High altitude ecology: Experiments concerning causes of timber line — A progress report

[First paragraph...]
Experiments are being carried out on the Craigieburn Range (in Canterbury, New Zealand) with mountain beech (Nothofagus solandri var. cliffortioides), which is the local timber line species, and with timber line species from other parts of the world. The aims are to compare growth at different altitudes, to demonstrate symptoms of failure in seedlings set out above their natural limit, and to show whether timber lines in New Zealand are climatically equivalent to those in other lands.