Sorry for this...but does anyone have access to these? I can only get access from 2008 onwards :S
Balesdent, J., Wagner, G.H., and Mariotti, A., 1988, Soil organic matter turnover in long-term field experiments as revealed by carbon-13 natural abundance: Soil Science Society of America Journal, v. 52, p. 118–124.
Nadelhoffer, K.J., and Fry, B., 1988, Controls on natural nitrogen-15 and carbon-13 abundances in forest soil organic matter: Soil Science Society of America Journal, v. 52, p. 1633–1640.
Thank you