Method for Field Measurements of CO2-Exchange. The Diurnal Changes in Net Photosynthesis and Photosynthetic Capacity of Lichens under Mediterranean Climatic Conditions

  • O. L. Lange
  • J. D. Tenhunen
  • P. Harley
  • H. Walz

Abstract

The determination and interpretation of patterns in photosynthetic primary production which are characteristic of different lichen species within their respective habitats may lead to a better understanding of habitat preferences and species distributions. However, the necessary photosynthetic CO2 exchange measurements are difficult to accomplish in the field. Thus, only a few examples of diurnal courses of photosynthetic CO2 uptake by poikilohydric organisms may be found in the ecophysiological literature. Recently mathematical models have been developed which have been used to simulate the net photosynthetic performance of lichens under natural conditions. Because such models are usually based upon physiological parameters obtained from laboratory experiments, their validity can only be established by comparing simulated rates of photosynthesis with rates actually measured in the field. Thus, the development of instrumentation and methods which allow accurate determination of CO2 exchange of lichens under natural conditions is essential.

Keywords

Dioxide Hydration Convection Depression Foam 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Brown, D., and Kershaw, K.A., 1984, Photosynthetic capacity changes in Peltigera. 2. Contrasting season patterns of net photosynthesis in two populations of Peltigera rufescens, New Phytologist, 96: 447–457.CrossRefGoogle Scholar
  2. Darwin, F., and Pertz, D.F.M., 1911, On a new method of estimating the aperture of stomata, Proceedings of the Royal Society London, Ser. B., 84: 136–154.CrossRefGoogle Scholar
  3. Kappen, L., Lange, O.L., Schulze, E.-D., Evenari, M., and Buschbom,U., 1979, Ecophysiological investigations on lichens of the Negev Desert. VI. Annual course of the photosynthetic production of Ramalina maciformis(Del.) Bory, Flora, 168: 85–108.Google Scholar
  4. Kappen, L., Lange, O.L., Schulze, E.-D., Buschbom, U., and Evenari, M., 1980, Ecophysiological investigations on lichens of the Negev Desert. VII. The influence of the habitat exposure on dew inhibition and photosynthetic productivity, Flora, 169: 216– 229.Google Scholar
  5. Lange, O.L., 1980, Moisture content and CO2 exchange of lichens. I. Influence of temperature on moisture-dependent net photosynthesis and dark respiration in Ramalina maciformis, Oecologia, 45: 82–87.CrossRefGoogle Scholar
  6. Lange, O.L., 1984, “CO2/H2O-Porometer zur Messung von CO2-Gaswechsel und Transpiration an Pflanzen unter natürlichen Bedingungen,” Heinz Walz Mess- und Regeltechnik, Effeltrich.Google Scholar
  7. Lange, O.L, Beyschlag W., Meyer, A., and Tenhunen, J.D., 1984a, Determination of photosynthetic capacity of lichens in the field — a method for measurement of light response curves at saturating CO2 concentration, Flora, 175: 283–293.Google Scholar
  8. Lange, O.L., Geiger, I.L., and Schulze, E.-D., 1977, Ecophysiological investigations on lichens of the Negev Desert. V. A model to simulate net photosynthesis and respiration of Ramalina maciformis, Oecologia, 28: 247–259.Google Scholar
  9. Lange, O.L., Kilian, E., Meyer, A., and Tenhunen, J.D., 1984b, Measurement of lichen photosynthesis in the field with a portable steady-state CO2-porometer, The Lichenologist, 16: 1–9.CrossRefGoogle Scholar
  10. Lange, O.L., Koch, W., and Schulze, E.-D., 1969, CO2-Gaswechsel und Wasserhaushalt von Pflanzen in der Negev-Wüste am Ende der Trockenzeit, Berichte der Deutschen Botanischen Gesellschaft, 82: 39–61.Google Scholar
  11. Lange, O.L., Schulze, E.-D., and Koch, W., 1970, Experimentell-ükologische Untersuchungen an Flechten der Negev-Wüste. II. CO2- Gaswechsel und Wasserhaushalt von Ramalina maciformis(Del.) Bory am natürlichen Standort während der sommerlichen Trocken-periode, Flora, 159: 38–62.Google Scholar
  12. Lange, O.L., and Tenhunen, J.D., 1981, Moisture content and CO2 exchange of lichens. II. Depression of net photosynthesis in Ramalina maciformisat high water content is caused by increased thallus carbon dioxide diffusion resistance, Oecologia, 51: 426–429.CrossRefGoogle Scholar
  13. Lange, O.L., and Tenhunen, J.D., 1984, “A minicuvette system for measurement of CO2 exchange and transpiration of plants under controlled conditions in field and laboratory,” Heinz Walz Mess- und Regeltechnik, Effeltrich, F.R.G.Google Scholar
  14. Schulze, E.-D., Hall, A.E., Lange, O.L., and Walz, H., 1982, A portable steady-state porometer for measuring the carbon dioxide and water vapour exchange of leaves under natural conditions, Oecologia, 53: 141–145.CrossRefGoogle Scholar
  15. Tenhunen, J.D., Lange, O.L., and Jahner, D., 1982, The control by atmospheric factors and water stress of midday stomatal closure in Arbutus unedo growing in a natural macchia, Oecologia, 55: 165–169.CrossRefGoogle Scholar
  16. Tenhunen, J.D., Yocum, C., and Gates, D.M., 1976, Development of a photosynthesis model with an emphasis on ecological applications. I. Theory, Oecologia, 26: 89–100.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • O. L. Lange
    • 1
  • J. D. Tenhunen
    • 2
  • P. Harley
    • 3
  • H. Walz
    • 4
  1. 1.Lehrstuhl für Botanik IIUniversität WürzburgGermany
  2. 2.Systems Ecology Research GroupSan Diego State UniversitySan DiegoUSA
  3. 3.Department of BiologyUniversity of UtahSalt Lake CityUSA
  4. 4.EffeltrichGermany

Personalised recommendations