Availability of NH4+-N to microorganisms and the soil internal N cycle
1991
Drury, C.F. | Voroney, R.P. | Beauchamp, E.G.
The fate of added 15N-labelled (NH4)2SO4 was determined in high and low NH4+ fixing soils under mineralizing conditions after 30 days of incubation at 15 degrees C. Although soils with a high capacity for NH4+ fixation had a higher organic 15N content than low fixing soils, none of the added NH4+ was recovered in microbial biomass N. The soil internal N cycle is largely comprised of two independent processes, mineralization and immobilization. both under microbial control but physically and/or temporally separate. The connection between these two processes is through the inorganic N phase, with both forms of inorganic N (NH4+ and NO3-) participating in immobilization depending on availability to the heterotrophic microbial biomass.
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