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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
31/01/2006 |
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Data da última atualização: |
08/04/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SCOPEL, E.; DOUZET, J. M.; SILVA, F. A. M. da; CARDOSO, A.; MOREIRA, J. A. A.; FINDELING, A.; BERNOUX, M. |
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Afiliação: |
ERIC SCOPEL; JEAN-MARIE DOUZET; FERNANDO ANTONIO MACENA DA SILVA; ALEXANDRE CARDOSO; JOSE ALOISIO ALVES MOREIRA, CNPAF; ANTOINE FINDELING; MARTIAL BERNOUX. |
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Título: |
Impacts des systèmes de culture en semis direct avec couverture végétale (SCV) sur la dynamique de l'eau, de l'azote minéral et du carbone du sol dans les cerrados brésiliens. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Cahiers Agricultures, v. 14, n. 1, p. 71-75, jan./fév. 2005. |
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Idioma: |
Francês |
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Conteúdo: |
Under the humid tropical climate of the Brazilian cerrados, new cropping systems have become necessary to ensure sustainable agricultural production. Direct-sowing mulch-based cropping systems (DMC) introduce a cover crop before or just after the commercial crop. They help farmers enhance natural resources and produce more total biomass during the year. Crop residues protect the soil and increase organic restitution to the system. In 1999, a Franco-Brazilian collaborative project began scientific studies aimed at quantifying the impact of DMC, especially on the dynamics of water, carbon and nitrogen. DMC systems significantly decrease water runoff. In this way they effectively fight against soil erosion, even if additional infiltrated water can sometimes saturate the system and escape by drainage. The cover crop can then recycle some of that drainage loss and protect and use water resources better throughout the year. DMC systems also provide more favourable conditions that ensure the more intensive and more regular mineralisation of soil organic matter during the rainy season. Some of the organic mulch mineralises at the same time, providing the commercial crop with the benefit of a higher pool of inorganic nitrogen. The additional cover crop can recycle part of the nitrogen not used by the commercial crop and some of the nitrogen mineralised before or after this commercial cycle. Under DMC high microbial activity is responsible for higher CO2 emissions to the atmosphere, but the soil carbon balance is nonetheless positive because of the large biomass production and organic input from the introduction of the cover crop. Even under the hot and humid conditions of the cerrados, soil carbon content increases under the more productive DMC systems. MenosUnder the humid tropical climate of the Brazilian cerrados, new cropping systems have become necessary to ensure sustainable agricultural production. Direct-sowing mulch-based cropping systems (DMC) introduce a cover crop before or just after the commercial crop. They help farmers enhance natural resources and produce more total biomass during the year. Crop residues protect the soil and increase organic restitution to the system. In 1999, a Franco-Brazilian collaborative project began scientific studies aimed at quantifying the impact of DMC, especially on the dynamics of water, carbon and nitrogen. DMC systems significantly decrease water runoff. In this way they effectively fight against soil erosion, even if additional infiltrated water can sometimes saturate the system and escape by drainage. The cover crop can then recycle some of that drainage loss and protect and use water resources better throughout the year. DMC systems also provide more favourable conditions that ensure the more intensive and more regular mineralisation of soil organic matter during the rainy season. Some of the organic mulch mineralises at the same time, providing the commercial crop with the benefit of a higher pool of inorganic nitrogen. The additional cover crop can recycle part of the nitrogen not used by the commercial crop and some of the nitrogen mineralised before or after this commercial cycle. Under DMC high microbial activity is responsible for higher CO2 emissions to the atmosphere, b... Mostrar Tudo |
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Thesagro: |
Agronomia; Biomassa; Cerrado; Matéria Orgânica; Planta de Cobertura; Plantio Direto; Recurso Natural; Solo. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/209113/1/CNPAF-2005-ce.pdf
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Marc: |
LEADER 02674naa a2200289 a 4500
001 1191642
005 2022-04-08
008 2005 bl uuuu u00u1 u #d
100 1 $aSCOPEL, E.
245 $aImpacts des systèmes de culture en semis direct avec couverture végétale (SCV) sur la dynamique de l'eau, de l'azote minéral et du carbone du sol dans les cerrados brésiliens.$h[electronic resource]
260 $c2005
520 $aUnder the humid tropical climate of the Brazilian cerrados, new cropping systems have become necessary to ensure sustainable agricultural production. Direct-sowing mulch-based cropping systems (DMC) introduce a cover crop before or just after the commercial crop. They help farmers enhance natural resources and produce more total biomass during the year. Crop residues protect the soil and increase organic restitution to the system. In 1999, a Franco-Brazilian collaborative project began scientific studies aimed at quantifying the impact of DMC, especially on the dynamics of water, carbon and nitrogen. DMC systems significantly decrease water runoff. In this way they effectively fight against soil erosion, even if additional infiltrated water can sometimes saturate the system and escape by drainage. The cover crop can then recycle some of that drainage loss and protect and use water resources better throughout the year. DMC systems also provide more favourable conditions that ensure the more intensive and more regular mineralisation of soil organic matter during the rainy season. Some of the organic mulch mineralises at the same time, providing the commercial crop with the benefit of a higher pool of inorganic nitrogen. The additional cover crop can recycle part of the nitrogen not used by the commercial crop and some of the nitrogen mineralised before or after this commercial cycle. Under DMC high microbial activity is responsible for higher CO2 emissions to the atmosphere, but the soil carbon balance is nonetheless positive because of the large biomass production and organic input from the introduction of the cover crop. Even under the hot and humid conditions of the cerrados, soil carbon content increases under the more productive DMC systems.
650 $aAgronomia
650 $aBiomassa
650 $aCerrado
650 $aMatéria Orgânica
650 $aPlanta de Cobertura
650 $aPlantio Direto
650 $aRecurso Natural
650 $aSolo
700 1 $aDOUZET, J. M.
700 1 $aSILVA, F. A. M. da
700 1 $aCARDOSO, A.
700 1 $aMOREIRA, J. A. A.
700 1 $aFINDELING, A.
700 1 $aBERNOUX, M.
773 $tCahiers Agricultures$gv. 14, n. 1, p. 71-75, jan./fév. 2005.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
03/08/2018 |
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Data da última atualização: |
03/08/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
CASTRO, V. L. S. S. de; CLEMENTE, Z.; JONSSON, C. M.; SILVA, M. S. G. M. e; VALLIM, J. H.; MEDEIROS, A. M. Z. de; MARTINEZ, D. S. T. |
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Afiliação: |
VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; ZAIRA CLEMENTE, CNPEM; CLAUDIO MARTIN JONSSON, CNPMA; MARIANA SILVEIRA GUERRA MOURA E SILVA, CNPMA; JOSE HENRIQUE VALLIM, CNPMA; ALINE MARIA ZIGIOTTO DE MEDEIROS, CENA-USP; DIEGO STEFANI TEODORO MARTINEZ, CNPEM. |
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Título: |
Nanoecotoxicity assessment of graphene oxide and its relationship with humic acid. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Environmental Toxicology and Chemistry, v. 37, n. 7, p. 1998-2012, 2018. |
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DOI: |
https://doi.org/10.1002/etc.4145 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The risk assessment of nanomaterials is essential for regulatory purposes and for sustainable nanotechnological development. Although the application of graphene oxide has been widely exploited, its environmental risk is not well understood because several environmental conditions can affect its behavior and toxicity. In the present study, the graphene oxide effect from aquatic ecosystems was assessed considering the interaction with humic acid on 9 organisms: Raphidocelis subcapitata (green algae), Lemna minor (aquatic plant), Lactuca sativa (lettuce), Daphnia magna (planktonic microcrustacean), Artemia salina (brine shrimp), Chironomus sancticaroli (Chironomidae), Hydra attenuata (freshwater polyp), and Caenorhabditis elegans and Panagrolaimus sp. (nematodes). The no-observed-effect concentration (NOEC) was calculated for each organism. The different criteria used to calculate NOEC values were transformed and plotted as a log-logistic function. The hypothetical 5 to 50% hazardous concentration values were, respectively, 0.023 (0.005-0.056) and 0.10 (0.031-0.31) mg L-1 for graphene oxide with and without humic acid, respectively. The safest scenario associated with the predicted no-effect concentration values for graphene oxide in the aquatic compartment were estimated as 20 to 100µgL-1 (in the absence of humic acid) and 5 to 23µgL-1 (in the presence of humic acid). Finally, the present approach contributed to the risk assessment of graphene oxide-based nanomaterials and the establishment of nano-regulations. Environ Toxicol Chem 2018;37:1998-2012. MenosAbstract: The risk assessment of nanomaterials is essential for regulatory purposes and for sustainable nanotechnological development. Although the application of graphene oxide has been widely exploited, its environmental risk is not well understood because several environmental conditions can affect its behavior and toxicity. In the present study, the graphene oxide effect from aquatic ecosystems was assessed considering the interaction with humic acid on 9 organisms: Raphidocelis subcapitata (green algae), Lemna minor (aquatic plant), Lactuca sativa (lettuce), Daphnia magna (planktonic microcrustacean), Artemia salina (brine shrimp), Chironomus sancticaroli (Chironomidae), Hydra attenuata (freshwater polyp), and Caenorhabditis elegans and Panagrolaimus sp. (nematodes). The no-observed-effect concentration (NOEC) was calculated for each organism. The different criteria used to calculate NOEC values were transformed and plotted as a log-logistic function. The hypothetical 5 to 50% hazardous concentration values were, respectively, 0.023 (0.005-0.056) and 0.10 (0.031-0.31) mg L-1 for graphene oxide with and without humic acid, respectively. The safest scenario associated with the predicted no-effect concentration values for graphene oxide in the aquatic compartment were estimated as 20 to 100µgL-1 (in the absence of humic acid) and 5 to 23µgL-1 (in the presence of humic acid). Finally, the present approach contributed to the risk assessment of graphene oxide-based nanomateri... Mostrar Tudo |
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Palavras-Chave: |
Ecotoxicity; Nanotecnologia; Óxido de grafeno; Predicted no-effect concentration. |
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Thesagro: |
Composto de Carbono; Composto Químico; Impacto Ambiental; Meio Ambiente Aquático. |
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Thesaurus NAL: |
Ecotoxicology; Graphene oxide; Humic acids; Nanomaterials; Nanotechnology; Risk assessment. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02720naa a2200373 a 4500
001 2093879
005 2018-08-03
008 2018 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1002/etc.4145$2DOI
100 1 $aCASTRO, V. L. S. S. de
245 $aNanoecotoxicity assessment of graphene oxide and its relationship with humic acid.$h[electronic resource]
260 $c2018
520 $aAbstract: The risk assessment of nanomaterials is essential for regulatory purposes and for sustainable nanotechnological development. Although the application of graphene oxide has been widely exploited, its environmental risk is not well understood because several environmental conditions can affect its behavior and toxicity. In the present study, the graphene oxide effect from aquatic ecosystems was assessed considering the interaction with humic acid on 9 organisms: Raphidocelis subcapitata (green algae), Lemna minor (aquatic plant), Lactuca sativa (lettuce), Daphnia magna (planktonic microcrustacean), Artemia salina (brine shrimp), Chironomus sancticaroli (Chironomidae), Hydra attenuata (freshwater polyp), and Caenorhabditis elegans and Panagrolaimus sp. (nematodes). The no-observed-effect concentration (NOEC) was calculated for each organism. The different criteria used to calculate NOEC values were transformed and plotted as a log-logistic function. The hypothetical 5 to 50% hazardous concentration values were, respectively, 0.023 (0.005-0.056) and 0.10 (0.031-0.31) mg L-1 for graphene oxide with and without humic acid, respectively. The safest scenario associated with the predicted no-effect concentration values for graphene oxide in the aquatic compartment were estimated as 20 to 100µgL-1 (in the absence of humic acid) and 5 to 23µgL-1 (in the presence of humic acid). Finally, the present approach contributed to the risk assessment of graphene oxide-based nanomaterials and the establishment of nano-regulations. Environ Toxicol Chem 2018;37:1998-2012.
650 $aEcotoxicology
650 $aGraphene oxide
650 $aHumic acids
650 $aNanomaterials
650 $aNanotechnology
650 $aRisk assessment
650 $aComposto de Carbono
650 $aComposto Químico
650 $aImpacto Ambiental
650 $aMeio Ambiente Aquático
653 $aEcotoxicity
653 $aNanotecnologia
653 $aÓxido de grafeno
653 $aPredicted no-effect concentration
700 1 $aCLEMENTE, Z.
700 1 $aJONSSON, C. M.
700 1 $aSILVA, M. S. G. M. e
700 1 $aVALLIM, J. H.
700 1 $aMEDEIROS, A. M. Z. de
700 1 $aMARTINEZ, D. S. T.
773 $tEnvironmental Toxicology and Chemistry$gv. 37, n. 7, p. 1998-2012, 2018.
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Embrapa Meio Ambiente (CNPMA) |
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