《Table 1 Stomatal anatomy data of Brachyphyllum and the estimated p CO2 values from Yumen, Gansu Pro

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《"Middle Cretaceous pCO_2 Variation in Yumen, Gansu Province and its Response to the Climate Events"》

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The p CO2 of Yumen，Gansu Province is reconstructed again based on the fossil Brachyphyllum collected from four consecutive sedimentaries from the late Aptian to early Albian using the plant photosynthetic gas exchange mechanistic model approach of Franks et al.（2014）；the estimated values were 550–808 ppmv.The related stomatal anatomic and carbon isotope data are summarized in Table 1.The estimated p CO2 values based on the mechanistic model of Franks et al.（2014）is within the previous p CO2 values recovered based on SR method（Du et al.，2016）and is higher than the p CO2 reconstructed by the recent standardization（531–641 ppmv）.Moreover，it is lower than the p CO2 reconstructed by the Carboniferous standardization（882–1060 ppmv）.Overall，the p CO2 is 665 ppmv for the deposition period of the second member，788 ppmv for the deposition period of the fourth member，550 ppmv for the deposition period of the fifth member，and 808 ppmv for the deposition time of the sixth member（Fig.2 and Table 1）.Moreover，the reconstructed p CO2 showed a significant fluctuation during the four corresponding deposition periods.The p CO2 first increased during the deposition period of members 2–4，during that time the p CO2 varied from 665to 788 ppmv；then，the p CO2 decreased significantly from788 to 550 ppmv during the deposition period of members4–5.Finally，the p CO2 increased to the peak from 550 to808 ppmv during the deposition period of members 5–6（Fig.3）.