Elevated atmospheric CO2 and increased N deposition effects on dissolved organic carbon—clues from δ13C signature  

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Hagedorn, F., Blaser, P., & Siegwolf, R. (2002). Elevated atmospheric CO2 and increased N deposition effects on dissolved organic carbon—clues from δ13C signature
 . Soil Biology and Biochemistry, 34(3), 355-366. https://doi.org/10.1016/S0038-0717(01)00191-2