Drought Stress in Four Subalpine Species: Gas Exchange Response and Survivorship
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An assessment of adaptability of saplings of four evergreen species (Picea abies Karst., Pinus mugo Turra, Pinus peuce Grisb. and Pinus heldreichii H. Christ.), native for Bulgarian treeline zone, was made on the basis of leaf gas exchange and survivability in artificially induced drought stress. The established low sensitivity of gas exchange to summer drought and the highest mortality of P. abies may be regarded as an evidence for a narrow zone of tolerance. P. peuce and P. heldreichii have low survivorship under drought conditions, regardless of the variable effect of soil moisture on the gas exchange parameters. The better survivability and significant reduction of gas exchange in response to soil water deficit of P. mugo probably will give him an advantage in future adaptation to climate change and in competition with other subalpine species. We conclude that the expected trends in climate change will most likely lead to a further narrowing of the ecological and physiological comfortable zone for two investigated endemic species.
Keywordsdrought saplings survivorship photosynthesis transpiration
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- 1.Pachauri, R.K., Allen, M.R., Barros, V.R., Broome, J., et al., Climate Change 2014: Synthesis Report. Contribution of Working Groups I, II, and III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, Geneva, Switzerland: IPCC, 2014.Google Scholar
- 2.Ditmarova, L., Kurjak, D., Palmroth, S., Kmet, J., et al., Physiological responses of Norway spruce (Picea abies) seedlings to drought stress, Tree Physiol., 2010, vol. 30, pp. pp. 205–213.Google Scholar
- 6.Cornic, G. and Massacci, A., Leaf photosynthesis under drought stress, in Photosynthesis and the Environment, Baker, N.R., Ed., Dordrecht, 1996, pp. 347–366.Google Scholar
- 10.Minďáš, J., Čaboun, V., and Priwitzer, T. Timber line and expected climate changes, in Zborník Turiec a Fatra, Kadlečík, J., Ed., Vrútky, Slovakia: ŠOP SR, pp. 17–23.Google Scholar
- 12.Švajda J., Solár, J., Janiga, M., and Buliak, M., Dwarf pine (Pinus mugo) and selected abiotic habitat condi-tions in the Western Tatra Mountains, Mt. Res. Dev., 2011, vol. 31, pp. 220–228.Google Scholar
- 15.Schulze, E.D., Beck, E., and Müller-Hohenstein, K., Plant Ecology, Springer, 2005.Google Scholar
- 16.Abramoff, M.D., Image processing with ImageJ, Biophotonics Int., 2004, vol. 11, pp. 36–42.Google Scholar
- 18.Monson, R.K., Turnipseed, A.A., Sparks, J.P., Harley, P.C., et al., Carbon sequestration in a high-elevation, subalpine forest, Global Change Biol., 2002, vol. 8.Google Scholar