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Titolo:
Simulation of C and N mineralisation during crop residue decomposition: A simple dynamic model based on the C : N ratio of the residues
Autore:
Nicolardot, B; Recous, S; Mary, B;
Indirizzi:
INRA, Unite Agron, F-51686 Reims 2, France INRA Reims France 2INRA, Unite Agron, F-51686 Reims 2, France INRA, Unite Agron, F-02007 Laon, France INRA Laon France F-02007INRA, Unite Agron, F-02007 Laon, France
Titolo Testata:
PLANT AND SOIL
fascicolo: 1, volume: 228, anno: 2001,
pagine: 83 - 103
SICI:
0032-079X(200101)228:1<83:SOCANM>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL BIOMASS; NITROGEN MINERALIZATION; CHEMICAL-COMPOSITION; PLANT RESIDUES; BARLEY STRAW; SOIL; CARBON; FIELD; TURNOVER; RELEASE;
Keywords:
C mineralisation; crop residues; decomposition; modelling; N mineralisation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Nicolardot, B INRA, Unite Agron, 2 Esplanade R Garros,BP 224, F-51686 Reims 2, France INRA 2 Esplanade R Garros,BP 224 Reims France 2 s 2, France
Citazione:
B. Nicolardot et al., "Simulation of C and N mineralisation during crop residue decomposition: A simple dynamic model based on the C : N ratio of the residues", PLANT SOIL, 228(1), 2001, pp. 83-103

Abstract

C and N mineralisation kinetics obtained in laboratory incubations during decomposition of crop residues under non-limiting nitrogen conditions were simulated using a simple dynamic model. This model includes three compartments: the residues, microbial biomass and humified organic matter. Seven parameters are used to describe the C and N fluxes. The decomposed C is eithermineralised as CO2 or assimilated by the soil microflora, microbial decay producing both C humification and secondary C mineralisation. The N dynamics are governed by the C rates and the C:N ratio of the compartments which remain constant in the absence of nitrogen limitation. The model was parameterised using apparent C and N mineralisation kinetics obtained for 27 different residues (organs of oilseed rape plants) that exhibited very wide variations in chemical composition and nitrogen content. Except for the C:N ratio of the residues and the soil organic matter, the other five parameters of the model were obtained by non-linear fitting and by minimising the differences between observed and simulated values of CO2 and mineral N. Three parameters, namely the decomposition rate constant of the residues, the biomass C:N ratio and humification rate, were strongly correlated with the residues C:N ratio. Hyperbolic relationships were established between these parameters and the residues C:N ratio. In contrast, the other two parameters, i.e. the decay rate of the microbial biomass and the assimilation yield of residue-C by the microbial biomass, were not correlated to the residues C:N ratio and were, therefore, fixed in the model. The model thus parameterisedagainst the residue C:N ratio as a unique criterion, was then evaluated ona set of 48 residues. An independent validation was obtained by taking into account 21 residues which had not been used for the parameterisation. Thekinetics of apparent C and N mineralisation were reasonably well simulatedby the model. The model tended to over-estimate carbon mineralisation which could limit its use for C predictions, but the kinetics of N immobilisation or mineralisation due to decomposition of residues in soil were well predicted. The model indicated that the C:N ratio of decomposers increased with the residue C:N ratio. Higher humification was predicted for substrates with lower C:N ratios. This simple dynamic model effectively predicts N evolution during crop residue decomposition in soil.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:49:19