Skip to Main content Skip to Navigation
Journal articles

Relationship between mineral N content and N mineralization rate in disturbed and undisturbed soil samples incubated under field and laboratory conditions

Abstract : An investigation of in situ N mineralization, using undisturbed soil samples, indicated a negative relationship between the mineral N content [(NO3+NH4)-N] at the beginning of the experiment and the mineral N produced during it. This suggests that a maximum value of mineral N accumulation in intact soil cores could be calculated from the relationship between mineral N content and N mineralization rate. This value would be related to the size of the mineralizable N pool. If this hypothesis is true, the amount of mineralizable N could be estimated from in situ incubations and utilized in the modelling of N mineralization in the field. The aim of this work was to verify this hypothesis. The relationship between the mineral N content and the N mineralization rate was analysed for in situ and laboratory incubations of disturbed and undisturbed soil samples. A negative relationship between the two variables was only obtained for the experiments carried out with undisturbed samples (in the field and laboratory incubations) when the soil moisture content was not limiting for N mineralization. Futhermore, in undisturbed samples, a negative relationship between mineralization rates of consecutive incubation periods was observed, i.e. the soil sample producing relatively more, during a given period, produced relatively less in the following period. This relationship suggests a feedback mechanism operating in N mineralization which would be related to a mineralization-immobilization process in soil microsites. Thus, the N mineralization pattern was more complex than that described by initial hypothesis. The possible consequence of this feedback mechanism on in situ N dynamics is discussed.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02713391
Contributor : Migration Prodinra <>
Submitted on : Monday, June 1, 2020 - 6:54:55 PM
Last modification on : Tuesday, September 7, 2021 - 3:33:03 PM
Long-term archiving on: : Friday, September 25, 2020 - 7:08:11 AM

File

Sierra_AJSR_1992_1.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Jorge Sierra. Relationship between mineral N content and N mineralization rate in disturbed and undisturbed soil samples incubated under field and laboratory conditions. Australian Journal of Soil Research, CSIRO Publishing, 1992, 30 (4), pp.477-492. ⟨10.1071/SR9920477⟩. ⟨hal-02713391⟩

Share

Metrics

Record views

27

Files downloads

85