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Oecologia

, Volume 75, Issue 2, pp 207–212 | Cite as

Crown light environments of saplings of two species of rain forest emergent trees

  • S. F. Oberbauer
  • D. B. Clark
  • M. Quesada
Original Papers

Summary

The crown light environments of saplings of two Costa Rican rain forest tree species were simultaneously compared. The species, Dipteryx panamensis (Pitt.) Record & Mell., a relatively shade-intolerant species, and Lecythis ampla Miers, a shade-tolerant species, have contrasting growth and branching patterns. Quantum sensors were placed throughout the crowns of saplings up to 2.5 m tall and quantum fluxes were recorded with microloggers for seven-day periods. The shade-intolerant species had total quantum flux densities 35% larger than those of the shade-tolerant species, but totals for both species were less than 2% of full sun. More than 90% of the quantum flux densities measured within the crowns of both species were less than 25 μmol m-2s-1. Lateral light was an important component of daily quantum flux totals; for saplings of both species, the half-hour with the maximum average irradiance for the day frequently occurred in mid-morning or midafternoon. Despite dissimilar crown and leaf display, there was no difference in the overall variability of irradiance within the crowns of the two species. However, quantum fluxes received within the crowns differed substantially in both species. Within-crown locations differed significantly from day to day because of variation in weather conditions. Daily total quantum flux densities and totals expressed as a percent of full sun were significantly correlated with height growth over the previous 12 months.

Key words

Lecythis Dipteryx PPFD Rain forest 

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References

  1. Bazzaz, FA (1984) Dynamics of wet tropical forests and their species strategies. In: Medina E, Mooney HA, Vazquez-Yanes C (eds) Physiological Ecology of Plants of the Wet Tropics. Dr. W. Junk Publishers, The Hague, pp 233–243Google Scholar
  2. Björkman O, Ludlow MM (1972) Characterization of the light climate on the floor of a Queensland rainforest. Carnegie Inst Washington Year Book 71:85–94Google Scholar
  3. Brokaw NVL (1985) Treefalls, regrowth, and community structure in tropical forests. In: Pickett STA, White PS (eds) Natural Disturbance: The Patch Dynamics Perspective. Academic Press, New York, pp 53–69Google Scholar
  4. Chazdon RL (1986) Light variation and carbon gain in rain forest understory palms. J Ecol 74:995–1012Google Scholar
  5. Chazdon RL, Fetcher N (1984) Photosynthetic light environments in a lowland tropical rain forest in Costa Rica. J Ecol 72:553–564Google Scholar
  6. Chazdon RL, Field CB (1987) Photographic estimation of photosynthetically active radiation: evaluation of a computerized technique. Oecologia (Berlin) 73:525–532Google Scholar
  7. Clark DA, Clark DA (1987a) Analisis de la regeneracíon de árboles del dosel en bosque muy húmedo tropical: aspectos teóricos y practicos. Rev Biol Trop 35 [Supp]:41–54Google Scholar
  8. Clark DB, Clark DA (1987b) Population ecology and microhabitat distribution of Dipteryx panamensis, a neotropical rain forest emergent tree. Biotropica 19:236–244Google Scholar
  9. Denslow JS (1980) Gap partitioning among tropical forest trees. Biotropica 12 [Suppl]:47–55Google Scholar
  10. Evans GC, Whitmore TC, Wong YK (1960) The distribution of light reaching the ground vegetation in a tropical rain forest. J Ecol 48:193–204Google Scholar
  11. Fetcher N, Oberbauer SF, Rojas G, Strain BR (1987) Efectos del régimen de luz sobre la fotosíntesis y el crecimiento en plántulas de árboles de un bosque lluvioso tropical de Costa Rica. Rev Biol Trop 35 [Suppl]:97–110Google Scholar
  12. Gutschick VP, Barron MH, Waechter DA, Wolf MA (1985) Portable monitor for solar radiation that accumulates irradiance histograms for 32 leaf-mounted sensors. Agric Meteorol 33:281–290Google Scholar
  13. Hartshorn GS (1978) Tree falls and tropical forest dynamics. In: Tomlinson PB, Zimmermann MH (eds) Tropical Trees as Living Systems, Cambridge University Press, New York, pp 617–638Google Scholar
  14. Hartshorn GS (1980) Neotropical forest dynamics. Biotropica 12 [Suppl]:23–30Google Scholar
  15. Hartshorn GS (1983) Plants. In: Janzen DH (ed) Costa Rican Natural History. University of Chicago Press, Chicago Illinois, pp 118–157Google Scholar
  16. Pearcy RW (1983) The light environment and growth of C3 and C4 tree species in the understory of a Hawaiian forest. Oecologia (Berlin) 58:19–25Google Scholar
  17. Whitmore TC (1975) Tropical rain forests of the Far East. Clarendon Press, OxfordGoogle Scholar
  18. Whitmore TC (1978) Gaps in the forest canopy. In: Tomlinson PB, Zimmermann MH (eds) Tropical Trees as Living Systems, Cambridge University Press, New York, pp 639–655Google Scholar
  19. Woodward FI, Yaquib M (1979) Integrator and sensors for measuring photosynthetically active radiation and temperature in the field. J Appl Ecol 16:545–552Google Scholar
  20. Yoda K (1974) Three-dimensional distribution of light intensity in a tropical rain forest of West Malaysia. Japan J Ecol 24:247–254Google Scholar

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • S. F. Oberbauer
    • 1
  • D. B. Clark
    • 2
  • M. Quesada
    • 2
  1. 1.Systems Ecology Research GroupSan Diego State UniversitySan DiegoUSA
  2. 2.Organization for Tropical Studies, La Selva Biological StationUniversidad de Costa RicaSan JoséCosta Rica

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