Modelling of soil nitrogen forms after organic amendments under controlled conditions

被引:17
作者
Pansu, M
Sallih, Z
Bottner, P
机构
[1] ORSTOM, F-34032 Montpellier, France
[2] CNRS, Ctr Ecol Fonct & Evolut, F-34033 Montpellier, France
关键词
D O I
10.1016/S0038-0717(97)00087-4
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
This N model is derived from the C model (MOMOS) published by Sallih and Pansu (1993). Both models were fitted to experimental data obtained from an incubation experiment of C-14- and N-15-labelled plant material in two soils with contrasting characteristics over 2 y under controlled laboratory conditions. The N model uses the same structure as the C model with five organic compartments: labile plant material (V-L); Stable plant material (V-R); microbial biomass (B); labile humified material (A); and stable humified material (H). Two additional compartments are included: exchangeable NH4-N and NO3-N. The transfers of N between the organic compartments are described according to first-order kinetics. Nitrogen transferred to the NH4 compartment results from the balance between the output and input of all the organic compartments. Ammonium N output is split between nitrification and immobilisation into B (77%) and H (23%). Nitrification is controlled by a microbial growth law. The N model uses the parameters defined in the C model, with a constant multiplying factor for the N kinetic constants (fn = 1.4 and 1.9 in soil 1 and 2, respectively). The additional parameters defined for inorganic pools are comparable in both soils. The predicted C-14-to-N-15 ratios of each organic compartment agree with the experimental data, showing a rapid incorporation of N-15 into microbial biomass and a gradual build-up into stable humified compounds. The model was adjusted to N-15 experimental data from five time series (each series containing from five to eight sampling occasions), and was validated using five series of corresponding total N data. MOMOS-C and -N formulation is relatively simple, combining mechanistic first-order kinetic models and growth models. The predictions are in agreement with 16 data sets including different forms of organic C-14 (three series), total C (three series), organic and inorganic N-15 and total N. (C) 1997 Elsevier Science Ltd.
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页码:19 / 29
页数:11
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