Effect of elevated ambient CO₂ concentration on water use efficiency ofPinus sylvestriformis

Abstract

Pinus sylvestriformis is an important species as an indicator of global climate changes in Changbai Mountain, China. The water use efficiency (WUE) of this species (11-year old) was studied on response to elevated CO₂ concentration at 500±100 μL·L⁻¹ by directly injecting CO₂ into the canopy under natural condition in 1998–1999. The results showed that the elevated CO₂ concentration reduced averagely stomatal opening, stomatal conductance and stomatal density to 78%, 80% and 87% respectively, as compared to normal ambient. The elevated CO₂ reduced the transpiration and enhances the water use efficiency (WUE) of plant.

Keywords

Pinus sylvestriformis / Water Use Efficiency (WUE) / Elevated CO₂ concentration

References

[1] Bazzaz F.A. The response of nature ecosystems to the rising global CO₂ levels Annu. Rew. Ecol. Syst., 1990, 21: 167-196.

[2] Ceulemans R., Mousseau M. Tansley review No. 71 effects of elevated atmospheric CO₂ on wood plants New Phytol., 1994, 127: 425-446.

[3] Havelka U.D., Ackerson R.C., Boyle M.G., Wittenbach V.A. CO₂-enrichment effects on Soybean physiology. I. Effects of long-term CO₂ exposure Crop Science, 1984, 24: 1146-1150.

[4] Shijie Han Eco-boundary Layer Ecology for Leaves, 1996 Harbin, China: Northeast Forestry University Press 198-198.

[5] Kimball B.A. Cost comparisons among free-air CO₂ enrichment, open-tops chamber, and sunlit controlled-enrichment chamber methods of CO₂ exposure Critical Review in Plant Sciences, 1992, 11(2/3): 265-270.

[6] Lipfert F.W. et al. Performance analysis of the BNL FACE gas injection System Critical Review in Plant Sciences, 1992, 11(2/3): 143-163.

[7] Morison J.I.L. Intercellular CO₂ concentration and stomatal response to CO₂, 1987 Stanford, California: Stanford University Press

[8] Poorter H. Interspecific variation in the growth response of plants to an elevated ambient CO₂ concentration Vegetatio, 1993, 104/105: 77-97.

[9] Rogers H. H., Runion B. Plant response to atmospheric CO₂ enrichment with emphasis on roots and the rhizosphere Environmental Pollution, 1994, 83: 155-189.