Advertisement

Ecological Research

, Volume 3, Issue 3, pp 253–266 | Cite as

Fluctuation of photosynthetic photon flux density within aMiscanthus sinensis canopy

  • Yan-Hong Tang
  • Izumi Washitani
  • Takayoshi Tsuchiya
  • Hideo Iwaki
Article

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.

Key words

Light fluctuation Microsite Miscanthus sinensis Photosynthetic photon flux density Sunflecks 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anderson, M. C. (1964) Studies of the woodland light climate. II. Seasonal variation in the light climate. J. Ecol.52: 643–663.Google Scholar
  2. Baldocchi, D. D., Hutchison, B. A., Matt, D. R. &McMillen, T. R. (1986) Seasonal variation in the statistics of photosynthetically active radiation penetration in an oak-hickory forest. Agric. For. Meteorol.36: 343–361.CrossRefGoogle Scholar
  3. Björkman, O. &Ludlow, M. M. (1972) Characterization of the light climate on the floor of a Queensland rainforest. Carnegie Institution of Washington Yearbook71: 85–94.Google Scholar
  4. Chazdon, R. L. (1986) Light variation and carbon gain in rain forest understory palms. J. Ecol.74: 995–1012.Google Scholar
  5. — &Fetcher, N. (1984) Photosynthetic light environment in a lowland tropical rain forest in Costa Rica. J. Ecol.72: 553–564.Google Scholar
  6. Desjardins, R. L., Sinclair, T. R. &Lemon, E. R. (1973) Light fluctuations in corn. Agron. J.65: 904–908.Google Scholar
  7. Emerson, R. &Arnold, W. (1932) A separation of the reaction in photosynthesis by means of intermittent light. J. Gen. Physiol.15: 391–420.CrossRefGoogle Scholar
  8. Evans, G. C. (1956) An area survey method of investigating the distribution of light intensity in woodlands, with particular reference to sunflecks. J. Ecol.44: 391–428.Google Scholar
  9. — &Wong, T. K. (1960) The distribution of light reaching the ground vegetation in a tropical rainforest. J. Ecol.48: 193–204.Google Scholar
  10. Happer, J. L. (1977) Population biology of plants. Academic press, London.Google Scholar
  11. Hutchison, B. A. &Matt, D. R. (1977) The distribution of solar radiation within a deciduous forest. Ecol. Monog.47: 185–207.Google Scholar
  12. Monsi, M. &Saeki, T. (1953) Über den Lichtfactor in den Pflanzengesellschaften und sein Bedeutung für die Stoffproduktion. Jap. J. Bot.14: 22–52.Google Scholar
  13. — &Oshima, Y. (1955) A theoretical analysis of the succession process of plant community, based upon the production of matter. Jap. J. Bot.15: 60–82.Google Scholar
  14. Norman, J. M. &Tanner, C. B. (1969) Transient light measurements in plant canopies. Agron. J.61: 847–849.Google Scholar
  15. Numata, M. (1961) Ecology of grasslands in Japan. J. Coll. Art Sci. Chiba Univ.3: 327–342.Google Scholar
  16. Pearcy, R. W. (1983) The light environment and growth of C3 and C4 tree species in the understory of a Hawaiian forest. Oecologia (Berlin)58: 19–25.Google Scholar
  17. — &Calkin, H. (1983) Carbon dioxide exchange of C3 and C4 tree species in the understory of a Hawaiian forest. Oecologia (Berlin)58: 26–32.Google Scholar
  18. Sinclair, T. R. &Knoerr, K. R. (1982) Distribution of photosynthetically active radiation in the canopy of a loblolly pine plantation. J. Appl. Ecol.19: 183–191.Google Scholar
  19. Ustin, S. L., Woodward, R. A. &Barbour, M. G. (1984) Relationships between sunfleck dynamics and red fir seedling distribution. Ecology65(5): 1420–1428.Google Scholar
  20. Yoda, K. (1974) Three-dimensional distribution of light intensity in a tropical rain forest of West Malaysia. Jap. J. Ecol.24: 247–254.Google Scholar
  21. — &Dhanmanonda, P. (1983) Vertical and horizontal distribution of relative illuminance in the dry and wet forest in Sakaerat, NE Thailand. Jap. J. Ecol.33: 97–100.Google Scholar
  22. Young, D. R. &Smith, W. K. (1979) Influence of sunflecks on the temperature and water relations of two subalpine understory congeners. Oecologia (Berlin)43: 195–205.CrossRefGoogle Scholar

Copyright information

© Ecological Society of Japan 1988

Authors and Affiliations

  • Yan-Hong Tang
    • 1
  • Izumi Washitani
    • 1
  • Takayoshi Tsuchiya
    • 1
  • Hideo Iwaki
    • 1
  1. 1.Institute of Biological SciencesUniversity of TsukubaTsukuba, IbarakiJapan

Personalised recommendations