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Forestry Advance Access originally published online on January 27, 2009
Forestry 2009 82(2):199-210; doi:10.1093/forestry/cpn054
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Published by Oxford University Press on behalf of Institute of Chartered Foresters, 2009. For Permissions, please email: journals.permissions@oxfordjournals.org
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Side shelter on lowland sites can benefit early growth of ash (Fraxinus excelsior L.) and sycamore (Acer pseudoplatanus L.)

Ian Willoughby*, Victoria Stokes and Gary Kerr

Forest Research, Forestry Commission, Alice Holt Lodge, Farnham, Surrey, GU10 4LH, UK

* Corresponding author. E-mail: ian.willoughby{at}forestry.gsi.gov.uk


  Abstract

The influence of side shelter on the growth of newly planted ash (Fraxinus excelsior L.) and sycamore (Acer pseudoplatanus L.) was investigated at a lowland site in Britain. Although tatter flag analysis classified the site as ‘very sheltered’ in comparison to upland sites, after three years, both species benefited to some degree from the provision of shelter, with height increment being improved by up to two to four times. The most effective shelter was provided by a wall of straw bales. Plastic netting also reduced exposure, but required regular maintenance in winter months. Our work suggests that on equivalent sites in southern Britain, where mean daily tatter rates of more than 2.4 cm2 day–1 (equivalent to windiness scores of greater than 10.3) occur, without side shelter, severe suppression of height growth in ash and sycamore is likely, and that exposure to wind is likely to be a significant cause of this reduction in growth. Currently, using artificial shelter materials on a large scale on lowland sites solely to improve early tree growth is unlikely to be cost-effective in most cases. However, the provision of side shelter, particularly through use of nurse species, is likely to become an increasingly important silvicultural consideration in the future.

Received 9 April 2008.
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