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Titre :
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Temperature and soil moisture dependence of N mineralization in intact soil cores
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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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1997
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Format :
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p. 1557-1563
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Langues:
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= Anglais
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Catégories :
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AGRICULTURE, AGRONOMIE ET ELEVAGE
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Mots-clés:
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HUMIDITE DU SOL
;
TEMPERATURE DU SOL
;
SOL
;
AZOTE
;
NITRIFICATION
;
ANAEROBIOSE
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Résumé :
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The combined effect of temperature (IO, 20 and 25 °C) and soil moisture (30, 200 and 1700 kPa) on net N mineralization was examined using undisturbed soil samples in laboratory incubations. Simulations with a mechanistic model of soil anaerobiosis were made to assess the effect of temperature and soil moisture on soil aeration, which also affects N mineralization. The rate of net N mineralization showed a high variability, and 57% of this variation was associated with factors other than temperature and moisture. N mineralization was more responsive to temperature than it was to moisture. Two models based on the Arrhenius and the Q(10) functions described well the experimental data and indicated a temperature-moisture interaction affecting N mineralization. When the measured rates were corrected to take into account only the calculated aerobic fraction of the soil, a good fit with both models was still obtained. This implies that the Arrhenius and the Q(10) functions do not discriminate between the direct effect of temperature on N mineralization and the indirect effect associated to soil aeration. The use of these functions to describe N mineralization in undisturbed samples requires information on the aeration status of the soil.
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Source :
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Soil biology and biochemistry, vol.29, n°9-10
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