Hybrid poplars: present status and potential in Britain |
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Authors: | TABBUSH P; BEATON A |
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Institution: | 1Forest Research, Alice Holt Lodge Farnham, Surrey GU10 4LH, England
2 Pot Common, Redhouse Lane, Elstead, Godalming, Surrey, England |
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Abstract: | Past and potential future use of hybrid poplars for wood productionin Britain is considered, and preliminary results of trialswith new clones imported from Belgium in 1985 are given. A seriesof nine field experiments established in 1991, to a common protocol,was analysed using stepwise multiple regression. The superiorvigour of Beaupré compared with Ghoy,Robusta and Trichobel was clearin almost every case. For Beaupré (Populustrichocarpa x P. deltoides) altitude emerged as the variableexplaining most variation in tree height after six growing seasons,height declining with increasing altitude. The four best siteswere characterized by low elevation and low rainfall. At the two older sites planted in 1987, at Ampthill and Bedgebury,the interamerican hybrids (P. trichocarpa x P.deltoides) were the most vigorous, and the clones Unaland Raspalje, which were thought to be too rustsusceptible to release for commercial use in 1990, achievedsimilar stem sizes to those of Beaupréand Bolelare. The General Yield Class (based ona reference spacing of 8 x 8 m) calculated for Beaupréwas 8 at Ampthill and 24 at Bedgebury. Future prospects for poplar planting are considered in relationto possible reform of the Common Agricultural Policy. |
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