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Estimation of Gross Nitrogen Transformations and Nitrogen Retention in Grassland Soils Using FLUAZ

^a European Commission, Joint Research Centre DG, Inst. for Reference Materials and Measurements, B-2440 Geel, Belgium
^b Lab. of Applied Physical Chemistry-ISOFYS, Faculty of Biosciences Engineering, Ghent Univ., Coupure Links 653, B-9000 Gent, Belgium
^c Chilean Nuclear Energy Commission, Amunátegui 95, P.O. Box 188-D, Santiago, Chile
^d Dep. of Soil Management and Soil Care, Faculty of Bioscience Engineering, Ghent Univ., Coupure Links 653, B-9000 Gent, Belgium

View larger version (16K): [in a new window]   Fig. 1. Compartment model of the N pools and fluxes considered in FLUAZ; m = mineralization (= ammonification), n = nitrification, v = volatilization, d = denitrification, ia = immobilization of NH4+, in = immobilization of NO3–, r = remineralization, h = humification.

View larger version (23K): [in a new window]   Fig. 2. Dynamics of the NH4+ and NO3– concentrations (a and b), and the atom% 15N excess of the NH4+ and NO3– pool (c and d) between 15 min (Day 0) and 30 d after addition of 15NH414NO3 and 14NH415NO3 in the loamy sand soil (average values of three replicates, error bars represent plus/minus one standard deviation).

View larger version (22K): [in a new window]   Fig. 3. Dynamics of the NH4+ and NO3– concentrations (a and b), and the atom% 15N excess of the NH4+ and NO3– pool (c and d) between 15 min (Day 0) and 30 d after addition of 15NH414NO3 and 14NH415NO3 in the loam soil (average values of three replicates, error bars represent plus/minus one standard deviation).

View larger version (22K): [in a new window]   Fig. 4. Dynamics of the NH4+ and NO3– concentrations (a and b), and the atom% 15N excess of the NH4+ and NO3– pool (c and d) between 15 min (Day 0) and 30 d after addition of 15NH414NO3 and 14NH415NO3 in the clay loam soil (average values of three replicates, error bars represent plus/minus one standard deviation).