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  • 1
    Electronic Resource
    Electronic Resource
    Differences in carbon and nutrient fractions among arctic growth forms (1988)
    Springer
    Oecologia 77 (1988), S. 506-514 
    Details
    ISSN: 1432-1939
    Keywords: Carbohydrate ; Growth form ; Nitrogen ; Phosphorus ; Tundra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In a survey of 28 plant species of 6 major growth forms from Alaskan tundra, we found no consistent difference among growth forms in the chemical nature of stored reserves except for lichens and mosses (which stored C primarily as polysaccharides) and shrubs (which tended to store C more as sugars than as polysaccharides). Forbs and graminoids showed particularly great diversity in the chemical nature of stored reserves. In contrast, C, N, and P chemistry of leaves was strikingly similar among all species and growth forms. Concentrations of stored reserves of C, N, and P were highest and showed greatest seasonal fluctuations in forbs and graminoids but were relatively constant in evergreen shrubs. From this information, we draw three general conclusions: (1) the photosynthetic function of leaves strongly constrains leaf chemistry so that similar chemical composition is found in all species and growth forms: (2) the chemical nature of storage reserves is highly variable, both within and among growth forms; (3) the concentration and seasonal pattern of storage reserves are closely linked to growth-form and reflect growth-form differences in woodiness, phenology, and relative dependence upon concurrent uptake vs. storage in support of growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377266
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  • 2
    Electronic Resource
    Electronic Resource
    Environmental and physiological factors governing nutrient resorption efficiency in barley (1992)
    Springer
    Oecologia 90 (1992), S. 120-126 
    Details
    ISSN: 1432-1939
    Keywords: Nitrogen ; Nutrient stress ; Nutrient resorption ; Translocation ; Water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Barley plants (Hordeum vulgare cv. stepto) were grown in a greenhouse under two nutrient and water levels and four treatments intended to alter sourcesink relationships, in a factorial experiment designed to study factors governing efficiency of nutrient resorption from senescing leaves. Plant growth was enhanced in high-nutrient treatments, leading to higher concentrations of nitrogen (N) and phosphorus (P) in leaves and ears. Water stress reduced growth, but plants in waterstressed treatments had equal or higher nutrient concentrations than watered plants. Nutrient resorption efficiency was higher at low than at high nutrient availability, and was higher in watered than in water-stressed plants. Treatments in which sink strength was increased had enhanced resorption efficiency, as well as those in which the source activity was reduced. Our data show that the amount of nutrient resorbed and the efficiency of the resorption process depend on plant nutrient and water status, and that the presence of an active sink strongly enhances nutrient resorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317817
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  • 3
    Electronic Resource
    Electronic Resource
    Adaptation of selected trees and grasses to low availability of phosphorus (1983)
    Springer
    Plant and soil 72 (1983), S. 283-287 
    Details
    ISSN: 1573-5036
    Keywords: Barley ; Chinochloa ; Growth rate ; Nutrient deficiency ; Nutrient stress ; Phosphorus fractions ; Root-shoot ratio ; Taiga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract High-nutrient-adapted and low-nutrient-adapted species of New Zealand tussock grasses (Chionochloa), barley (Hordeum), and several taiga trees were grown at three rates of phosphorus supply. Low-nutrient-adapted species in each group of species had similar (grasses) or lower (trees) capacities for phosphate absorption, were less efficient in producing biomass (i.e. had higher nutrient concentrations), and grew more slowly than high-nutrient-adapted species. I conclude that the major adaptation to low nutrient availability in each of these comparisons is a slow growth rate that reduces the annual nutrient requirement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181967
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