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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
06/09/1995 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
GROVE, T. S.; O'CONNEL, A. M.; MALAJCZUK, N. |
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Título: |
Effects of fire on the growth, nutrient content and rate of nitrogen fixation of the Cycad Macrozamia riedlei. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Australian Journal of Botany, v.28, n.3, p.271-281, 1980. |
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Idioma: |
Inglês |
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Conteúdo: |
The response of Macrozamia riedli (Gaud.) C.A. Gardn. to fire, and its contribution to the input of nitrogen to the jarrah (Eucalyptus marginata Donn ex Sm.) forest ecosystem pof south-western Australia, were studied by measuring the biomass and nutrient content of plant parts and the nitrogenase activity of coralloid roots, in relation to time since burning. Leaf growth was rapid the first year following fire. In forest burnt 1-5 years previously, the ratio of weight of leaves to weight of bole did not differ significantly between sites. On a site burnt 7 years previously a reduced proportion of leaves in the total plant biomass was attributed to a yellowing and senescence of leaves. The ratio of weight of coralloid roots to weight of boles was greates on the most recently burnt side. Concentrations of nitrogen and phosphorus in leaves and phosphorus, potassium and zinc in coralloid roots, were significantly higher in plants growing in recently burnt forest. Concentrations of calcium, sodium and chlorine in leaves were higher on sites which had not been burnt recently. The rate of acetyle reduction, expressed per unit of bole weight, was greatest where forest had been burnt 1 year before sampling and decreased to a minimum where burning had occurred 7 years previously. This trend resulted from a decrease in both the weight and nitrogenase activcity of coralloid roots with increasing time since burning. estimated rates of nitrogen fixation were 8.4 and 1.4 kg ha-1 year-1 on sites burnt 1.5 and 7 years previously. In the period between successive prescribed burns (5 to 7 years). M. riedlei was estimated to fix c. 35 kg nitrogen ha-1. This appears to be a significant input in relation to the nitrogen balance of the jarrah forest ecosystem. MenosThe response of Macrozamia riedli (Gaud.) C.A. Gardn. to fire, and its contribution to the input of nitrogen to the jarrah (Eucalyptus marginata Donn ex Sm.) forest ecosystem pof south-western Australia, were studied by measuring the biomass and nutrient content of plant parts and the nitrogenase activity of coralloid roots, in relation to time since burning. Leaf growth was rapid the first year following fire. In forest burnt 1-5 years previously, the ratio of weight of leaves to weight of bole did not differ significantly between sites. On a site burnt 7 years previously a reduced proportion of leaves in the total plant biomass was attributed to a yellowing and senescence of leaves. The ratio of weight of coralloid roots to weight of boles was greates on the most recently burnt side. Concentrations of nitrogen and phosphorus in leaves and phosphorus, potassium and zinc in coralloid roots, were significantly higher in plants growing in recently burnt forest. Concentrations of calcium, sodium and chlorine in leaves were higher on sites which had not been burnt recently. The rate of acetyle reduction, expressed per unit of bole weight, was greatest where forest had been burnt 1 year before sampling and decreased to a minimum where burning had occurred 7 years previously. This trend resulted from a decrease in both the weight and nitrogenase activcity of coralloid roots with increasing time since burning. estimated rates of nitrogen fixation were 8.4 and 1.4 kg ha-1 year-1 on ... Mostrar Tudo |
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Palavras-Chave: |
Cycad macrozamia riedlei; Efeito; Effect; Fire; Growth; Plant. |
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Thesagro: |
Crescimento; Fogo; Planta. |
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Categoria do assunto: |
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Marc: |
LEADER 02444naa a2200253 a 4500
001 1786045
005 2017-04-05
008 1980 bl --- 0-- u #d
100 1 $aGROVE, T. S.
245 $aEffects of fire on the growth, nutrient content and rate of nitrogen fixation of the Cycad Macrozamia riedlei.
260 $c1980
520 $aThe response of Macrozamia riedli (Gaud.) C.A. Gardn. to fire, and its contribution to the input of nitrogen to the jarrah (Eucalyptus marginata Donn ex Sm.) forest ecosystem pof south-western Australia, were studied by measuring the biomass and nutrient content of plant parts and the nitrogenase activity of coralloid roots, in relation to time since burning. Leaf growth was rapid the first year following fire. In forest burnt 1-5 years previously, the ratio of weight of leaves to weight of bole did not differ significantly between sites. On a site burnt 7 years previously a reduced proportion of leaves in the total plant biomass was attributed to a yellowing and senescence of leaves. The ratio of weight of coralloid roots to weight of boles was greates on the most recently burnt side. Concentrations of nitrogen and phosphorus in leaves and phosphorus, potassium and zinc in coralloid roots, were significantly higher in plants growing in recently burnt forest. Concentrations of calcium, sodium and chlorine in leaves were higher on sites which had not been burnt recently. The rate of acetyle reduction, expressed per unit of bole weight, was greatest where forest had been burnt 1 year before sampling and decreased to a minimum where burning had occurred 7 years previously. This trend resulted from a decrease in both the weight and nitrogenase activcity of coralloid roots with increasing time since burning. estimated rates of nitrogen fixation were 8.4 and 1.4 kg ha-1 year-1 on sites burnt 1.5 and 7 years previously. In the period between successive prescribed burns (5 to 7 years). M. riedlei was estimated to fix c. 35 kg nitrogen ha-1. This appears to be a significant input in relation to the nitrogen balance of the jarrah forest ecosystem.
650 $aCrescimento
650 $aFogo
650 $aPlanta
653 $aCycad macrozamia riedlei
653 $aEfeito
653 $aEffect
653 $aFire
653 $aGrowth
653 $aPlant
700 1 $aO'CONNEL, A. M.
700 1 $aMALAJCZUK, N.
773 $tAustralian Journal of Botany$gv.28, n.3, p.271-281, 1980.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
19/03/2009 |
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Data da última atualização: |
02/08/2023 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
RAMOS, S. R. R.; SANTOS, E. P. A. dos; FREIRE FILHO, F. R.; ROCHA, M. de M.; RIBEIRO, V. Q.; LOPES, Â. C. de A.; SOBRAL, P. V. C. |
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Afiliação: |
Semíramis Rabelo Ramalho Ramos, Embrapa Tabuleiros Costeiros; Erinalda Paz Amorim dos Santos, Estagiária/ Embrapa Meio-Norte; Francisco Rodrigues Freire Filho, Embrapa Meio-Norte; Maurisrael de Moura Rocha, Embrapa Meio-Norte; Valdenir Queiroz Ribeiro, Embrapa Meio-Norte; Ângela Celis de Almeida Lopes, Estagiária/ Embrapa Meio-Norte; Paula Verena Carvalho Sobral, Estagiária/ Embrapa Meio-Norte. |
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Título: |
Descrição morfoagronômica de acessos de feijão-caupi e feijão-mungo introduzidos no Banco Ativo de Germoplasma da Embrapa Meio-Norte: dados quantitativos. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Teresina: Embrapa Meio-Norte, 2008. |
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Páginas: |
20 p. |
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Série: |
(Embrapa Meio-Norte. Boletim de Pesquisa e Desenvolvimento, 80). |
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Idioma: |
Português |
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Conteúdo: |
O trabalho objetivou descrever e diferenciar, preliminarmente, 35 acessos de feijão-caupi e 23 de feijão-mungo introduzidos no Banco Ativo de Germoplasma. O experimento foi conduzido no campo experimental da Embrapa Meio-Norte, em Teresina, PI, no período de maio a dezembro de 2003, em condições de telado. A parcela foi constituída por uma fileira de 20 plantas e os dados foram obtidos em seis plantas escolhidas aleatoriamente. Foram utilizados os seguintes descritores: altura e largura da planta, número de internódios no ramo principal, número de dias para antese, altura de inserção da vagem superior, comprimento do pedúnculo, número de vagens por planta, comprimento de vagem, número de grãos por vagem, peso de 100 grãos e produção de grãos por planta. A caracterização foi eficiente na descrição preliminar das espécies e na identificação de acessos potenciais a serem incorporados em programas de pré-melhoramento de feijão-caupi. |
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Thesagro: |
Feijão; Melhoramento Genético Vegetal; Morfologia Vegetal; Recurso Genético. |
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Categoria do assunto: |
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G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/80674/1/boletim-80.PDF
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Marc: |
LEADER 01817nam a2200253 a 4500
001 1070681
005 2023-08-02
008 2008 bl uuuu u0uu1 u #d
100 1 $aRAMOS, S. R. R.
245 $aDescrição morfoagronômica de acessos de feijão-caupi e feijão-mungo introduzidos no Banco Ativo de Germoplasma da Embrapa Meio-Norte$bdados quantitativos.
260 $aTeresina: Embrapa Meio-Norte$c2008
300 $a20 p.
490 $a(Embrapa Meio-Norte. Boletim de Pesquisa e Desenvolvimento, 80).
520 $aO trabalho objetivou descrever e diferenciar, preliminarmente, 35 acessos de feijão-caupi e 23 de feijão-mungo introduzidos no Banco Ativo de Germoplasma. O experimento foi conduzido no campo experimental da Embrapa Meio-Norte, em Teresina, PI, no período de maio a dezembro de 2003, em condições de telado. A parcela foi constituída por uma fileira de 20 plantas e os dados foram obtidos em seis plantas escolhidas aleatoriamente. Foram utilizados os seguintes descritores: altura e largura da planta, número de internódios no ramo principal, número de dias para antese, altura de inserção da vagem superior, comprimento do pedúnculo, número de vagens por planta, comprimento de vagem, número de grãos por vagem, peso de 100 grãos e produção de grãos por planta. A caracterização foi eficiente na descrição preliminar das espécies e na identificação de acessos potenciais a serem incorporados em programas de pré-melhoramento de feijão-caupi.
650 $aFeijão
650 $aMelhoramento Genético Vegetal
650 $aMorfologia Vegetal
650 $aRecurso Genético
700 1 $aSANTOS, E. P. A. dos
700 1 $aFREIRE FILHO, F. R.
700 1 $aROCHA, M. de M.
700 1 $aRIBEIRO, V. Q.
700 1 $aLOPES, Â. C. de A.
700 1 $aSOBRAL, P. V. C.
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Embrapa Meio-Norte (CPAMN) |
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