《Table 1 Statics of standard materials duringα-cellulose calibration》

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《Application and verification of simultaneous determination of cellulose δ~(13)C and δ~(18)O in Picea shrenkiana tree rings from northwestern China using the high-temperature pyrolysis method》

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Note:All of the stable isotopes are from the IAEA（International Atomic Energy Agency）products except for the values with a superscript letter.All of the work to calibrate the reference materials was conducted by at least two laboratories.a，the value was

We calibrated the stable isotope measurements using two methods:the multi-standard calibration and the two-point calibration（Evans et al.，2016）.The runtime drift correction，amplitude correction，and bias correction in mean and deviation were conducted in the two-point calibration（Evans et al.，2016）.In the multi-standard calibration，we compared the stable isotope values with the mean values from four standards with known values.Here，we used the Sigma-Aldrichα-cellulose standard and three IAEA（International Atomic Energy Agency）standards（IAEA-CH3 standard，benzoic acid IAEA 601，and IAEA-C3 standard）for the calibration（Table1）.In the two-point calibration，we used two standard cellulose materials（Sigma-Aldrichα-cellulose and IAEA-CH3；Table 1），and performed the correction based on the mean difference between the measured values and the mean of these two known standard values.