Consulta: creatorFacets:"Zschornack,Tiago"
Registros recuperados: 6
Data/hora: 09/06/2024 09:04:53

Impacto de plantas de cobertura e da drenagem do solo nas emissões de CH 4 e N 2 O sob cultivo de arroz irrigado
Provedor de dados: 86
Autores: Zschornack,Tiago; Rosa,Carla Machado da; Camargo,Estefânia Silva; Reis,Cecília Estima Sacramento dos; Schoenfeld,Rodrigo; Bayer,Cimélio.
Resumo O objetivo deste trabalho foi avaliar o impacto das plantas de cobertura de inverno azevém (Lolium multiflorum) e azevém+cornichão (Lotus corniculatus), bem como da drenagem parcial do solo, nas emissões de CH4 e N2O em um Planossolo cultivado com arroz irrigado. Amostras de ar foram coletadas semanalmente com câmara estática fechada, parcialmente inserida no solo (0,05 m). Calcularam-se o potencial de aquecimento global parcial (PAGp=CH4×25+N2O×298) e o PAGp por unidade de produtividade de grãos (PAGpPG). A drenagem parcial foi estabelecida pela suspenção temporária da irrigação por períodos de 8 a 15 dias, durante três ocasiões ao longo do ciclo da cultura. O aporte de resíduos pelas plantas de cobertura intensificou os fluxos de CH4 do solo, que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Gases de efeito estufa; Irrigação intermitente; Manejo da água; Potencial de aquecimento global; Resíduos culturais.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901163

Methane efflux in rice paddy field under different irrigation managements
Provedor de dados: 90
Autores: Moterle,Diovane Freire; Silva,Leandro Souza da; Moro,Vagner João; Bayer,Cimélio; Zschornack,Tiago; Avila,Luis Antonio de; Bundt,Ângela da Cas.
Paddy rice fields may contribute to methane (CH4) emission from soil due to anaerobic conditions after flooding. Alternatives to continuous flooding irrigation in rice have been developed to mitigate CH4 efflux into the atmosphere. This study aims to investigate the effects of irrigation managements in the CH4 efflux during the rice growing season. An experiment was carried out at in Santa Maria, Rio Grande do Sul State, Brazil, during 2007/08 and 2009/10 growing seasons. The treatments were continuous flooding and intermittent irrigation in 2007/08 and continuous flooding, intermittent irrigation and flush irrigation in 2009/10. Intermittent irrigation is effective in mitigating CH4 efflux from rice fields when climatic conditions enable water absence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gas; Flooding irrigation; Intermittent irrigation; Redox potential.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200014

Soil CH4 and N2O Emissions from Rice Paddy Fields in Southern Brazil as Affected by Crop Management Levels: a Three-Year Field Study
Provedor de dados: 90
Autores: Zschornack,Tiago; Rosa,Carla Machado da; Reis,Cecília Estima Sacramento dos; Pedroso,Gabriel Munhoz; Camargo,Estefânia Silva; Santos,Daiane Carvalho dos; Boeni,Madalena; Bayer,Cimélio.
ABSTRACT Rice yield increases in response to improvements in crop management, but the impact on greenhouse gas (GHG) emissions in the subtropical region of Southern Brazil remains unknown. A three-year field study was developed aiming to evaluate the impact that an increase in crop management levels (high and very high) has on soil methane (CH4) and nitrous oxide (N2O) emissions, as compared to the level (medium) currently adopted by farmers in Southern Brazil. Differences in crop management included seed and fertilizer rates, irrigation, and pesticide use. The effect of crop management levels on the annual partial global warming potential (pGWP = CH4 × 25 + N2O × 298) ranged from 7,547 to 17,711 kg CO2eq ha−1 and this effect was larger than on the rice...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entisols; Flooded rice; Greenhouse gases; Methane; Yield-scaled.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100516

Dinâmica da emissão de metano em solos sob cultivo de arroz irrigado no sul do Brasil
Provedor de dados: 90
Autores: Silva,Leandro Souza da; Griebeler,Gustavo; Moterle,Diovane Freire; Bayer,Cimélio; Zschornack,Tiago; Pocojeski,Elisandra.
Solos de várzea sob cultivo de arroz irrigado contribuem com aproximadamente 18 % das emissões totais de metano (CH4) do Estado do Rio Grande do Sul. Entretanto, a liberação de CH4 depende do curso de redução de cada solo. O objetivo do presente estudo foi avaliar a dinâmica da emissão desse gás de efeito estufa (GEE) em seis solos: Gleissolo (2), Planossolo (2), Chernossolo e Neossolo, representativos do cultivo de arroz irrigado no Sul do Brasil, visando identificar também sua relação com propriedades do solo e as alterações eletroquímicas da solução após o alagamento. O experimento foi realizado em casa de vegetação, com três repetições, segundo delineamento de blocos casualizados. Os solos foram dispostos em vasos de PVC mantidos com uma lâmina de água...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquecimento global; Gases de efeito estufa; Redução do solo; Solos de várzea.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200016

Daycent Simulation of Methane Emissions, Grain Yield, and Soil Organic Carbon in a Subtropical Paddy Rice System
Provedor de dados: 90
Autores: Weiler,Douglas Adams; Tornquist,Carlos Gustavo; Zschornack,Tiago; Ogle,Stephen Michael; Carlos,Filipe Selau; Bayer,Cimélio.
ABSTRACT The DayCent ecosystem model, widely tested in upland agroecosystems, was recently updated to simulate waterlogged soils. We evaluated the new version in a paddy rice experiment in Southern Brazil. DayCent was used to simulate rice yield, soil organic carbon (SOC), and soil CH4 fluxes. Model calibration was conducted with a multiple-year dataset from the conventional tillage treatment, followed by a validation phase with data from the no-tillage treatment. Model performance was assessed with statistics commonly used in modeling studies: root mean square error (RMSE), model efficiency (EF), and mean difference (M). In general, DayCent slightly underestimated rice yields under no-tillage (by 0.07 Mg ha-1, or 9.2 %) and slightly overestimated soil C...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Soil potential redox; Flooded soil; Greenhouse gas; Soil tillage.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100523

Mitigation of methane and nitrous oxide emissions from flood-irrigated rice by no incorporation of winter crop residues into the soil
Provedor de dados: 90
Autores: Zschornack,Tiago; Bayer,Cimélio; Zanatta,Josiléia Acordi; Vieira,Frederico Costa Beber; Anghinoni,Ibanor.
Winter cover crops are sources of C and N in flooded rice production systems, but very little is known about the effect of crop residue management and quality on soil methane (CH4) and nitrous oxide (N2O) emissions. This study was conducted in pots in a greenhouse to evaluate the influence of crop residue management (incorporated into the soil or left on the soil surface) and the type of cover-crop residues (ryegrass and serradella) on CH4 and N2O emissions from a flooded Albaqualf soil cultivated with rice (Oryza sativa L.). The closed chamber technique was used for air sampling and the CH4 and N2O concentrations were analyzed by gas chromatography. Soil solution was sampled at two soil depths (2 and 20 cm), simultaneously to air sampling, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gases; Flooded rice; Soil management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200031