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Parameter Tree:
EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > ALPINE/TUNDRA
Definition:
Habitat found in the zone on mountain tops between permanent snow and the
cold limits of trees, or in arctic regions, characterized by very low
winter temperatures, short cool summers, permafrost below a surface layer
subject to summer melt, short growing season, and low precipitation. 
Reference:
The Nature Conservancy
Glossary of Terms Used in the US National Vegetation
Classificaion Hierarchy, 1998
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