File:Tree_line_above_St._Moritz.jpg · Wikimedia Commons · See Wikimedia Commons
tree line
Sign in to saveAlso known as treeline, tree lines, timberline
edge of the habitat at which trees are capable of growing
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Tree line above St. Moritz, Switzerland. May 2009 In this view of an alpine tree line, the distant line looks particularly sharp. The foreground shows the transition from trees to no trees. These trees are stunted in growth and one-sided because of cold and constant wind.
The tree line is the edge of a habitat at which trees can grow and beyond which they cannot. It is found at high elevations and high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions (usually low temperatures, extreme snowpack, or associated lack of available moisture). The tree line is sometimes distinguished from a lower timberline, which is the line below which trees form a forest with a closed canopy.