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Predicting Soil Nitrogen Mineralization Dynamics with a Modified Double Exponential Model

W. J. Wanga,c,*, C. J. Smithb and D. Chena

a School of Resource Management, the Univ. of Melbourne, Parkville 3052, Victoria, Australia
b CSIRO Land and Water, GPO Box 1666, Canberra 2601, ACT, Australia
c Present address: NR&M, 80 Meiers Rd, Indooroopilly, Brisbane, Qld. 4068, Australia



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  		Fig. 1. Soil net N mineralization dynamics (35°C and 55% WHC) and the goodness of fit by the double exponential model with fixed mineralization rate constants. The vertical bars represent the standard deviation of triplicate measurements. R2 = 0.958–0.998 (median 0.992) for the curves fitted.

 


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  		Fig. 2. Temperature and moisture responses of the mineralization rate constants of the active (ka) and slow (ks) organic N pools. ka and ks were estimated by the double exponential model with fixed pool sizes that were obtained with the data at 35°C and 55% WHC using standard ka (0.693) and ks (o.054). The equations for insignificant moisture responses were not shown.

 


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  		Fig. 3. The measured and predicted net N mineralization for Soils 15 and 17 during a 126-d field incubation under fluctuating temperature and moisture conditions.

 




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