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  • Croissance  (2)
  • Dinitrogen fixation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Comportement dePicea abies Karst. en plantation au Québec, Canada (1983)
    Springer
    Plant and soil 73 (1983), S. 3-16 
    Details
    ISSN: 1573-5036
    Keywords: Croissance ; Eléments nutritifs ; Picea abies ; Plantation ; Sol Station ; Texture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Abstract A soil-site-growth study was undertaken in 94Picea abies plantations ranging in age from 20–31 years, in the L-3 forest region, Canada. Correlation analysis and canonical variable analysis indicated positive relationships between growth and the level of exchangeable cations (K, Ca, Mg, and Mn), total nitrogen, cation exchange capacity, pH, percentages of fine particles, altitude and slope. By stepwise discriminant analysis, 65% of the sites were correctly classified according to predetermined growth classes with the four first parameters (exchangeable Mn, % of fine sand, exposition and pH) in the equation. Seventy-six percent of the sites were correctly classified using total soil and site characteristics.
    Notes: Résumé Une étude sol-station-croissance a été effectuée sur 94 plantations dePicea abies, âgées de 20–31 ans, dans la région forestière L-3, Canada. Des relations positives ont été mises en évidence, par l'analyse de corrélation et l'analyse des viariables canoniques, entre la croissance et les teneurs en cations échangeables (K, Ca, Mg et Mn), l'azote total, la capacité d'échange cationique, le pH, les pourcentages de particules fines, l'altitude et la pente. L'analyse discriminante progressive permet, en moyenne, de classer correctement 64% des stations au sein des classes de croissance prédéterminées, en utilisant les quatre premiers paramètres (teneur en Mn échangeable, % de sable fin, exposition (cos) et pH) à entrer dans l'équation de classement. L'ensemble des paramètres échantillonnés classe correctement 76% des stations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197752
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  • 2
    Electronic Resource
    Electronic Resource
    Comportement dePicea abies Karst. en plantation au Québec, Canada (1983)
    Springer
    Plant and soil 73 (1983), S. 17-26 
    Details
    ISSN: 1573-5036
    Keywords: Azote ; Croissance ; Nutrition ; Picea abies ; Plantation ; Potassium ; Sol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Abstract A nutrient-growth study was undertaken in 94Picea abies plantations, ranging in age from 20–31 years, in the L-3 forest region, Canada. Correlation analysis and canonical variable analysis indicated a positive relation between growth and the percentage of nitrogen and potassium in needles of the current year growth. By stepwise discriminant analysis, these two elements classify correctly 53% of the sites in the predetermined growth classes whereas combining all foliar characteristics tested classified correctly 59% of the sites. Adequate nitrogen and potassium nutrition is observed on plantations grown on soils with high levels of exchangeable cations and rich in silt and clay.
    Notes: Résumé Une étude nutrition-croissance a été réalisée dans 94 plantations dePicea abies, âgées de 20–31 ans, établies dans la région forestière L-3, Canada. Des relations positives ont été mises en évidence, par l'analyse de correlation et l'analyse des variables canoniques, entre la croissance et les teneurs en azote et en potassium des aiguilles de la pousse courante. Ces deux éléments permettent, par analyse discriminante progressive, de classer correctement en moyenne 53% des stations, au sein des classes de croissance prédéterminées alors que le total des caractéristiques foliaires analysées classe correctement 59% des stations. Une bonne nutrition en azote et en potassium est observée dans les plantations sur sols présentant une teneur élevée en cations échangeables et riches en limon fin et en argile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197753
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen cycling in dense plantings of hybrid poplar and black alder (1985)
    Springer
    Plant and soil 87 (1985), S. 195-208 
    Details
    ISSN: 1573-5036
    Keywords: Alnus glutinosa ; Black alder ; Dinitrogen fixation ; Hybrid poplar ; Nitrogen ; Nitrogen cycling ; Short-rotation plantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen cycling was studied during the third growing season in pure and mixed plantings (33×33 cm spacing) of hybrid poplar and black alder in southeastern Canada. After 3 years, hybrid poplar growth and N content of living tissues in a plot and of individual hybrid poplar plants increased with the proportion of black alder in a planting. No differences were detected among N contents of individual alder plants regardless of plot treatment. Black alder allocated a larger portion of its N to roots than hybrid poplar. Symbiotic nitrogen fixation was estimated to account for 80% of the nitrogen in aboveground alder tissues in the pure treatment using natural15N dilution. N return in leaf litter was estimated to be 70kg ha−1 in the pure alder treatment and decreased to a minimum of 20 kg ha−1 in the pure hybrid poplar plots. No difference was detected among treatments for throughfall N content. Nitrogen concentration in roots and leaf litterfall of black alder was higher than hybrid poplar. Significant soil N accretion occurred in mixed plantings containing two alders to one poplar and pure black alder plantings. Nitrogen availability (NO3−N) increased with the amount of black alder in a plot. Results suggest that the early increase in nitrogen accumulation of hybrid poplar in mixed treatments can be attributed to an increase of total soil N availability resulting from the input of large amounts of N from easily mineralizable alder tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277660
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