Titre :
|
Concurrent measurements of net mineralization, nitrification, denitrification and leaching from field incubated soil cores
|
Auteurs :
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D. Hatch ;
S. Jarvis ;
R. Parkinson
|
Type de document :
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article/chapitre/communication
|
Année de publication :
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1998
|
Format :
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p. 323-330
|
Langues:
|
= Anglais
|
Catégories :
|
AGRICULTURE, AGRONOMIE ET ELEVAGE
|
Mots-clés:
|
SOL
;
CYCLE DE L'AZOTE
;
NITRIFICATION
;
LESSIVAGE DU SOL
;
LYSIMETRIE
;
INCUBATION
|
Résumé :
|
An improved method is described for incubating intact soil cores in the field, which permits concurrent measurement of net mineralization, nitrification, denitrification and leaching. Cores were enclosed in PVC tubes with minimal disturbance to the physical state or to the natural cycles of wetting/drying, soil temperature and aeration during an incubation lasting 4-5 days. An example of the application of the method is given in which soils with contrasting drainage characteristics were compared. Over a 64-day experimental period, 58% of the mineralized nitrogen (N) in a freely drained soil was nitrified and 36% of the nitrate-N (NO3--N) was denitrified. In a poorly drained soil, 72% of the mineralized N was nitrified and 63% of the NO3--N was denitrified. In both soil types, 18% of the remaining NO3--N was leached. Rates of nitrification were significantly correlated with net mineralization (r(2) = 0.41 and 0.52) and also closely correlated with denitrification (r(2) = 0.67 and 0.68) in the freely and poorly drained soils, respectively.
|
Source :
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Biology and Fertility of Soils, vol.26
|