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  • Root length dynamics  (1)
  • binary tree  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Allocation, within and between organs, and the dynamics of root length changes in two birch species (1995)
    Springer
    Oecologia 101 (1995), S. 439-447 
    Details
    ISSN: 1432-1939
    Keywords: Allocation ; Betula ; Biomass ; Nutrients ; Root length dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial and temporal dynamics of biomass allocation within and between organs were investigated in seedlings of two birch species of contrasting successional status. Seedlings of Betula alleghaniensis Britt (yellow birch) and B. populifolia Marsh (gray birch) were grown for 6 weeks at two nutrient levels in rectangular plexiglass containers to allow non-destructive estimates of root growth, production and loss. Leaf area and production were simultaneously monitored. Yellow birch responded more to nutrient level than gray birch in terms of total biomass, shoot biomass, leaf area and root length. Yellow birch also flexibly altered within-organ allocation (specific leaf area, specific root length and specific soil amount). In contrast, gray birch altered between-organ allocation patterns (root length:leaf area and soil amount:leaf area ratios) more than yellow birch in response to nutrient level. Yellow birch showed greater overall root density changes within a very compact root system, while gray birch showed localized root density changes as concentric bands of new root production spread through the soil. Species differ critically in their responses of standing root length and root production and loss rates to nutrient supply. Early successional species such as gray birch are hypothesized to exhibit higher plasticity in varied environments than later successional species such as yellow birch. Our results suggest that different patterns of allocation, within and between plant organs, do not necessarily follow the same trajectories. To characterize thoroughly the nature of functional flexibility through ontogeny, within- and between-organ patterns of allocation must be accounted for.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329422
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A computer program for characterizing root system branching patterns (1992)
    Springer
    Plant and soil 140 (1992), S. 145-149 
    Details
    ISSN: 1573-5036
    Keywords: binary tree ; branching patterns ; image analysis ; line-intersection ; root systems ; topology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A computer program is presented which measures the length, branching patterns and distribution of link length within a root system. The program skeletonizes digitized images of root systems, loads these images into a binary tree data structure and uses this data structure to characterize the root systems. Measurements of the root length and topological parameters of root systems of Senecio vulgaris made by hand and by computer program were linearly related, with r2 values greater than 0.99 in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012816
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    Paper (German National Licenses)
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