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Titre :
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Nitrogen mineralisation and its error of estimation under field conditions related to the light-fraction soil organic matter
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Auteurs :
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J. Sierra
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Type de document :
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article/chapitre/communication
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Année de publication :
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1996
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Format :
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p. 755-767
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Langues:
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= Anglais
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Catégories :
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AGRONOMIE
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Mots-clés:
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AZOTE
;
INCUBATION
;
VARIABILITE SPATIALE
;
HUMIDITE DU SOL
;
TEMPERATURE
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Résumé :
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In situ incubations of intact soil cores were carried out to identify factors controlling nitrogen (N) mineralisation and its spatial variability under field conditions. The analysed factors were soil moisture, temperature, and the content of light-fraction (density less than or equal to 2 Mg/m3 organic carbon (LC) contained in the soil. The error associated with the estimate of in situ N mineralisation was analysed using undisturbed samples in laboratory incubations. The coefficient of variation of in situ N mineralisation ranged from 58 to 234%. Nitrogen and LC mineralisation in the field showed a similar temporal pattern. The major factor affecting this pattern was soil temperature, soil moisture being near the optimum level throughout the experiment.
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Source :
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Australian Journal of Soil Research, vol.34
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