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| FURTADO NETO, A. T.; JUNIOR, M.; TAPAJÓS, R.; DILL, T.; VALENTE, F.; COSME, R.; MOURA, J. M. S.; SILVA, H. C. P.; SILVA, R. da; KELLER, M.; CRILL, P.. |
| O objetivo deste trabalho é determinar a emissão de CO2 na interface solo-atmosfera e verificar a influência da umidade do solo agindo diretamente no efluxo de CO2 em uma área de floresta primária. Os fluxos de CO2 foram medidos pela utilização de câmaras dinâmicas de concentração e analisador de gás por infravermelho (LI820). O fluxo é obtido através da regressão linear do aumento da concentração de CO2 dentro das câmaras em função do tempo das medidas. O efluxo anual de CO2 do solo foi de 2,80 ± 0,56 µmol CO2 m-2 s-1. A umidade no solo foi um fator importante responsável pelo controle da respiração do solo |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Emissão de co2; Umidade do solo; Efluxo. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/975967 |
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| KELLER, M.; VARNER, R.; DIAS, J. D.; SILVA, H.; CRILL, P.; OLIVEIRA JUNIOR, R. C. de; ASNER, G. P.. |
| Selective logging is an extensive land use in the Brazilian Amazon region. The soil?atmosphere fluxes of nitrous oxide (N2O), nitric oxide (NO), methane (CH4), and carbon dioxide (CO2) are studied on two soil types (clay Oxisol and sandy loam Ultisol) over two years (2000?01) in both undisturbed forest and forest recently logged using reduced impact forest management in the Tapajos National Forest, near Santarem, Para, Brazil. In undisturbed forest, annual soil?atmosphere fluxes of N2O (mean ± standard error) were 7.9 ± 0.7 and 7.0 ± 0.6 ng N cm?2 h?1 for the Oxisol and 1.7 ± 0.1 and 1.6 ± 0.3 ng N cm?2 h?1 for the Ultisol for 2000 and 2001, respectively. The annual fluxes of NO from undisturbed forest soil in 2001 were 9.0 ± 2.8 ng N cm?2 h?1 for the... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Trace gas; Floresta tropical. |
| Ano: 2005 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/578048 |
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| OLIVEIRA JUNIOR, R. C.; KELLER, M.; CRILL, P.; BELDINI, T.; HAREN, J. van; CAMARGO, P.. |
| The emission of gases that may potentially intensify the greenhouse effect has received special attention due to their ability to raise global temperatures and possibly modify conditions for life on earth. The objectives of this study were the quantification of trace gas flux (N2O, CO2 and CH4) in soils of the lower Amazon basin that are planted with rice and soybean, and the relation of this flux to soil physical and chemical parameters and to precipitation. This study was conducted in agricultural fields planted with rice (Oryza sativa) and soybean (Glycine max), located near the cities of Belterra and Santarém in western Pará State, Brazil, during the production years of 2005 to 2007. Measurements were done using static chambers in the field, and... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Gases; Soja; Arroz; Amazônia. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1025759 |
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| OLIVEIRA JUNIOR, R. C. de; KELLER, M.; CRILL, P.; BELDINI, T. P.; CAMARGO, P.; HAREN, J. van.. |
| The emission of gases that may potentially intensify the greenhouse effect has received special attention due to their ability to raise global temperatures and possibly modify conditions for life on earth. The objectives of this study were the quantification of trace gas flux (N2O, CO2 and CH4) in soils of the lower Amazon basin that are planted with rice and soybean, and the relation of this flux to soil physical and chemical parameters and to precipitation. This study was conducted in agricultural fields planted with rice (Oryza Sativa) and soybean (Glycine max), located near the cities of Belterra and Santarém in western Pará State, Brazil, during the production years of 2005-2007. Measurements were done using static chambers in the field, and samples... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Soja; Cultivo; Arroz; Amazônia; Gases. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1030892 |
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