The transition from forest to treeless tundra on a mountain slope is often a dramatic one.

从森林到山坡上没有树木的苔原的过渡通常会十分突然和明显。

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A mostly cold and barren world of steppes and tundra, with vast frozen regions and glaciated mountain ranges.

在这个寒冷贫瘠的世界上，绝大部分地貌是干草原、苔原、大片冻土和冰川山脉。

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Bryoflora of the alpine tundra of Changbai Mountain and its floristic relationship to the...

长白山高山冻原苔藓植物区系及其与北极冻原苔藓植物区系的关系。

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The episode is known as the Younger Dryas, because in Scandinavia abundant pollen from a tundra flower called the mountain avens, Dryas octopetala, reappears in soil from this date, indicating that the forest had once more given way to tundra.

WSJ: Matt Ridley on New Support for a Global-Cooling Theory | Mind & Matter