Skip Navigation


Forestry Advance Access originally published online on September 5, 2008
Forestry 2008 81(5):631-644; doi:10.1093/forestry/cpn036
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
81/5/631    most recent
cpn036v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Clark, J.R.
Right arrow Articles by Savill, P.S.
Right arrow Search for Related Content
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© Institute of Chartered Foresters, 2008. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Early growth and form of common walnut (Juglans regia L.) in mixture with tree and shrub nurse species in southern England

J.R. Clark1, G.E. Hemery2,* and P.S. Savill3

1 Northmoor Trust, Little Wittenham, Abingdon, Oxfordshire OX14 4QZ, England
2 Forestry Horizons, Manor House, Little Wittenham, Oxfordshire OX14 4RA, England
3 Department of Plant Sciences, Oxford Forestry Institute, University of Oxford, Oxford OX1 3RB, England

* Corresponding author. E-mail: g.hemery{at}forestryhorizons.eu


  Abstract

Common walnut (Juglans regia L.) is usually grown in pure stands or as individual trees, rather than within mixed woodlands. Previous studies indicate that walnut can benefit from being planted in mixed stands, particularly with nitrogen-fixing (N-fixing) species. The effects of establishing walnut with various combinations of tree and shrub nurse species were investigated, including those capable of fixing nitrogen. After 6 years, walnut survival exceeded 99 per cent. Tree nurses did not significantly effect walnut growth; however, walnut height growth with autumn olive (Elaeagnus umbellata Thunb.) was significantly greater (P < 0.05), with an average increment of 17 cm year–1 across all sites at year six and 32 cm year–1 at one site at year seven. The architecture (height, width and estimated volume) of Corylus avellana L. and E. umbellata had a significant positive (P < 0.05) effect on walnut height. Foliar nitrogen levels for walnuts with at least one N-fixing nurse were within the reported optimal range, whereas those walnuts in control plots were deficient in nitrogen. Walnut trees grown with E. umbellata also had fewer multiple stems and finer branches. The results indicate that there are significant early benefits from establishing walnut with E. umbellata.

Received 17 August 2007.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.