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Oecologia

, Volume 46, Issue 2, pp 147–154 | Cite as

Patterns of water potential and photosynthesis of desert sand dune plants, Eureka Valley, California

  • Bruce Michael Pavlik
Article

Summary

This study examined the mode of photosynthesis (C3 or C4), daily and seasonal patterns of xylem water potential, seasonal patterns of field photosynthesis, and the laboratory gas exchange characterisitcs of plants which grow on or in the vicinity of Eureka Dunes, Inyo County, California. The perennial duneendemic Swallenia alexandrae was found to possess the C4 pathway while all other taxa surveyed were C3. Plants which grew on the dunes exhibited: 1) significantly less negative xylem water potentials, 2) dampened seasonal changes in predawn water potentials, and 3) smaller seasonal amplitudes of water potential than plants of the adjoining flats. The minimum water potentials experienced by Swallenia during the hot summer months were a third of those endured by adjacent non-dune Larrea. Non-endemics growing on the dune had more negative xylem water potentals than dune endemics, but still never approached the low values of non-dune plants. The poor moisture retention properties of sand may have selected for moisture-conserving traits (stomatal closure at relatively high water potentials, high water use efficiency) rather than moisture-expending ones (osmoregulation, high leaf conductances) in the endemic perennials. Field measurements of photosynthesis showed that dune-restricted (but not necessarily endemic) plants had high photosynthetic capacities and sustained summer carbon assimilation, the latter being protracted months beyond the last pulse of precipitation. The C3 annual Dicoria canescens ssp. clarkae maintained photosynthetic rates well exceeding those of the C4Swallenia throughout the summer and may represent a previously undescribed physiological life form in desert plants. Laboratory measurements supplemented the field data and compared the water use efficiencies of two dune endemics. It is suggested that high photosynthetic productivity, high water use efficiency, and carbon allocation to the longitudinal growth of roots and shoots are important physiological adaptations to shifting sand and substrate moisture depletion at Eureka Dunes.

Keywords

Water Potential Sand Dune Xylem Water Desert Sand High Photosynthetic Capacity 
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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References

  1. Bagnold, R.A.: The physics of blown sand and desert dunes. New York: William Morrow and Co. 1941Google Scholar
  2. Barbour, M.G., Cunningham, G., Oechel, W.C., Bamberg, S.A.: Growth and development, form and function. In: Creosote bush; Biology and chemistry of Larrea in new world deserts (T.J. Mabry, J.H. Hunziker, D.R. DiFeo, eds.), pp. 48–91. Pennsylvania: Dowden, Hutchinson and Ross, Inc. 1977Google Scholar
  3. Beatley, J.C.: Phenological events and their environmental triggers in Mojave Desert ecosystems. Ecology 55, 856–863, (1974)Google Scholar
  4. Brown, K.W., Jordan, W.R., Thomas, J.C.: Water stress induced alterations of the stomatal response to decreases in leaf water potential. Physiol. Plant. 37, 1–5 (1976)Google Scholar
  5. DeDecker, M.: The Eureka Dunes. Fremontia 3, no. 4, 17–20 (1976)Google Scholar
  6. De Jong, T.M.: Comparative gas exchange of four California beach taxa. Oecologia (Berl.) 34, 343–351 (1978)Google Scholar
  7. Ehleringer, J.R., Björkman, O.: A comparison of photosynthetic characteristics of Encelia species possessing glabrous and pubescent leaves. Plant Physiol. 62, 185–190 (1978)Google Scholar
  8. Ehleringer, J.R., Mooney, H.A., and Berry, J.A.: Photosynthesis and microclimate of Camissonia claviformis, a desert winter annual. Ecology 60, 280–286 (1979)Google Scholar
  9. Evenari, M., Shanan, L., Tadmor, N.H.: The Negev; The challenge of a desert. Cambridge: Harvard University Press 1971Google Scholar
  10. Frank, F.J.: Availability of ground water in the Clatsop Plains sand-dune area, Clatsop County, Oregon. U.S. Geological Surgey Open File Reports, Clatsop County Oregon (1968)Google Scholar
  11. Hatch, M.D.: The C4 pathway of photosynthesis: mechanism and function. In: CO2 metabolism and plant productivity (R.H. Burris, C.C. Black, eds.), pp. 59–81. Baltimore: University Park 1976Google Scholar
  12. Hsaio, T.C., Acevedo, E.: Plant responses to water deficits, wateruse efficiency, and drought resistance. Agric. Meteor. 14, 59–84 (1974)Google Scholar
  13. Hsaio, T.C., Acevedo, E., Fereres, E., Henderson, D.W.: Stress metabolism: water stress, growth and osmotic adjustment. Phil. Trans. R. Soc. Lond. B. 273, 479–500 (1976)Google Scholar
  14. Jarvis, P.G.: The estimation of resistances to carbon dioxide transfer. In: Plant photosynthetic production: manual of methods (Z. Sesták, J. Catský, P.G. Jarvis, eds.), pp. 566–631. The Hague: Junk 1971Google Scholar
  15. Larcher, W.: Physiological plant ecology. New York: Springer 1975Google Scholar
  16. McKee, E.D., Douglass, J.R., Rittenhouse, S.: Deformation of lee-side laminae in eolian dunes. Geol. Soc. of America Bull. 82, 359–378 (1971)Google Scholar
  17. Mooney, H.A., Björkman, O., Collatz, G.J.: Photosynthetic acclimation to temperature and water stress in the desert shrub Larrea divericata. Carnegie Inst. Year Book 76, 328–335 (1977)Google Scholar
  18. Munz, P.A.: A flora of southern California. Berkeley: University of California Press 1974Google Scholar
  19. Noy-Meir, I.: Desert ecosystems: Environment and producers. Ann. Rev. Ecol. Syst. 4, 25–51 (1973)Google Scholar
  20. Pavlik, B.M.: A synthetic approach to the plant ecology of desert sand dunes, Eureka Valley, California. M.S. thesis, Botany Department, University of California at Davis (1979)Google Scholar
  21. Pearcy, R.W., Berry, J.A., Bartholomew, B.: Field photosynthetic performance and leaf temperature of Phragmites communis under summer conditions in Death Valley, California. Photosynthetica 8, 104–108 (1974)Google Scholar
  22. Prill, R.C.: Movement of moisture in the unsaturated zone in a dune area, southwestern Kansas. U.S. Geol. Surv. Prof. Paper 600D (1968)Google Scholar
  23. Scholander, P.F., Hammel, H.T., Bradstreet, E.D., Hemmingsen, E.A.: Sap pressure in vascular plants. Science 148, 339–346 (1965)Google Scholar
  24. Sharp, R.P.: Kelso Dunes, Mojave Desert, California. Geol. Soc. of America Bull. 77, 1045–1074 (1966)Google Scholar
  25. Shimshi, D.: A rapid field method of measuring photosynthesis with labelled carbon dioxide. J. Exp. Bot. 20, 381–401 (1969)Google Scholar
  26. Shreve, F.: The desert vegetation of North America. Bot. Rev. 8, 195–246 (1942)Google Scholar
  27. Smith, B.N., Epstein, S.: Two categories of 13C/12C ratios for higher plants. Plant Physiol. 47, 380–384 (1971)Google Scholar
  28. Tiezen, L.L., Johnson, D.A., Caldwell, M.M.: A portable system for the measurement of photosynthesis using carbon-14 dioxide. Photosynthetica 8, 151–160 (1974)Google Scholar
  29. Went, F.W., Westergaard, W.: Ecology of desert plants. III. Development of plants in the Death Valley National Monument, California. Ecology 30, 26–38 (1949)Google Scholar

Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Bruce Michael Pavlik
    • 1
  1. 1.Department of BotanyUniversity of CaliforniaDavisUSA

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