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Mean annual SPOM δ13C, δ15N, and molar C/N ratio in the headwater stream of the Qingjiang River. Vertical bars indicate standard deviations. Figure i, ii and iii denote SPOM δ13C values, δ15N values, and molar C/N ratio, respectively. Letters a, b, and c indicate significant (p < 0.05) differences for δ13C, δ15N, and C/N ratio. Sampling sites that do not have significantly different values share a common letter.
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