One-year-old oak (Quercus mongolica Fisch.) seedlings were grown in growth chambers for 30 days to investigate the effects of the combination of elevated CO2 concentration ([CO2], 700 μmol/mol) and temperature (ambient T + 4°C) and only elevated temperature (ambient T +4°C) on leaf gas exchange, chlorophyll a fluorescence, and chlorophyll content. In the growth chambers, natural conditions of the Maoershan mountain regions of Heilongjiang Province (45–46°N, 127–128°E) of China for the average growth season were simulated. The results showed that the maximum net photosynthetic rate (P Nmax) was ≈ 1.64 times greater at elevated temperature than at ambient temperature. The irradiance saturation point (I s), apparent quantum yield (AQY), maximum photosystem II efficiency (F v/F m), and chlorophyll content significantly increased, while irradiance compensation point (I c) was not affected by elevated temperature. The combination of elevated [CO2] and temperature also significantly increased P Nmax by approximately 34% but much lower than that under elevated temperature only. In the case of factor combination, dark respiration (R d), I c, F v/F m, and total chlorophyll content increased significantly, while I s and AQY were not affected. Moreover, under elevated [CO2] and temperature, R d and I c, F v/F m were significantly higher than under elevated temperature only. The results indicated that the combination of elevated [CO2] and temperature expected in connection with the further global climate change may affect carbon storage of the coenotype of Q. mongolica in this region of China.
Russian Journal of Plant Physiology – Springer Journals
Published: Jan 18, 2011
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