Open-top chambers were used to estimate the possible effects of global warming on δ13C of seven plant species grown in alpine meadow ecosystem. The δ13C values of plant species were lower after long-term growth in open-top chambers. In the course of experiment, temperature significantly increased inside the chambers by 4°C. Plant species grown at a lower elevation above sea level had higher δ13C values as compared to those grown at a higher elevation. This was in accordance with the effect of open-top chamber on δ13C values in plants. Greater availability of CO2 and lower water vapor pressure at higher temperature inside the chambers, as indicated by an increase in discrimination against 13CO2, probably result in more negative δ13C values of plants because higher stomatal conductance increases availability of CO2 and causes greater discrimination against 13CO2. The plant species studied could be the indicator species for testing global warming by the change in carbon isotope ratios at the two growth temperatures.
Russian Journal of Plant Physiology – Springer Journals
Published: Nov 7, 2007
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