Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > TERRESTRIAL ECOSYSTEMS > MONTANE HABITATS

Definition:
The zone in mountainous regions where the influence of altitude (vertical relief) results in local climatic regimes that are sufficiently different from those in the adjacent lowlands as to cause a complex vertical climate-vegetation-soil zonation.

Reference:
The Nature Conservancy Glossary of Terms Used in the US National Vegetation Classification Hierarchy, 1998