This is because middle- and upper- latitude timberlines are strongly influenced by the duration and depth of the snow cover.
这是因为中纬度和高纬度地区的林木线受到积雪存留时间和厚度的强烈影响。
Arctic: a region between the north Pole and the northern timberlines of North America and Eurasia.
北极地区：在北极与北美洲和欧亚大陆北部林木线之间区域。
Arctic: a region between the north Pole and the northern timberlines of North America and Eurasia.
北极地区：在北极与北美洲和欧亚大陆北部林木线之间区域。
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