Growth,nitrogen accumulation,and symbiotic dinitrogen fixation in pure and mixed plantings of hybrid poplar and black alder |
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Authors: | B Coté C Camire |
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Institution: | (1) Départment d'Ecologie et de Pédologie, Faculté de Foresterie et de Géodésie, Université Laval, G1K 7P4, Québec, Canada |
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Abstract: | Summary Growth and N accumulation were assessed in pure and mixed plantings (2 years old) of hybrid poplar and black alder in southern Québec. Symbiotic dinitrogen fixation was evaluated by natural15N dilution. Growth of hybrid poplar plants and N accumulation in their tissues increased with their decreasing contribution to species ratio whereas no differences among treatments were measured for black alder. Yield and N content per hectare of aboveground components increased with the proportion of black alder in the plantation. Symbiotic dinitrogen fixation was estimated at 68% of alder nitrogen in both pure and mixed treatments. The maximum rate of N-fixation was 53kg ha–1 yr–1 in pure alder plots. The amount of nitrogen accumulated in entire plants of black alder from symbiotic fixation could be sufficient to balance the N export in harvested stems and branches of short-rotation plantations containing at least 33% of alder. |
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Keywords: | Black alder Hybrid poplar Interactions Natural 15N dilution N2 fixation N accumulation Short-rotation plantation Tree biomass |
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