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  • Mineral allocation  (2)
  • 3320K  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Accurate determination of wavenumbers for iodine molecular lines in the red spectral region (1989)
    Springer
    Applied physics 48 (1989), S. 463-466 
    Details
    ISSN: 1432-0649
    Keywords: 3320K ; 4272
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of various absorption lines of molecular iodine with wavenumbers between 12980 and 13890 cm−1 has been resolved using Doppler-free polarization spectroscopy. The wavenumbers of theo-component of 17 rovibrational lines of I2 due to the transitionB 3Π ou + −X1∑ g + with even rotational quantum numbers have been determined with an accuracy of 0.001 cm−1. A comparison of the centers of gravity of these 17 lines with the values of the iodine atlas of Gerstenkorn et al. yields a difference of $$\delta \tilde v = \tilde v_{c.g} - \tilde v_{atl} = - (1.8 \pm 1.2)x 10 - 3 cm^{ - 3}$$ thus corroborating the data of the iodine atlas in the red region within limits of error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694680
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some considerations of and perspectives in coastal ecology (1985)
    Springer
    Plant ecology 62 (1985), S. 533-545 
    Details
    ISSN: 1573-5052
    Keywords: Ammophila arenaria ; Ecological optimum ; Mineral allocation ; Optimal control ; Phleum arenarium ; Salicornia europaea ; Skewness ; Variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ecophysiological studies of plant species in wet saline habitats have been one-sided in the past, emphasizing sodium chloride only. More emphasis should be given to anaerobiosis, to mechanical factors, to the effects of a surplus of other nutrients in seawater and coastal ecosystems and their metabolic impact as well as to aspects of nutrient (re)allocation. Research should incorporate theoretical models on plant strategies maximizing yield, minimizing risk. At the population level, a new operational parameter for ecological optima and ecological stress is presented considering normal and skewed distributions of plant parameters in relation to growth and the concentration of mineral nutrients. Some considerations on the ecological effects of phenotypic plasticity and genetic variability are given by emphasizing the aspects of diaspores. Future investigations of coastal vegetation should consider the interaction of populations within plant communities, including the regulating effects of animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044779
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Size hierarchy and mineral status of Rhinanthus angustifolius populations under different grassland management regimes (1987)
    Springer
    Plant ecology 70 (1987), S. 93-103 
    Details
    ISSN: 1573-5052
    Keywords: Gini coefficient ; Grassland management ; Mineral allocation ; Rhinanthus angustifolius ; Size hierarchy ; Skewness ; Variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The size hierarchy and mineral concentrations of adult plants in flower and their seed crop have been investigated in three populations of Rhinanthus angustifolius under a grassland management regime consisting of haying without fertilization. The effect of this type of management on the nutrient budgets of soil or Rhinanthus plants was shown to be small initially, i.e. up to the twelfth year of changed management. Although the mean biomass of plants significantly diminished by 30% in this period, their nutrient concentration was not strongly affected. Small plants consistently had lower concentrations of N and Na than large plants. Prolongation of this management regime beyond twelve years let to a general reduction in the phosphorus concentration of the plants. An observed increase in the concentrations of K, Mn, and Cu, especially in small plants, is tentatively ascribed to an imbalance in mineral nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041475
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    Paper (German National Licenses)
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