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Nitrogen uptake and utilization by slow- and fast-growing families of interior spruce under contrasting fertility regimes

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Six full-sib families of interior spruce (Picea glauca (Moench) Voss × Picea engelmannii Parry ex Engelm.) of contrasting growth rates (three fast-growing, three slow-growing families) were grown from seed in a greenhouse under three fertility regimes (25, 75, and 125 mg nitrogen/seedling over 175 days). The use of vector analysis showed that the lowest fertility regime was nitrogen-limited while the highest indicated luxury consumption. After 175 days, fast-growing families were larger than slow-growing at all fertility levels. At the lowest fertility level, fast-growing families exhibited greater nitrogen productivity and utilization of internal nitrogen. At higher fertility levels, fast-growing families took up nitrogen more quickly and efficiently thus accumulating greater nitrogen reserves. Fast-growing families also exhibited a greater plasticity in dry mass allocation between shoots and roots with different fertility levels.

Six fratries d'épinette de l'intérieur (Picea glauca (Moench) Voss × Picea engelmannii Parry ex Engelm.) ayant des taux de croissance différents (trois fratries à croissance rapide et trois fratries à croissance lente) ont été cultivées en serre à partir de graines et soumis à trois régimes de fertilité (25, 75 et 125 mg d'azote par semis pendant une période de 175 jours). L'analyse vectorielle montre que le régime de fertilité le plus bas cause une déficience en azote alors que le plus haut entraîne une consommation de luxe. Après 175 jours, les plants des fratries à croissance rapide étaient plus développés que ceux des fratries à croissance lente à tous les niveaux de fertilité. Au niveau de fertilité le plus faible, les fratries à croissance rapide manifestaient une plus forte productivité par rapport à l'azote et une plus grande utilisation de l'azote interne. Aux niveaux de fertilité plus élevés, les fratries à croissance rapide absorbaient l'azote plus rapidement et plus efficacement accumulant ainsi de plus importantes réserves d'azote. Les fratries à croissance rapide manifestaient également une plus grande plasticité dans l'allocation en poids sec entre les pousses et les racines à différents niveaux de fertilité.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-06-01

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