Interactive effects of elevated CO2, warming, and drought on photosynthesis of Deschampsia flexuosa in a temperate heath ecosystem
| Autor: | Teis Nørgaard Mikkelsen, H. Ro-Poulsen, L. van der Linden, Claus Beier, Anders Michelsen, Kristian Rost Albert |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Stomatal conductance
Light water use efficiency Physiology Nitrogen Rain CLIMAITE Plant Science Photosynthesis Poaceae chemistry.chemical_compound Soil FACE Nitrogen cycle Ecosystem leaf δ13C Carbon Isotopes biology RuBisCO Temperature Water multifactor experiment Carbon Dioxide biology.organism_classification Photosynthetic capacity Research Papers Carbon Droughts Horticulture climate change Agronomy chemistry Deschampsia flexuosa stomatal conductance Carbon dioxide Soil water Plant Stomata biology.protein Regression Analysis Seasons grassland |
| Zdroj: | Albert, K R, Ro-Poulsen, H, Mikkelsen, T N, Michelsen, A, Linden, L V D & Beier, C 2011, ' Interactive effects of elevated CO 2, warming, and drought on photosynthesis of Deschampsia flexuosa in a temperate heath ecosystem. ', Journal of Experimental Botany, vol. 62, no. 12, pp. 4253-4266 . https://doi.org/10.1093/jxb/err133 Journal of Experimental Botany |
| DOI: | 10.1093/jxb/err133 |
| Popis: | Global change factors affect plant carbon uptake in concert. In order to investigate the response directions andpotential interactive effects, and to understand the underlying mechanisms, multifactor experiments are needed.The focus of this study was on the photosynthetic response to elevated CO2 [CO2; free air CO2 enrichment(FACE)], drought (D; water-excluding curtains), and night-time warming (T; infrared-reflective curtains) ina temperate heath. A/Ci curves were measured, allowing analysis of light-saturated net photosynthesis (Pn), lightandCO2-saturated net photosynthesis (Pmax), stomatal conductance (gs), the maximal rate of Rubiscocarboxylation (Vcmax), and the maximal rate of ribulose bisphosphate (RuBP) regeneration (Jmax) along with leafd13C, and carbon and nitrogen concentration on a monthly basis in the grass Deschampsia flexuosa. Seasonaldrought reduced Pn via gs, but severe (experimental) drought decreased Pn via a reduction in photosyntheticcapacity (Pmax, Jmax, and Vcmax). The effects were completely reversed by rewetting and stimulated Pn viaphotosynthetic capacity stimulation. Warming increased early and late season Pn via higher Pmax and Jmax.Elevated CO2 did not decrease gs, but stimulated Pn via increased Ci. The T3CO2 synergistically increased plantcarbon uptake via photosynthetic capacity up-regulation in early season and by better access to water afterrewetting. The effects of the combination of drought and elevated CO2 depended on soil water availability, withadditive effects when the soil water content was low and D3CO2 synergistic stimulation of Pn after rewetting. Thephotosynthetic responses appeared to be highly influenced by growth pattern. The grass has opportunistic waterconsumption, and a biphasic growth pattern allowing for leaf dieback at low soil water availability followed byrapid re-growth of active leaves when rewetted and possibly a large resource allocation capability mediated by therhizome. This growth characteristic allowed for the photosynthetic capacity up-regulations that mediated theT3CO2 and D3CO2 synergistic effects on photosynthesis. These are clearly advantageous characteristics whenexposed to climate changes. In conclusion, after 1 year of experimentation, the limitations by low soil wateravailability and stimulation in early and late season by warming clearly structure and interact with thephotosynthetic response to elevated CO2 in this grassland species. |
| Databáze: | OpenAIRE |
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