the tundra.
正是这被太阳晒暖的苏醒过来的薄薄的一层土壤养活着冻土带上的一切生物。
2·Tundra burning may also release more organic carbon, a greenhouse gas currently stored in the soil, into the atmosphere.
苔原燃烧也可能释放出更多的有机的碳,二氧化碳目前储存在土壤中,这样将会到大气层中。
3·Ice wedges penetrate deep into frozen soil, chiseling tundra into room-size polygon-a signature texture of permafrost landscapes.
冰楔可以深深穿入冰冻的土壤,将冻原雕凿成一个个如房间大小的多角地裂块,是永冻层景观的一个特征。