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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
14/10/2009 |
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Data da última atualização: |
10/09/2012 |
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Autoria: |
OLIVEIRA, V. dos S. |
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Título: |
Influência da fragmentação florestal sobre a comunidade de formigas epigêicas (Hymenoptera, Formicidae) em Alter do Chão, Santarém (PA). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
2008. |
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Páginas: |
53 f. |
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Idioma: |
Português |
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Notas: |
Dissertação (Mestrado em Entomologia) - Instituto Nacional de Pesquisas da Amazônia, Universidade Federal do Amazonas, Manaus. |
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Conteúdo: |
A relação entre a riqueza de formigas e as variáveis espaciais, tamanho e isolamento do fragmento, foi avaliada em áreas próximas à região de Alter do Chão. As coletas foram em nove unidades amostrais na área de mata contínua e vinte e um fragmentos cercados por savana. Foram coletadas 6.100 formigas pertencentes a 9 subfamílias, 26 gêneros e 57 espécies/morfoespécies. O total de táxons encontrados na mata contínua (33) foi semelhante ao número esperado a ser encontrado nos fragmentos (32) com o mesmo esforço amostral. Algumas espécies ocorreram somente em uma área de estudo, sendo que 24 foram exclusivas dos fragmentos e 7 da mata contínua. A riqueza de espécies foi significativa e positivamente relacionada apenas com o tamanho do fragmento. A elevada riqueza de espécies registrada nestes fragmentos pode estar representando um equilíbrio ou uma tendência ao equilíbrio nas mudanças ambientais sofridas na época do isolamento. |
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Palavras-Chave: |
Alter do Chão; Brasil; Fragmento; Pará; Santarém; Savanas amazônicas. |
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Thesagro: |
Formiga. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01684nam a2200217 a 4500
001 1668184
005 2012-09-10
008 2008 bl uuuu m 00u1 u #d
100 1 $aOLIVEIRA, V. dos S.
245 $aInfluência da fragmentação florestal sobre a comunidade de formigas epigêicas (Hymenoptera, Formicidae) em Alter do Chão, Santarém (PA).
260 $a2008.$c2008
300 $a53 f.
500 $aDissertação (Mestrado em Entomologia) - Instituto Nacional de Pesquisas da Amazônia, Universidade Federal do Amazonas, Manaus.
520 $aA relação entre a riqueza de formigas e as variáveis espaciais, tamanho e isolamento do fragmento, foi avaliada em áreas próximas à região de Alter do Chão. As coletas foram em nove unidades amostrais na área de mata contínua e vinte e um fragmentos cercados por savana. Foram coletadas 6.100 formigas pertencentes a 9 subfamílias, 26 gêneros e 57 espécies/morfoespécies. O total de táxons encontrados na mata contínua (33) foi semelhante ao número esperado a ser encontrado nos fragmentos (32) com o mesmo esforço amostral. Algumas espécies ocorreram somente em uma área de estudo, sendo que 24 foram exclusivas dos fragmentos e 7 da mata contínua. A riqueza de espécies foi significativa e positivamente relacionada apenas com o tamanho do fragmento. A elevada riqueza de espécies registrada nestes fragmentos pode estar representando um equilíbrio ou uma tendência ao equilíbrio nas mudanças ambientais sofridas na época do isolamento.
650 $aFormiga
653 $aAlter do Chão
653 $aBrasil
653 $aFragmento
653 $aPará
653 $aSantarém
653 $aSavanas amazônicas
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Embrapa Amazônia Ocidental (CPAA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
11/10/2006 |
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Data da última atualização: |
11/10/2006 |
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Autoria: |
SCHOMBERG, H. H.; ENDALE, D. M.; CALEGARI, A.; PEIXOTO, R. T. dos G.; MIYAZAWA, M.; CABRERA, M. L. |
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Título: |
Influence of cover crops on potential nitrogen availability to succeeding crops in a southern Piedmont soil. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Biology and Fertility of Soils, Boca Raton, v. 42, n. 4, p. 299-307, mar. 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
Winter cover crops are essential in conservation tillage systems to protect soils from erosion and for improving soil productivity. Black oat (Avena strigosa Schereb) and oliseed radish ( Raphanus sativus L.) could be useful cover crops in the southeastern USA, but successful adoption requires understanding their unfluence on N availability in conservation tillage systems. Black oat and oilseed radish were compared to crimson clover (trifolium incarnatum L.) and rye ( Secale cereale L.) for biomass production and effects on N mineralization during the summer crop growing season from fall 1998 through summer 2002 near Watkinville, GA. Rye produced 40 to 60% more biomass, although N contents were less than the other cover crops. Oilseed radish and black oat N contents were similar to crimson clover. Black oat, oilseed radish, and crimson clover C/N ratios were less than 30. Where as rye averaged 39. Amount of N mineralized in 90 days (Nmin90) measured with in situ soil cores was 1.3 to 2.2 times greater following black oat , crimson clover, and oilseed radish than following rye. No differences in N min 90 were found between black oats, crimson clover, and oilseed radish in 1999 and 2000. The amount of potentially mineralizable N (N0) was not different due to cover crop, but was 1.5 time greater in 2000 and 2002 than in 1999. The rate of N mineralization (k) was 20 to 50% slower following rye than the other three cover crops. Black oat and oilseed radish biomass production and soil N mineralization dynamics were more similar to crimson clover than to rye, which indicates than they could be used as cover crops in the southeast without significant changes in N recommendations for most crops. MenosWinter cover crops are essential in conservation tillage systems to protect soils from erosion and for improving soil productivity. Black oat (Avena strigosa Schereb) and oliseed radish ( Raphanus sativus L.) could be useful cover crops in the southeastern USA, but successful adoption requires understanding their unfluence on N availability in conservation tillage systems. Black oat and oilseed radish were compared to crimson clover (trifolium incarnatum L.) and rye ( Secale cereale L.) for biomass production and effects on N mineralization during the summer crop growing season from fall 1998 through summer 2002 near Watkinville, GA. Rye produced 40 to 60% more biomass, although N contents were less than the other cover crops. Oilseed radish and black oat N contents were similar to crimson clover. Black oat, oilseed radish, and crimson clover C/N ratios were less than 30. Where as rye averaged 39. Amount of N mineralized in 90 days (Nmin90) measured with in situ soil cores was 1.3 to 2.2 times greater following black oat , crimson clover, and oilseed radish than following rye. No differences in N min 90 were found between black oats, crimson clover, and oilseed radish in 1999 and 2000. The amount of potentially mineralizable N (N0) was not different due to cover crop, but was 1.5 time greater in 2000 and 2002 than in 1999. The rate of N mineralization (k) was 20 to 50% slower following rye than the other three cover crops. Black oat and oilseed radish biomass production an... Mostrar Tudo |
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Palavras-Chave: |
N. |
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Thesagro: |
Nitrogênio; Solo. |
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Thesaurus NAL: |
nitrogen; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02401naa a2200241 a 4500
001 1628949
005 2006-10-11
008 2006 bl --- 0-- u #d
100 1 $aSCHOMBERG, H. H.
245 $aInfluence of cover crops on potential nitrogen availability to succeeding crops in a southern Piedmont soil.
260 $c2006
520 $aWinter cover crops are essential in conservation tillage systems to protect soils from erosion and for improving soil productivity. Black oat (Avena strigosa Schereb) and oliseed radish ( Raphanus sativus L.) could be useful cover crops in the southeastern USA, but successful adoption requires understanding their unfluence on N availability in conservation tillage systems. Black oat and oilseed radish were compared to crimson clover (trifolium incarnatum L.) and rye ( Secale cereale L.) for biomass production and effects on N mineralization during the summer crop growing season from fall 1998 through summer 2002 near Watkinville, GA. Rye produced 40 to 60% more biomass, although N contents were less than the other cover crops. Oilseed radish and black oat N contents were similar to crimson clover. Black oat, oilseed radish, and crimson clover C/N ratios were less than 30. Where as rye averaged 39. Amount of N mineralized in 90 days (Nmin90) measured with in situ soil cores was 1.3 to 2.2 times greater following black oat , crimson clover, and oilseed radish than following rye. No differences in N min 90 were found between black oats, crimson clover, and oilseed radish in 1999 and 2000. The amount of potentially mineralizable N (N0) was not different due to cover crop, but was 1.5 time greater in 2000 and 2002 than in 1999. The rate of N mineralization (k) was 20 to 50% slower following rye than the other three cover crops. Black oat and oilseed radish biomass production and soil N mineralization dynamics were more similar to crimson clover than to rye, which indicates than they could be used as cover crops in the southeast without significant changes in N recommendations for most crops.
650 $anitrogen
650 $asoil
650 $aNitrogênio
650 $aSolo
653 $aN
700 1 $aENDALE, D. M.
700 1 $aCALEGARI, A.
700 1 $aPEIXOTO, R. T. dos G.
700 1 $aMIYAZAWA, M.
700 1 $aCABRERA, M. L.
773 $tBiology and Fertility of Soils, Boca Raton$gv. 42, n. 4, p. 299-307, mar. 2006.
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