Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.19/1959
Título: A climate change scenario and soil ammonium “fixation” during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding
Autor: Figueiredo, N.
Carranca, C.
Coutinho, J.
Trindade, H.
Pereira, J.
Marques, P.
de Varennes, A.
Data: 2013
Citação: Figueiredo N., Carranca C., Coutinho J., Trindade H., Pereira J., Marques P., de Varennes A., 2013. A climate change scenario and soil ammonium “fixation” during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding. Revista de Ciências Agrárias 36 (4), 455-465.
Resumo: The “newly fixed” NH4 + in clay minerals should be considered for an efficient management of plant nutrition. In a clayloam soil cultivated in 2012 with rice under intermittent flooding and conventional agronomic practices, the dynamics of pH, N-inorganic and non-exchangeable NH4 + was evaluated i) under field conditions, air temperature and atmospheric [CO2 ] (375 µmol mol-1 air) in Salvaterra de Magos (Portugal), and ii) under elevated temperature and temperature+[CO2 ] in controlled microclimate. For that, open-top chambers were used to simulate the conditions of an increased mean air temperature (2-3 °C), alone or combined with increased [CO2 ] (550 µmol mol-1 air). Non-exchangeable NH4 was significantly higher under open-field conditions compared with the temperature elevation, with or without elevated atmospheric [CO2 ]. Temperature elevation reduced the “fixation” rate of the cation, while the CO2 concentration rise did not affect particularly the non-exchangeable form. Further studies are required for consolidation of these findings together with microbial communities and dynamics of C and N in soil.
Peer review: yes
URI: http://hdl.handle.net/10400.19/1959
ISSN: 0871-018X
Aparece nas colecções:ESAV - DZERV - Artigos publicados em revista científica

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