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Fractionation of Nitrogen in Three Forest Soils¹

ABSTRACT

Soil nitrogen of forested Georgeville, Colfax, and Iredell soils from the North Carolina Piedmont was separated into six fractions. Amino acid N made up over 50% of soil N, while hydrolyzed NH₄⁺ + amino sugar-N was 22% of the total N. Proportions of exchangeable NH₄⁺ + NO₃^–, insoluble humin N, and hydrolyzed NH₄⁺ + amino sugar N differed with soil. The differences appeared to be related to base saturation and pH.

Key Words: distribution • North Carolina Piedmont

¹ Contribution from the Southeastern Forest Exp. Sta., Forest Serv., USDA, Asheville, N. C.

² The author is a Soil Scientist for the Southeastern Forest Exp. Sta., and is headquartered at the Station's Forestry Sciences Lab, Research Triangle Park, N. C.

Received for publication June 11, 1967. Accepted for publication July 20, 1967.