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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas; Embrapa Solos. |
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Data corrente: |
15/06/2011 |
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Data da última atualização: |
03/11/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
LIMA, J. A. de S.; VILLELA, D. M.; CALDERANO FILHO, B.; PEREZ, D. V. |
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Afiliação: |
JORGE ARAUJO DE SOUSA LIMA, CNPS; DORA MARIA VILLELA, UENF; BRAZ CALDERANO FILHO, CNPS; DANIEL VIDAL PEREZ, CNPS. |
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Título: |
Biomassa radicular fina em fragmentos da Mata Atlântica fluminense. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Floresta, Curitiba, v. 41, n. 1, p. 27-38, jan./mar. 2011. |
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DOI: |
http://dx.doi.org/10.5380/rf.v41i1.21177 |
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Idioma: |
Português |
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Conteúdo: |
A escassez de estudos empíricos dos sistemas radiculares limita a precisão das predições relativas à economia de carbono, pois eles representam até 55% da biomassa florestal. Somente as raízes finas (diâmetro <2 mm) respondem por cerca de um terço da produção primária líquida dos ecossistemas terrestres. A hipótese de que a maior disponibilidade de água e nutrientes no solo reduz a alocação de biomassa nas raízes tem sido contestada na literatura científica tanto em relação às raízes finas (BRF) como a toda biomassa radicular. Avaliou-se aqui a correlação (Pearson) entre BRF e variáveis edáficas até 10 cm de profundidade em seis fragmentos florestais (48 amostras.fragmento.estação-1) na Baixada Litorânea Fluminense, nas estações de seca e de chuvas. Os solos apresentaram diferentes níveis de fertilidade. A BRF média geral foi de 641 g.m-2 (florestas similares = 140-1040 g.m-2). As médias de BRF obtidas no período chuvoso ou na várzea foram significativamente mais elevadas. Foram detectadas correlações positivas e significativas de BRF com Ca + Mg, K, P e N. Os resultados não respaldam a hipótese de redução da BRF em resposta ao aumento de água e nutrientes do solo. |
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Palavras-Chave: |
Biomassa radicular; Florestas tropicais; Fragmentação florestal; Solos florestais; Trópico úmido. |
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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/148150/1/21177-76037-1-PB.pdf
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Marc: |
LEADER 01919naa a2200229 a 4500
001 1918294
005 2021-11-03
008 2011 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.5380/rf.v41i1.21177$2DOI
100 1 $aLIMA, J. A. de S.
245 $aBiomassa radicular fina em fragmentos da Mata Atlântica fluminense.
260 $c2011
520 $aA escassez de estudos empíricos dos sistemas radiculares limita a precisão das predições relativas à economia de carbono, pois eles representam até 55% da biomassa florestal. Somente as raízes finas (diâmetro <2 mm) respondem por cerca de um terço da produção primária líquida dos ecossistemas terrestres. A hipótese de que a maior disponibilidade de água e nutrientes no solo reduz a alocação de biomassa nas raízes tem sido contestada na literatura científica tanto em relação às raízes finas (BRF) como a toda biomassa radicular. Avaliou-se aqui a correlação (Pearson) entre BRF e variáveis edáficas até 10 cm de profundidade em seis fragmentos florestais (48 amostras.fragmento.estação-1) na Baixada Litorânea Fluminense, nas estações de seca e de chuvas. Os solos apresentaram diferentes níveis de fertilidade. A BRF média geral foi de 641 g.m-2 (florestas similares = 140-1040 g.m-2). As médias de BRF obtidas no período chuvoso ou na várzea foram significativamente mais elevadas. Foram detectadas correlações positivas e significativas de BRF com Ca + Mg, K, P e N. Os resultados não respaldam a hipótese de redução da BRF em resposta ao aumento de água e nutrientes do solo.
653 $aBiomassa radicular
653 $aFlorestas tropicais
653 $aFragmentação florestal
653 $aSolos florestais
653 $aTrópico úmido
700 1 $aVILLELA, D. M.
700 1 $aCALDERANO FILHO, B.
700 1 $aPEREZ, D. V.
773 $tFloresta, Curitiba$gv. 41, n. 1, p. 27-38, jan./mar. 2011.
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Registro original: |
Embrapa Solos (CNPS) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
18/08/2011 |
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Data da última atualização: |
06/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
SOUZA, T. C. de; MAGALHAES, P. C.; PEREIRA, F. J.; CASTRO, E. M. de; PARENTONI, S. N. |
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Afiliação: |
PAULO CESAR MAGALHAES, CNPMS; SIDNEY NETTO PARENTONI, CNPMS. |
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Título: |
Morpho-physiology and maize grain yield under periodic soil flooding in successive selection cycles. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Acta Physiologiae Plantarum, v. 33, p. 1877-1885, 2011. |
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DOI: |
DOI 10.1007/s11738-011-0731-y |
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Idioma: |
Português |
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Conteúdo: |
This study was carried out to evaluate maize plants of different recurrent selection cycles of the variety (Zea mays L. Saracura-BRS-4154) regarded to genetic gains, morphophysiology, and grain yield, achieved over the selection cycles under intermittent flooding of the soil. This variety has the capacity to survive and produce in temporarily flooded soils and was developed by the National Maize and Sorghum Research Center (EMBRAPA). The experiment was conducted in greenhouse by using ten alternating selection cycles (Cycle 1?18) and BR107 a variety known for its susceptibility to flooding. The flooding initiated at six-leaf stage by applying 50 mm of water three times a week. At flowering, the following parameters were evaluated: rate of leaf photosynthesis, stomatal conductance, intercellular CO2 concentration, transpiration rate, photosynthetically active leaf area, root porosity, relative chlorophyll content, grain yield, harvest index, ear length, and interval between male and female flowering. Yield as a function of root porosity and photosynthesis were also evaluated. An index was created in this study, in order to help the discussion of the characteristics evaluated, it was called ??Relative Tolerance Value?RTV??, only gaseous exchange measurements was not included in this index. By the way, it was observed throughout the selection cycles an increase in all gaseous exchange parameters, being the cycle 18, the one which presented the greatest averages. RTV for leaf area showed the greatest values for cycles 7 and 18, whereas root porosity, chlorophyll relative content, and harvest index,the greater RTV values were found in cycles 17 and 18. The largest grain yield RTV was observed in cycle 7, followed by cycles 13, 15, and 18. Flooding resulted in longer Anthesis-Silking Interval, especially for the first cycles. At flooding condition, grain yield was strongly related to root porosity (R2=0.66). These results showed that the selection cycles of ??Saracura?? maize improved some morphophysiologic characters, which favor their survival in flooded environments, also resulting in higher productivity. MenosThis study was carried out to evaluate maize plants of different recurrent selection cycles of the variety (Zea mays L. Saracura-BRS-4154) regarded to genetic gains, morphophysiology, and grain yield, achieved over the selection cycles under intermittent flooding of the soil. This variety has the capacity to survive and produce in temporarily flooded soils and was developed by the National Maize and Sorghum Research Center (EMBRAPA). The experiment was conducted in greenhouse by using ten alternating selection cycles (Cycle 1?18) and BR107 a variety known for its susceptibility to flooding. The flooding initiated at six-leaf stage by applying 50 mm of water three times a week. At flowering, the following parameters were evaluated: rate of leaf photosynthesis, stomatal conductance, intercellular CO2 concentration, transpiration rate, photosynthetically active leaf area, root porosity, relative chlorophyll content, grain yield, harvest index, ear length, and interval between male and female flowering. Yield as a function of root porosity and photosynthesis were also evaluated. An index was created in this study, in order to help the discussion of the characteristics evaluated, it was called ??Relative Tolerance Value?RTV??, only gaseous exchange measurements was not included in this index. By the way, it was observed throughout the selection cycles an increase in all gaseous exchange parameters, being the cycle 18, the one which presented the greatest averages. RTV for leaf ar... Mostrar Tudo |
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Palavras-Chave: |
Hipoxia. |
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Thesagro: |
Anoxia; Milho; Zea Mays. |
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Thesaurus NAL: |
Flooding tolerance; Gas exchange. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02882naa a2200253 a 4500
001 1898273
005 2021-08-06
008 2011 bl uuuu u00u1 u #d
024 7 $aDOI 10.1007/s11738-011-0731-y$2DOI
100 1 $aSOUZA, T. C. de
245 $aMorpho-physiology and maize grain yield under periodic soil flooding in successive selection cycles.$h[electronic resource]
260 $c2011
520 $aThis study was carried out to evaluate maize plants of different recurrent selection cycles of the variety (Zea mays L. Saracura-BRS-4154) regarded to genetic gains, morphophysiology, and grain yield, achieved over the selection cycles under intermittent flooding of the soil. This variety has the capacity to survive and produce in temporarily flooded soils and was developed by the National Maize and Sorghum Research Center (EMBRAPA). The experiment was conducted in greenhouse by using ten alternating selection cycles (Cycle 1?18) and BR107 a variety known for its susceptibility to flooding. The flooding initiated at six-leaf stage by applying 50 mm of water three times a week. At flowering, the following parameters were evaluated: rate of leaf photosynthesis, stomatal conductance, intercellular CO2 concentration, transpiration rate, photosynthetically active leaf area, root porosity, relative chlorophyll content, grain yield, harvest index, ear length, and interval between male and female flowering. Yield as a function of root porosity and photosynthesis were also evaluated. An index was created in this study, in order to help the discussion of the characteristics evaluated, it was called ??Relative Tolerance Value?RTV??, only gaseous exchange measurements was not included in this index. By the way, it was observed throughout the selection cycles an increase in all gaseous exchange parameters, being the cycle 18, the one which presented the greatest averages. RTV for leaf area showed the greatest values for cycles 7 and 18, whereas root porosity, chlorophyll relative content, and harvest index,the greater RTV values were found in cycles 17 and 18. The largest grain yield RTV was observed in cycle 7, followed by cycles 13, 15, and 18. Flooding resulted in longer Anthesis-Silking Interval, especially for the first cycles. At flooding condition, grain yield was strongly related to root porosity (R2=0.66). These results showed that the selection cycles of ??Saracura?? maize improved some morphophysiologic characters, which favor their survival in flooded environments, also resulting in higher productivity.
650 $aFlooding tolerance
650 $aGas exchange
650 $aAnoxia
650 $aMilho
650 $aZea Mays
653 $aHipoxia
700 1 $aMAGALHAES, P. C.
700 1 $aPEREIRA, F. J.
700 1 $aCASTRO, E. M. de
700 1 $aPARENTONI, S. N.
773 $tActa Physiologiae Plantarum$gv. 33, p. 1877-1885, 2011.
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