A model for calculating nitrogen fluxes in soil using 15N tracing
作者： B. Mary , S. Recous , D. Robin
DOI: 10.1016/S0038-0717(98)00068-6
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摘要: ˇ and organic N). This fit validated the compartmental model enabled calculation of six N fluxes: mineralisation (m), ammonium immobilisation (ia), nitrate (in), nitrification (n), volatilisation (v) or denitrification (d) remineralisation recently immobilised (r). Sensitivity analysis indicated that classical assumptions exclusive (in=0) absence (r = 0) had to be rejected. NH4 appeared dominant when were both present, but was not exclusive: a Langmuir-type relationship could established between ratio ia/(ia+in) molar soil concentrations + /(NH4 +NO3 ). Remineralisation occurred simultaneously with during wheat straw decomposition represented 7‐18% gross immobilisation. Taking into account small gaseous losses, denitrification, allowed better obtained observed simulated 15N pools. Nitrification described by first order than zero kinetics. The eventuality direct assimilation microbial biomass humification determined no significant influence on other fluxes. When FLUAZ applied single treatment (NH4 labelled), it also gave good only m, i (=ia+in), n, v d determined. rates slightly lower those found paired treatments: this diAerence mainly due hypothesis r 0 disappeared fixed at value
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