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    • Natural carbon-13 distribution in forested and cultivated gleysols 

      Gregorich, E.G.; Monreal, C.M.; Ellert, B.H. (1992-02-20)
      Natural 13C abundance was measured in two Gleysols, one from a forest and one which had been under continuous corn for more than 25 yr. Delta 13C values increased slightly with depth in the forest soil. In the corn soil, ...