Summary
Different response patterns in net photosynthesis (A) leaf conductance (g) and water use efficiency (WUE= a/transpiration) in three subalpine plants occurred during experimental sun/shade transitions that simulated natural cloudcover. In Frasera speciosa Dougl., a large-leaved herb characteristic of open sites, g was relatively insensitive to transitions in irradiance and variations in A. However, large decreases in leaf temperature resulted in reduced transpiration during shade intervals and relatively constant WUE throughout the experimental sun/shade regime. In the understory herb, Arnica cordifolia Hook., patterns of A and g were similar during sun/shade transitions, but WUE was substantially reduced compared to steady-state levels. A third, somewhat intermediate pattern of A, g, and WUE was found in Artemisia tridentata L., an open site shrub. Higher intercellular CO2 values in A. tridentata suggested that internal, cellular limitations to A were high relative to stomatal limitations in this shrub when compared to the herbaceous species.
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References
Anderson JE (1982) Factors controlling transpiration and photosynthesis in Tamarix chinensis Lour. Ecology 63:48–56
Caldwell MM (1968) Solar ultraviolet radiation as an ecological factor for alpine plants. Ecol Monogr 38:243–268
Chazdon RL, Pearcy RW (1986) Photosynthetic responses to light variations in rainforest species. I. Induction under constant and fluctuating light conditions. Oecologia (Berlin) 69:517–523
Davies WJ, Kozlowski TT (1975) Stomatal responses to changes in light intensity as influenced by plant water stress. For Sci 21:129–133
Ehleringer JR, Miller PC (1975) A simulation of plant water relations and production in the alpine tundra, Colorado. Oecologia (Berlin) 19:177–183
Foster JR, Smith WK (1986) Influence of stomatal distribution on transpiration in low-wind environments. Pl Cell Environ 9:751–759
Grantz DA, Zeiger E (1986) Stomatal responses to light and leaf-air water vapor pressure difference show similar kinetics in sugarcane and soybean. Plant Physiol 81:865–868
Gross LJ (1982) Photosynthetic dynamics in varying light environments: a model and its applications to whole leaf carbon gain. Ecology 63:84–93
Gross LJ, Chabot BF (1979) Time course of photosynthetic response to changes in incident light energy. Plant Physiol 63:1033–1038
Hitchcock CL, Cronquist A (1976) Flora of the Pacific Northwest. Univ of Washington Press, Seattle p 703
Lasko AN, Barnes JE (1978) Apple leaf photosynthesis in alternating light. Hortscience 13:473–474
McCree KJ, Loomis RS (1969) Photosynthesis in fluctuating light. Ecology 50:422–428
Mooney HA, Field C, Vazquez-Yanes C,-Chu C (1983) Environmental controls on stomatal conductance in a shrub of the humid tropics. Proc Nat Acad Sci 80:1295–1297
Nobel PS (1983) Biophysical plant physiology and ecology. W.H. Freeman and Co., San Francisco, CA p 608
Pearcy RW (1983) The light environment and growth of C3 and C4 tree species in the understory of a Hawaiian forest. Oecologia (Berlin) 58:19–25
Pollard DFW (1970) The effect of rapidly changing light on the rate of photosynthesis in largetooth aspen (Populus grandentata). Can J Bot 48:823–829
Salisbury FB, Spomer GG, Sobral M, Ward RT (1968) Analysis of an alpine environment. Bot Gaz 129:16–32
Smith WK (1981) Temperature and water relations patterns in subalpine, understory plants. Oecologia (Berlin) 48:353–359
Smith WK, Geller GN (1980) Leaf and environmental parameters influencing transpiration: theory and field measurements. Oecologia (Berlin) 46:308–314
Willis AJ, Balasubramaniam S (1968) Stomatal behaviour in relation to rates of photosynthesis and transpiration in Pelargonium. New Phytol 67:265–285
Wong SC, Cowan IR, Farquhar GD (1985) Leaf conductance in relation to CO2 assimilation. I. Influence of nitrogen nutrition, phosphorous nutrition, photon flux density, and ambient partial pressure of CO2 during ontogeny. Plant Physiol 78:821–825
Woods DB, Turner NC (1971) Stomatal response to changing light by four tree species of varying shade tolerance. New Phytol 70:77–84
Young DR, Smith WK (1979) Influence of sunflecks on the temperature and water relations of two understory congeners. Oecologia (Berlin) 43:192–205
Young DR, Smith WK (1983) Effect of cloudcover on photosynthesis and transpiration in the subalpine understory species Arnica cordifolia. Ecology 64:681–687
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Knapp, A.K., Smith, W.K. Stomatal and photosynthetic responses during sun/shade transitions in subalpine plants: influence on water use efficiency. Oecologia 74, 62–67 (1987). https://doi.org/10.1007/BF00377346
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DOI: https://doi.org/10.1007/BF00377346