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Decadal-scale vegetation dynamics above the alpine treeline, Mount Rufus, Tasmania

Citation

Harrison-Day, V and Annandale, B and Balmer, J and Kirkpatrick, JB, Decadal-scale vegetation dynamics above the alpine treeline, Mount Rufus, Tasmania, Papers and Proceedings of the Royal Society of Tasmania, 150, (2) pp. 9-18. ISSN 0080-4703 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Royal Society of Tasmania

Official URL: http://rst.org.au/publications/papers-and-proceedi...

Abstract

Alpine areas by definition have summer temperatures too cool to support trees. Concerns have been raised that trees may invade these distinctive habitats where global climate change results in an increase in summer temperatures beyond the threshold limiting tree growth. In 2016, we investigated changes in the treeline and vegetation immediately above it by resampling quadrats and rephotographing from the set points established in the Alpine Treeline Ecotone Monitoring Program on Mount Rufus, Tasmania, in 2006. Within the study area, the only species with the potential to reach a tree height > 3 m is Eucalyptus coccifera Hook.f. The height, density, basal diameter and diameter at breast height were recorded for all E. coccifera within the study area, together with an estimate of percentage cover of each vascular plant species. No change was found in the location of the treeline over the 10-year period, although E. coccifera height and density above the treeline did increase. The vegetation on the north-facing slope shifted to a composition more closely related to the forest below the treeline, while on the south-facing slope forest species reduced in abundance and the vegetation became more dominated by alpine species. Historical aerial photographs suggest that there has been a minor and inconsistent establishment of E. coccifera plants at higher altitudes since 1953. The area was burned by bushfire in 1965, making it difficult to separate the effects of putative climate change and recovery after the fire event on vegetation changes, although data from Lake St Clair suggest a local constancy of mean growing season temperatures and rainfall.

Item Details

Item Type:Refereed Article
Keywords:climate change, fire, subalpine forest, tree growth, tree mortality, Eucalyptus coccifera, snow, alpine vegetation
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Flora, Fauna and Biodiversity of environments not elsewhere classified
Author:Harrison-Day, V (Ms Violet Harrison-Day)
Author:Annandale, B (Mr Bryan Annandale)
Author:Balmer, J (Ms Jayne Balmer)
Author:Kirkpatrick, JB (Professor James Kirkpatrick)
ID Code:114220
Year Published:2016
Deposited By:Geography and Spatial Science
Deposited On:2017-02-08
Last Modified:2017-11-03
Downloads:0

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