Eight clones of poplar were used to compare the growth and productivity of monoclonal and polyclonal mixed plantations in short-rotation coppice. At the end of the eighth growing season, the diameter at breast height (DBH) and height of trees were measured and dry weight and yield were estimated. Polyclonal mixtures did not affect mortality. Few differences in growth were observed between clones in monoclonal plots. Polyclonal mixture slightly affected the growth and tree size of the clones compared with monoclonal plots. No increase in stand heterogeneity in relation to clone deployment was observed. A neighbourhood index was calculated for each tree and was significantly affected by polyclonal mixture. However, the relationship between the neighbourhood index and the DBH indicated that this effect did not cause a great change in DBH. Consequently, dry weight and yield productivity were not affected by clone deployment.
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Document Type: Research Article
Unité Agroforesterie et forêt Paysanne, INRA centre de Toulouse, BP 27, 31326 Castanet-Tolosan Cédex, France
Unite´ d'Amélioration des arbres forestiers, INRA centre d'Orléans, 45160 Ardon, France
Publication date: 2000-12-01
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