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  • Microsite  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Fluctuation of photosynthetic photon flux density within aMiscanthus sinensis canopy (1988)
    Springer
    Ecological research 3 (1988), S. 253-266 
    Details
    ISSN: 1440-1703
    Keywords: Light fluctuation ; Microsite ; Miscanthus sinensis ; Photosynthetic photon flux density ; Sunflecks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Detailed measurements of diurnal variations in photosynthetic photon flux density (PPFD) were made at seven locations within the canopy of aMiscanthus sinensis grassland to evaluate the light conditions of microsites for heliophilic tree seedlings. Multiple regression analysis revealed that the short-term light fluctuation on a clear day was highly dependent on the wind speed and solar elevation angle, whereas on a cloudy day it was mainly determined by the PPFD incident from above the canopy. The relative PPFD at 40 cm aboveground varied from 0.065 to 0.252, depending on sky conditions and the sensor's position in relation to clumped patches ofM. sinensis. On a clear day, the proportion of PPFD readings above 100 μmol·m−2·s−1 contributed by sunflecks ranged between 25.4% and 82.0%. Computer simulation showed that the contribution of sunflecks to the daily carbon gain ofQuercus serrata seedlings may range from 11% to 65%. The mean relative PPFD measured under diffuse light conditions was linearly related to the daily total PPFD and the daily carbon gain by single leaves ofQ. serrata seedlings. This suggests that the relative PPFD under diffuse light conditions provides an appropriate measure of site-specific light availability within a grass canopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348584
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial heterogeneity of photosynthetic photon flux density in the canopy ofMiscanthus sinensis (1989)
    Springer
    Ecological research 4 (1989), S. 339-349 
    Details
    ISSN: 1440-1703
    Keywords: Grass canopy ; Microsite ; Miscanthus sinensis ; Photosynthetic photon flux density ; Spatial distribution of light
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial variation in photosynthetic photon flux density (PPFD) was investigated in detail at different heights within the canopy of aMiscanthus sinensis grassland to evaluate the light environment of microsites for establishment of heliophilic tree seedlings. Highly heterogeneous patterns of light distribution were revealed within the apparently uniform grass canopies, especially under direct light. The frequency distribution patterns of relative PPFD (RPFD) were compared among different solar and sky conditions. With increasing height in the canopy, the mean RPFD value and standard deviation (SD) increased, while the skewness and kurtosis of the distribution decreased. The mean RPFD and SD were higher, especially at higher solar elevation angles, under direct light than those under diffuse light conditions. The frequency distribution of RPFD was more platykurtic under direct light and at higher solar elevation angles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348453
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
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