Leaf Energy Balance in the Wet Lowland Tropics

  • N. Chiariello
Part of the Tasks for vegetation Science book series (TAVS, volume 12)


The interplay between macroclimate and vegetation in the wet tropics creates leaf microclimates in which light intensity, humidity, air temperature, and wind velocity tend to be correlated. Along a vertical transect through the forest, this creates an increase in vapor pressure deficit (VPD) with increasing height. The correlated changes in environmental factors act to narrow the range of microclimates encountered along a vertical transect through the forest, making it possible to simulate leaf energy balance for “typical” microhabitats. Basing the simulations on leaves of the size most frequently encountered and with stomatal responses to light and VPD, leaf energy balance along a vertical gradient from forest floor to canopy can be summarized as follows:

As a result of high (>90%) humidities and low radiation in the understory, leaf temperatures are generally very close to air temperature. As radiation increases and humidity decreases, leaf overtemperatures rise to about 6°C, and transpiration rates increase. Simulations and several observations suggest that leaf temperatures near the top of the canopy or in clearings can exceed 40°C under moderately high radiation.

Leaf size has received considerable study in the wet tropics. Trends toward leaves larger than the predominant size (the mesophyll) occur with increasing moisture and increasing shade, but gap species often have large leaves.

Optimization models have predicted that leaf size should be maximal in either the lowest or the intermediate strata. Simulations with varying leaf size and stomatal conductance suggest that leaf size has little effect on energy balance in understories and that interactions with conductance determine the consequences of leaf size in open conditions.

General trends in leaf energy balance for a number of sites and habitat types are not yet available. Further studies are needed of stomatal conductance and responses to VPD, leaf temperature relations, and absorptance properties.


Stomatal Conductance Vapor Pressure Deficit Leaf Size Leaf Temperature Stomatal Response 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Allee WC (1926) Measurement of environmental factors in the tropical rain-forest of Panama, Ecology 7, 273–302.CrossRefGoogle Scholar
  2. Allen LH Jr, Lemon E and Muller L (1972) Environment of a Costa Rican forest, Ecology 53, 102–111.CrossRefGoogle Scholar
  3. Aoki M, Yabuki K and Koyama H (1975) Micrometeorology of primary production of a tropical rain forest in West Malaysia, J. Agric. Meteor. ( Tokyo ) 31, 115–124.CrossRefGoogle Scholar
  4. Ashton PS (1978) Crown characteristics of tropical trees. In Tomlinson PB and Zimmerman MH eds. Cambridge, Cambridge University Press.Google Scholar
  5. Baynton HW, Biggs WG, Hamilton HL Jr, Sherr PE and Worth JJB (1965) Wind structure in and above a tropical forest, J. Appi. Meteorol. 4, 670–675.CrossRefGoogle Scholar
  6. Baynton HW, Hamilton HL Jr, Sherr PE and Worth JJB (1965) Temperature structure in and above a tropical forest, Quart. J. Roy. Meteor. Soc. ( London ) 91, 225–232.CrossRefGoogle Scholar
  7. Bazzaz FA and Pickett STA (1980) Physiological ecology of tropical succession: a comparative review, Annu. Rev. Ecol. Syst. 11, 287–310.CrossRefGoogle Scholar
  8. Cachan P (1963) Signification écologique des variations microclimatiques verticales dans la foret sempervirente de basse Cote d’Ivoire, Annales Faculté Sciences Dakar 8, 89–155.Google Scholar
  9. Cachan P and Duval J (1963) Variations microclimatiques verticales et saisonnières dans la foret sempervirente de basse Cote d’Ivoire, Annales Faculté Sciences Dakar 8, 5–87.Google Scholar
  10. Cain SA, Castro GM de Oliviera, Pires JM and da Silva NT (1956) Application of some phytosociological techniques to Brazilian rain forest, Am. J. Bot. 43, 911–941.CrossRefGoogle Scholar
  11. Evans GC (1939) Ecological studies on the rain forest of southern Nigeria II. The atmospheric environmental conditions, J. Ecol. 27, 436–482.CrossRefGoogle Scholar
  12. Fetcher N (1981) Leaf size and leaf temperature in tropical vines, Am. Nat. 117, 1011–1014.CrossRefGoogle Scholar
  13. Field C, Chiariello N and Williams WE (1982) Determinants of leaf temperature in California Mimulus species at diffrent altitudes, Oecologia 55, 414–420.CrossRefGoogle Scholar
  14. Gates DM (1962) Energy exchange and the biosphere. New York, Harper and Row.Google Scholar
  15. Gates DM and Papian LE (1971) Atlas of energy budgets of plant leaves. New York, Academic Press.Google Scholar
  16. Geller GN and Smith WK (1982) Influence of leaf size, orientation, and arrangement on temperature and transpiration in three high- elevation, large-leafed herbs, Oecologia 227–234 ).Google Scholar
  17. Givnish T (1979) On the adaptive significance of leaf form. In Solbrig OT, Jain S, Johnson GB and Raven PH eds. Topics in plant population biology. New York, Columbia University Press.Google Scholar
  18. Givnish TJ and Vermeij GJ (1976) Sizes and shapes of liane leaves, Am. Nat. 110, 743–778.CrossRefGoogle Scholar
  19. Grace J, Fasehun FE and Dixon M (1980) Boundary layer conductance of the leaves of some tropical timber trees, Plant Cell Env. 3, 443–450.Google Scholar
  20. Grace J, Okali DUU and Fasehun FE (1982) Stomatal conductance of two tropical trees during the wet season in Nigeria, J. Appl. Ecol. 19, 659–670.CrossRefGoogle Scholar
  21. Grubb PJ (1977) Control of forest growth and distribution on wet tropical mountains: with special reference to mineral nutrition, Annu. Rev. Ecol. Syst. 8, 83–107.CrossRefGoogle Scholar
  22. Grubb PJ and Whitmore TC (1966) A comparison of montane and lowland rain forest in Ecuador, J. Ecol. 54, 303–333.CrossRefGoogle Scholar
  23. Grubb PJ, Lloyd JR, Pennington TD and Whitmore TC (1963) A comparison of montane and lowland rain forest in Ecuador. I. The forest structure, physiognomy, and floristics, J. Ecol. 51, 567–601.Google Scholar
  24. Hall AE, Schulze E-D and Lange OL (1976) Current perspectives of steady-state stomatal responses to environment. In Lange OL, Kappen I and Schulze E-D, eds. Water and plant life: problems and modern approaches, pp. 169–188. Heidelberg, Springer.Google Scholar
  25. Hall JB and Swaine MD (1981) Distribution and ecology of vascular plants in a tropical rain forest. The Hague, Dr W. Junk.Google Scholar
  26. Halle F, Oldeman RAA and Tomlinson PB (1978) Tropical trees and forest - an architectural analysis, New York, Springer-Verlag.Google Scholar
  27. Holdridge LR, Grenke WC, Hatheway WH, Liang T and Tosi JA Jr (1971) Forest environments in tropical life zones, New York, Pergamon Press.Google Scholar
  28. Körner C, Scheel JA and Bauer H (1979) Maximum leaf diffusive conductance in vascular plants, Photosynthetica 13, 45–82.Google Scholar
  29. Landsberg JJ and Butler DR (1880) Stomatal response to humidity: implications for transpiration, Plant Cell Env. 3, 29–33.Google Scholar
  30. Lee DW and Lowry JB (1980) Young-leaf anthocyanin and solar ultraviolet, Biotropica 12, 75 - 76.CrossRefGoogle Scholar
  31. Leigh EG Jr (1975) Structure and climate in tropical rain forest, Annu. Rev. Ecol. Syst. 6, 67–86.CrossRefGoogle Scholar
  32. List RJ (1971) Smithsonian Meteorological Tables. 6th rev. ed. Washington, DC, Smithsonian Institution Press.Google Scholar
  33. Medina E, Sobrado M and Herrera R (1978) Significance of leaf orientation for leaf temperature in an Amazonian sclerophyll vegetation, Radiat. Environ. Biophys. 15, 131–140.PubMedCrossRefGoogle Scholar
  34. Mooney HA, Field C, Vazquez Yanes C and Chu C (1983) Environmental controls on stomatal conductance in a shrub of the humid tropics, Proc. Natl. Acad. Sei. USA 80, 1295–1297.CrossRefGoogle Scholar
  35. Odum HT, Lugo A, Clintron G and Jordan C (1970) Metabolism and évapotranspiration of some rain forest plants and soil. In Odum HT ed. A tropical rain forest, pp. I-103–I-164. Oak Ridge, Tennessee, USAEC Division of Technical Information Extension.Google Scholar
  36. Parkhurst DF and Loucks OL (1972) Optimal leaf size in relation to environment, J. Ecol. 60, 505–537.CrossRefGoogle Scholar
  37. Pearcy RW (1983) The light environment and growth of C3 and C4 species in the understory of a Hawaiian forest, Oecologia 58, 19–25.CrossRefGoogle Scholar
  38. Penman HL (1948) Natural evaporation from open water, bare soil, and grass, Proc. R. Soc. London A, 194: 120–145.Google Scholar
  39. Raschke K (1956) Uber die physikalischen Beziehungen zwischen Wärmeübergangszahl, Strahlungsaustausch, Temperatur und Transpiration eines Blattes, Planta 48, 200–237.CrossRefGoogle Scholar
  40. Raunkiaer C (1934) The life-forms of plants and statistical plant geography, Oxford, Clarendon Press.Google Scholar
  41. Richards PW (1964) The tropical rain forest. Cambridge, Cambridge University Press.Google Scholar
  42. Schulz JP (1960) Ecological studies on rain forest in northern Suriname. Amsterdam, Noord. Hollandische, Uitg. Mij.Google Scholar
  43. Smith WK and Geller GN (1980) Leaf and environmental parameters influencing transpiration: theory and field measurements, Oecologia 46, 308–313.Google Scholar
  44. Taylor SE (1975) Optimal leaf form. In Gates DM and Schmerl RB, eds. Perspectives of biophysical ecology, pp. 75–86. New York, Springer-Verlag.Google Scholar
  45. Taylor SE and Sexton OJ (1972) Some implications of leaf tearing in the Musaceae, Ecology 53, 143–149.CrossRefGoogle Scholar
  46. Tracy CR, Welch WR and Porter WP (1980) Properties of Air. Tech. Rep. No. 1. Laboratory for Biophysical Ecology, Madison Wisconsin.Google Scholar
  47. Walter H (1971) Ecology of tropical and subtropical vegetation. Edinburgh, Oliver and Boyd.Google Scholar
  48. Webb U (1959) A physiognomic classification of Australian rain forests, J. Ecol. 47, 551–570.CrossRefGoogle Scholar
  49. Whitehead D, Okali DUU and Fasehun FE (1981) Stomatal response to environmental variables in two tropical forest species during the dry season in Nigeria, J. Appl. Ecol. 18, 571–587.CrossRefGoogle Scholar

Copyright information

© Dr W. Junk Publishers, The Hague 1984

Authors and Affiliations

  • N. Chiariello
    • 1
  1. 1.Department of BiologyUniversity of UtahSalt Lake CityUSA

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