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This poster by Edward Wilson and Philippe Morgan was first presented at the Society of American Foresters National Convention, Silviculture Matters!, North Charleston, South Carolina, 23-27 October 2013.
The poster presents an overview of the Glentress Trial, at Glentress Forest, Scotland. The trial was established by Professor M. L. Anderson in 1952 as a demonstration area for the transformation to an irregular structure of an even-aged, planted forest. The trial area (117 ha) was set out in a large commercial plantation on an exposed, upland site (~300 m); Anderson wanted to determine if uneven-aged silvicultural systems could be adopted in such locations. The dominant species include Sitka spruce, Douglas fir, European larch and Scots pine. The most important silvicultural system that has been applied is group selection, with group sizes varying from 0.1 to 0.2 ha. Groups have been restocked by planting and natural regeneration. Recent surveys of the trial area demonstrate the gradual transformation to an irregular structure after 60 years. The Glentress Trial is recognised as one of the longest-running research sites in British forestry. The trial has been important for both primary research and for developing operational experience in uneven-aged silviculture. Over the decades since its initiation, the objectives of forestry in Britain have evolved and changed. Today the Glentress Trial has a new relevance as we recognise the importance of uneven-aged forests for their ecological resilience and potential to deliver a wide range of ecosystem services.