A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding
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.
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Sociedade de Ciências Agrárias de Portugal
2013
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oai:scielo:S0871-018X20130004000102014-04-22A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent floodingFigueiredo,NunoCarranca,CorinaCoutinho,JoãoTrindade,HenriquePereira,JoséMarques,PaulaVarennes,Amarilis de Atmospheric CO2 clay loam soil controlled environment open-field temperature 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.info:eu-repo/semantics/openAccessSociedade de Ciências Agrárias de PortugalRevista de Ciências Agrárias v.36 n.4 20132013-10-01info:eu-repo/semantics/articletext/htmlhttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0871-018X2013000400010en |
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Figueiredo,Nuno Carranca,Corina Coutinho,João Trindade,Henrique Pereira,José Marques,Paula Varennes,Amarilis de |
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Figueiredo,Nuno Carranca,Corina Coutinho,João Trindade,Henrique Pereira,José Marques,Paula Varennes,Amarilis de A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
author_facet |
Figueiredo,Nuno Carranca,Corina Coutinho,João Trindade,Henrique Pereira,José Marques,Paula Varennes,Amarilis de |
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Figueiredo,Nuno |
title |
A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
title_short |
A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
title_full |
A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
title_fullStr |
A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
title_full_unstemmed |
A climate change scenario and soil ammonium fixation during the seasonal rice (Oryza sativa) growth in Portugal under intermittent flooding |
title_sort |
climate change scenario and soil ammonium fixation during the seasonal rice (oryza sativa) growth in portugal under intermittent flooding |
description |
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. |
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Sociedade de Ciências Agrárias de Portugal |
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2013 |
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http://scielo.pt/scielo.php?script=sci_arttext&pid=S0871-018X2013000400010 |
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