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Provedor de dados:  Rev. Bras. Ciênc. Solo
País:  Brazil
Título:  APPRAISAL OF THE SNAP MODEL FOR PREDICTING NITROGEN MINERALIZATION IN TROPICAL SOILS UNDER EUCALYPTUS
Autores:  Smethurst,Philip James
Gonçalves,José Leonardo de Moraes
Pulito,Ana Paula
Gomes,Simone
Paul,Keryn
Alvares,Clayton Alcarde
Arthur Júnior,José Carlos
Data:  2015-04-01
Ano:  2015
Palavras-chave:  Forest soil
Soil temperature
Process-based model
Resumo:  The Soil Nitrogen Availability Predictor (SNAP) model predicts daily and annual rates of net N mineralization (NNM) based on daily weather measurements, daily predictions of soil water and soil temperature, and on temperature and moisture modifiers obtained during aerobic incubation (basal rate). The model was based on in situ measurements of NNM in Australian soils under temperate climate. The purpose of this study was to assess this model for use in tropical soils under eucalyptus plantations in São Paulo State, Brazil. Based on field incubations for one month in three, NNM rates were measured at 11 sites (0-20 cm layer) for 21 months. The basal rate was determined in in situ incubations during moist and warm periods (January to March). Annual rates of 150-350 kg ha-1 yr-1 NNM predicted by the SNAP model were reasonably accurate (R2 = 0.84). In other periods, at lower moisture and temperature, NNM rates were overestimated. Therefore, if used carefully, the model can provide adequate predictions of annual NNM and may be useful in practical applications. For NNM predictions for shorter periods than a year or under suboptimal incubation conditions, the temperature and moisture modifiers need to be recalibrated for tropical conditions.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200523
Editor:  Sociedade Brasileira de Ciência do Solo
Relação:  10.1590/01000683rbcs20140379
Formato:  text/html
Fonte:  Revista Brasileira de Ciência do Solo v.39 n.2 2015
Direitos:  info:eu-repo/semantics/openAccess
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