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Croissance, production et acquisition de l'azote chez le peuplier et le robinier en plantations à courte rotation monospécifiques et mélangées

Abstract : Biomass from short rotation coppice (SRC) plantations may help reducing fossil fuel consumption. The development of mixed-species plantations, introducing a nitrogen-fixing species could be a solution to reduce the risk of fertility decline in SRC. Nevertheless, the success or failure of the mixture will depend on the competition and complementarity processes, for light and soil resources (water and nutrients), between both species. The objectives of this study were to determine the impact of a mixture of poplar and black locust, on growth, biomass production and nitrogen uptake in the plantation. Instrumented monocultures and mixed plantations of both species have been studied during four years. Repeated above-and belowground biomass estimations associated with tree dimension monitoring have shown that the presence of black locust affected neither growth, nor biomass production and allocation of poplar trees both at tree and plot level. On the other hand, the black locusts trees suffered from interspecific competition: high mortality, decrease in growth and biomass production. Moreover, an isotopic approach (15N) coupled with mineralomass analyses allowed to highlight that nitrogen concentration in black locust trees in the mixture was lower than in the monoculture due to a reduction of the percentage of nitrogen derived from atmospheric fixation. The total nitrogen contents were close in the mixture and in the monocultures of each species. No advantage of the mixture was found during the study period because of inappropriate pedoclimatic conditions (especially for the black locust) and incompatibility between both species on this site
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Cécilia Gana. Croissance, production et acquisition de l'azote chez le peuplier et le robinier en plantations à courte rotation monospécifiques et mélangées. Sylviculture, foresterie. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0010⟩. ⟨tel-01752224⟩

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