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Alder-Frankia interaction and alder-poplar association for biomass production
Authors:E Teissier du Cros  G Jung  M Bariteau
Institution:(1) Station d'Amélioration des Arbres Forestiers, INRA, Ardon, F-45160 Olivet, France;(2) Rhône-Poulenc, Centre de Recherches de la Croix de Berny, 182-184, avenue Aristide Briand, F-92160 Antony, France;(3) Service technique biomasse, INRA, Ardon, F-45160 Olivet, France
Abstract:Summary Alders have an important role to play in biomass producing stands because of their N2-fixing ability and their capacity to withstand soils having an excess of moisture. The objectives of preliminary trials were (1) to find if there is any alder-genotype xFrankia-strain interaction when the effect of inoculating the bacteria was compared to no inoculation in seed beds of different species and provenances of alder, (2) to measure the possible effect of black alders interplanted in poplars compared to pure poplar plots. Two trials were laid out to study the alder-Frankia interaction. Both produced interaction. In the first one the inoculation had a favorable effect onAlnus glutinosa at age 2 years andA. cordata at age 1 and 2 and no effect onA. rubra. In the second one the inoculation had a depressive effect at age 1 on 2 of 3 provenances ofA. rubra and no effect on 1A. rubra, 3A.glutinosa and 3A. cordata provenances.A closely spaced field trial associating one black alder provenance and the poplar clone UNAL gives no superiority of mixed plots compared to pure plots. The results suggest that the N2-fixation of alders is not profitable to poplars at age 3 with a 1.5×2 m spacing.
Keywords:Alnus  Frankia  N2-fixation  Mixed stands  Populus
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