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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
17/02/2003 |
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Data da última atualização: |
17/02/2003 |
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Autoria: |
ALMEIDA, S. P. de. |
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Título: |
Caracterizacao arquitetural do estrato graminoso das savanas. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
In: ENCONTRO DE BOTANICOS DO CENTRO OESTE, 2., 1993, Corumba. Resumos. Brasilia: SBB: SBB/RCO: CNPq: EMBRAPA-CPAC, 1993. p. 19. |
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Idioma: |
Português |
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Palavras-Chave: |
Andropogon semiberbis; Elyonurus adustus; Leptocoriphyum lanatum; Sporobulus cubensis. |
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Thesagro: |
Cerrado; Floração; Gramínea. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00623naa a2200193 a 4500
001 1566246
005 2003-02-17
008 1993 bl uuuu u00u1 u #d
100 1 $aALMEIDA, S. P. de
245 $aCaracterizacao arquitetural do estrato graminoso das savanas.
260 $c1993
650 $aCerrado
650 $aFloração
650 $aGramínea
653 $aAndropogon semiberbis
653 $aElyonurus adustus
653 $aLeptocoriphyum lanatum
653 $aSporobulus cubensis
773 $tIn: ENCONTRO DE BOTANICOS DO CENTRO OESTE, 2., 1993, Corumba. Resumos. Brasilia: SBB: SBB/RCO: CNPq: EMBRAPA-CPAC, 1993. p. 19.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Acre; Embrapa Agropecuária Oeste. |
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Data corrente: |
26/11/2009 |
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Data da última atualização: |
12/12/2011 |
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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: |
GOMES, J.; BAYER, C.; COSTA, F. de S.; PICCOLO, M. de C.; ZANATTA, J. A.; VIEIRA, F. C. B.; SIX, J. |
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Afiliação: |
JULIANA GOMES, UFRGS; CIMÉLIO BAYER, UFRGS; FALBERNI DE SOUZA COSTA, CPAF-AC; MARISA DE CÁSSIA PÍCCOLO, CENA/USP; JOSILÉIA ACORDI ZANATTA, CPAO; FREDERICO COSA BEBER VIEIRA, UFP; JOHAN SIX, UNIVERSITY OF CALIFORNIA. |
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Título: |
Soil nitrous oxide emissions in long-term cover crops-based rotations under subtropical climate. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Soil & Tillage Research, v. 106, n. 1, p. 36-44, Dec. 2009. |
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DOI: |
10.1016/j.still.2009.10.001 |
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Idioma: |
Inglês
Português |
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Conteúdo: |
It has been shown that cover crops can enhance soil nitrous oxide (N2O) emissions, but the magnitude of increase depends on the quantity and quality of the crop residues. Therefore, this study aimed to evaluate the effect of long-term (19 and 21 years) no-till maize crop rotations including grass [black oat (Avena strigosa Schreb)] and legume cover crops [vetch (Vigna sativa L.), cowpea (Vigna unguiculata L. Walp), pigeon pea (Cajanus cajan L. Millsp.) and lablab (Dolichos lablab)] on annual soil N2O emissions in a subtropical Acrisol in Southern Brazil. Greater soil N2O emissions were observed in the first 45 days after the cover crop residue management in all crop rotations, varying from -20.2 ± 1.9 to 163.9 ± 24.3 ug N m-2 h-1. Legume-based crop rotations had the largest cumulative emissions in this period, which were directly related to the quantity of N (r2 = 0.60, p = 0.13) and inversely related to the lignin:N ratio (r2 = 0.89, p = 0.01) of the cover crop residues. After this period, the mean fluxes were smaller and were closely related to the total soil N stocks (r2 = 0.96, p = 0.002). The annual soil N2O emission represented 0.39-0.75% of the total N added by the legume cover crops. Management-controlled soil variables such as mineral N (NO3- and NH4+) and dissolved organic C influenced more the N2O fluxes than environmental-related variables as water-filled pore space and air and soil temperature. Consequently, the synchronization between N mineralization and N uptake by plants seems to be the main challenge to reduce N2O emissions while maintaining the environmental and agronomic services provided by legume cover crops in agricultural systems. MenosIt has been shown that cover crops can enhance soil nitrous oxide (N2O) emissions, but the magnitude of increase depends on the quantity and quality of the crop residues. Therefore, this study aimed to evaluate the effect of long-term (19 and 21 years) no-till maize crop rotations including grass [black oat (Avena strigosa Schreb)] and legume cover crops [vetch (Vigna sativa L.), cowpea (Vigna unguiculata L. Walp), pigeon pea (Cajanus cajan L. Millsp.) and lablab (Dolichos lablab)] on annual soil N2O emissions in a subtropical Acrisol in Southern Brazil. Greater soil N2O emissions were observed in the first 45 days after the cover crop residue management in all crop rotations, varying from -20.2 ± 1.9 to 163.9 ± 24.3 ug N m-2 h-1. Legume-based crop rotations had the largest cumulative emissions in this period, which were directly related to the quantity of N (r2 = 0.60, p = 0.13) and inversely related to the lignin:N ratio (r2 = 0.89, p = 0.01) of the cover crop residues. After this period, the mean fluxes were smaller and were closely related to the total soil N stocks (r2 = 0.96, p = 0.002). The annual soil N2O emission represented 0.39-0.75% of the total N added by the legume cover crops. Management-controlled soil variables such as mineral N (NO3- and NH4+) and dissolved organic C influenced more the N2O fluxes than environmental-related variables as water-filled pore space and air and soil temperature. Consequently, the synchronization between N mineralization and N upt... Mostrar Tudo |
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Palavras-Chave: |
Aveia preta; Caupi; Cero labranza; Clima subtropical; Cultivo de cobertura; Cultivos de cobertura; Emisiones de gases de efecto invernadero; Labe-labe; Legumbres; Manejo del suelo; Óxido nitroso; Pastos forrajeros; Rotación de cultivos; Subtrópico. |
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Thesagro: |
Aveia forrageira; Avena strigosa; Cajanus cajan; Dolichos lablab; Efeito Estufa; Ervilhaça; Feijão de corda; Gramínea forrageira; Guandu; Leguminosa; Manejo do solo; Plantio direto; Rotação de cultura; Solo; Vicia sativa; Vigna unguiculata. |
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Thesaurus NAL: |
Cover crops; Crop rotation; Forage grasses; Greenhouse gas emissions; Legumes; Nitrous oxide; No-tillage; Soil management; Subtropics. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/50000/1/14.pdf
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Marc: |
LEADER 03529naa a2200673 a 4500
001 1580446
005 2011-12-12
008 2009 bl uuuu u00u1 u #d
024 7 $a10.1016/j.still.2009.10.001$2DOI
100 1 $aGOMES, J.
245 $aSoil nitrous oxide emissions in long-term cover crops-based rotations under subtropical climate.$h[electronic resource]
260 $c2009
520 $aIt has been shown that cover crops can enhance soil nitrous oxide (N2O) emissions, but the magnitude of increase depends on the quantity and quality of the crop residues. Therefore, this study aimed to evaluate the effect of long-term (19 and 21 years) no-till maize crop rotations including grass [black oat (Avena strigosa Schreb)] and legume cover crops [vetch (Vigna sativa L.), cowpea (Vigna unguiculata L. Walp), pigeon pea (Cajanus cajan L. Millsp.) and lablab (Dolichos lablab)] on annual soil N2O emissions in a subtropical Acrisol in Southern Brazil. Greater soil N2O emissions were observed in the first 45 days after the cover crop residue management in all crop rotations, varying from -20.2 ± 1.9 to 163.9 ± 24.3 ug N m-2 h-1. Legume-based crop rotations had the largest cumulative emissions in this period, which were directly related to the quantity of N (r2 = 0.60, p = 0.13) and inversely related to the lignin:N ratio (r2 = 0.89, p = 0.01) of the cover crop residues. After this period, the mean fluxes were smaller and were closely related to the total soil N stocks (r2 = 0.96, p = 0.002). The annual soil N2O emission represented 0.39-0.75% of the total N added by the legume cover crops. Management-controlled soil variables such as mineral N (NO3- and NH4+) and dissolved organic C influenced more the N2O fluxes than environmental-related variables as water-filled pore space and air and soil temperature. Consequently, the synchronization between N mineralization and N uptake by plants seems to be the main challenge to reduce N2O emissions while maintaining the environmental and agronomic services provided by legume cover crops in agricultural systems.
650 $aCover crops
650 $aCrop rotation
650 $aForage grasses
650 $aGreenhouse gas emissions
650 $aLegumes
650 $aNitrous oxide
650 $aNo-tillage
650 $aSoil management
650 $aSubtropics
650 $aAveia forrageira
650 $aAvena strigosa
650 $aCajanus cajan
650 $aDolichos lablab
650 $aEfeito Estufa
650 $aErvilhaça
650 $aFeijão de corda
650 $aGramínea forrageira
650 $aGuandu
650 $aLeguminosa
650 $aManejo do solo
650 $aPlantio direto
650 $aRotação de cultura
650 $aSolo
650 $aVicia sativa
650 $aVigna unguiculata
653 $aAveia preta
653 $aCaupi
653 $aCero labranza
653 $aClima subtropical
653 $aCultivo de cobertura
653 $aCultivos de cobertura
653 $aEmisiones de gases de efecto invernadero
653 $aLabe-labe
653 $aLegumbres
653 $aManejo del suelo
653 $aÓxido nitroso
653 $aPastos forrajeros
653 $aRotación de cultivos
653 $aSubtrópico
700 1 $aBAYER, C.
700 1 $aCOSTA, F. de S.
700 1 $aPICCOLO, M. de C.
700 1 $aZANATTA, J. A.
700 1 $aVIEIRA, F. C. B.
700 1 $aSIX, J.
773 $tSoil & Tillage Research$gv. 106, n. 1, p. 36-44, Dec. 2009.
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Embrapa Agropecuária Oeste (CPAO) |
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