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  • 1
    Digitale Medien
    Digitale Medien
    The description of spatial pattern using two-dimensional spectral analysis (1984)
    Springer
    Plant ecology 56 (1984), S. 75-85 
    Details
    ISSN: 1573-5052
    Schlagwort(e): Inhibition ; Invasion ; Pattern ; Simulation ; Spectral analysis ; Vegetation analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Two-dimensional spectral analysis is a general interrogative technique for describing spatial patterns. Not only is it able to detect all possible scales of pattern which can be present in the data but it is also sensitive to directional components. Four functions are described: the autocorrelation function; the periodogram; and, the R- and Θ-spectra which respectively summarize the periodogram in terms of scale and directional components of pattern. The use of these functions is illustrated by their application to a simple wave pattern, a wave pattern with added noise, and patterns simulating competition and invasion processes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00033049
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The interpretation of process from pattern using two-dimensional spectral analysis: modelling single species patterns in vegetation (1984)
    Springer
    Plant ecology 56 (1984), S. 113-123 
    Details
    ISSN: 1573-5052
    Schlagwort(e): Calluna vulgaris ; Competition ; Invasion ; Pattern ; Pteridium aquilinum ; Spectral analysis ; Vegetation analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Two-dimensional spectral analyses of spatial patterns are made using (i) the autocorrelation function, (ii) the periodogram, and its polar summary (iii) the R-spectrum and (iv) the Θ-spectrum. Together these give a sensitive analysis of both the complete range of scales of pattern and directional components which exist in data sets and we illustrate how the significance of observed spectral features can be assessed. We investigate the spatial pattern of Calluna vulgaris in a regenerating woodland and of Epilobium angustifolium spreading in a woodland following the thinning of trees. Evidence in the spectra is found for directional, clumping and inhibition patterns, and is discussed in relation to spectra obtained from simulations of known pattern generating processes. Hypotheses about the important biological, environmental and management influences on the structure of the communities are examined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00033053
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Spatial pattern of trees in kerangas forest, Sarawak (1986)
    Springer
    Plant ecology 65 (1986), S. 77-89 
    Details
    ISSN: 1573-5052
    Schlagwort(e): Kerangas forest ; Pattern ; Regeneration ; Sarawak ; Spectral analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The 64 most abundant species (≥10 cm dbh) in a 400×480 m plot of predominantly kerangas forest in Sarawak were individually investigated for two-dimensional pattern by spectral analysis using the basal areas of trees in 20×20 m contiguous quadrats. All species had individuals in the upper canopy. 30 species showed pattern with clumps. The most frequent scales of clump size were between 35 and 55 m across. Patterned species were less abundant in the plot, had a greater proportion of smaller (10–20 cm dbh) trees and had a lower ratio of upper to lower canopy trees than species without pattern. Trend across the plot between dipterocarp and kerangas forest types matched the change in soil from red-yellow podzol (oxisol and ultisol) to medium gleyic and bleached sand podzols (spodosol). However, soil differences and small scale (ca. 50 m) changes in topography did not account for patterns. The scale of pattern matches the size of gaps produced by windthrow. It is suggested that patterned species are light-demanding and grow from seeds in gaps, whereas non-patterned species are shade tolerant, growing within closed forest to sapling size and eventually maturing by filling smaller single tree gaps.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00044877
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