A climate change scenario and soil ammonium 'fixation' during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding

• Autor(a) principal: Figueiredo, Nuno
• Data de Publicação: 2019
• Outros Autores: Carranca, Corina, Coutinho, João, Trindade, Henrique, Pereira, José, Marques, Paula, Varennes, Amarilis de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://doi.org/10.19084/rca.16332
• topic: Geral

The “newly fixed” NH4+ in clay minerals should be considered for an efficient management of plant nutrition. In a clay-loam 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.