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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
27/08/2009 |
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Data da última atualização: |
27/08/2009 |
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Autoria: |
LIMA; I. L. de; FLORSHEIM, S. M. B.; LONGUI, E. L. |
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Título: |
Influência do espaçamento em algumas propriedades fisicas da madeira de Tectona grandis Linn. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Cerne, Lavras, v. 15, n. 2, p. 244-250, abr./jun. 2009. |
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Idioma: |
Português |
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Conteúdo: |
A Tectona grandis (teca) destaca-se pela produtividade e qualidade de sua madeira. O espaçamento ideal das árvores com
o qual se obtém uma maior proporção de madeira e melhor qualidade é uma das questões a serem consideradas nas pesquisas de manejo
florestal de teca. Conduziu-se este trabalho, com o objetivo de verificar a influência do espaçamento em algumas das propriedades
físicas da madeira de Tectona grandis, aos 31 anos de idade e a variabilidade radial dessas propriedades. Neste estudo, utilizou-se o
delineamento experimental de blocos casualizados com 3 tratamentos (3 x 1,5 m; 3 x 2 m e 3 x 2,5 m) e 5 repetições, onde foram
amostradas 15 árvores de diâmetro médio em populações na região de Pederneiras/SP. Em cada árvore foi retirado um disco de 7 cm
de espessura na região do DAP (diâmetro a altura do peito) e de cada disco foram retiradas amostras em diferentes posições radiais na
direção medula-casca (medula, centro e casca). As propriedades estudadas foram: densidade aparente, retração volumétrica e densidade
básica. De acordo com os resultados obtidos, pôde-se concluir que o espaçamento das árvores influenciou significativamente somente
na densidade aparente, sendo que espaçamentos maiores diferiram dos menores. Também ocorreu um aumento no sentido da medula
para a casca, apenas para a densidade aparente. |
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Palavras-Chave: |
Densidade aparente; Densidade básica; Retração volumétrica. |
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Thesagro: |
Teca. |
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Categoria do assunto: |
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Marc: |
LEADER 01957naa a2200205 a 4500
001 1316284
005 2009-08-27
008 2009 bl uuuu u00u1 u #d
100 1 $aLIMA
245 $aInfluência do espaçamento em algumas propriedades fisicas da madeira de Tectona grandis Linn.
260 $c2009
520 $aA Tectona grandis (teca) destaca-se pela produtividade e qualidade de sua madeira. O espaçamento ideal das árvores com o qual se obtém uma maior proporção de madeira e melhor qualidade é uma das questões a serem consideradas nas pesquisas de manejo florestal de teca. Conduziu-se este trabalho, com o objetivo de verificar a influência do espaçamento em algumas das propriedades físicas da madeira de Tectona grandis, aos 31 anos de idade e a variabilidade radial dessas propriedades. Neste estudo, utilizou-se o delineamento experimental de blocos casualizados com 3 tratamentos (3 x 1,5 m; 3 x 2 m e 3 x 2,5 m) e 5 repetições, onde foram amostradas 15 árvores de diâmetro médio em populações na região de Pederneiras/SP. Em cada árvore foi retirado um disco de 7 cm de espessura na região do DAP (diâmetro a altura do peito) e de cada disco foram retiradas amostras em diferentes posições radiais na direção medula-casca (medula, centro e casca). As propriedades estudadas foram: densidade aparente, retração volumétrica e densidade básica. De acordo com os resultados obtidos, pôde-se concluir que o espaçamento das árvores influenciou significativamente somente na densidade aparente, sendo que espaçamentos maiores diferiram dos menores. Também ocorreu um aumento no sentido da medula para a casca, apenas para a densidade aparente.
650 $aTeca
653 $aDensidade aparente
653 $aDensidade básica
653 $aRetração volumétrica
700 1 $aI. L. de
700 1 $aFLORSHEIM, S. M. B.
700 1 $aLONGUI, E. L.
773 $tCerne, Lavras$gv. 15, n. 2, p. 244-250, abr./jun. 2009.
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Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
21/08/2008 |
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Data da última atualização: |
22/08/2008 |
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Autoria: |
BROWN, G. G.; MARTINS, P. T.; MATSUMURA, C.; SILVA, S. H. da; FERRARI, E.; KORASAKI, V.; PASINI, A. |
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Título: |
Growth of Pontoscolex corethrurus in an oxisol mixed or not with different amounts of sand and/or organic matter. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
In: International Symposium on Earthworm Ecology, 8., 2006, Kraków. Abstracts... Kraków: Jagiellonian University, 2006. p. 61. |
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Idioma: |
Inglês |
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Conteúdo: |
Pontoscolex corethrurus is a pantropical geophagous endogeic earthworm species native to the Guyana Shield area in Northern Brazil. It is found throughout the country, mainly in disturbed ecosystems, although it also may inhabit natural ecosystems far from its original habitat, where it must be considered an exotic invasive species. Its distribution has been associated with a wide-ranging tolerance to different soil types and environments (Lavelle et al., 1987). However, the species is rare in agricultural fields of Northern Paraná State, Brazil. Therefore, the present study was undertaken to evaluate possible soil limitations for the colonization of this species at the Embrapa Soybean experiment station (Londrina, Brazil). P. corethrurus were incubated at 27ºC in the laboratory, using the Rhodic Hapludox from the station and different amounts of added organic matter (OM; composted city organic wastes) and sand. The following treatments were used: 100% soil; soil+2% (weight) OM; soil+4% OM; soil+10% OM; soil+10% sand; soil+30% sand; soil+60% sand. A potting mixture used in the greenhouse (70%soil, 20%sand, 10%OM) was also tested. Mean C content of the mixtures ranged from 1.2 to 4.3% and sand contents from 8 to 76%. Each container (10 cm square plastic box) received about 140g air-dry substrate, and water at 70-80% field capacity. Each box had 1 specimen and each treatment was replicated 14 times. The worms were cultivated for 395 d, and the substrates changed approximately every 20 d. After 1 yr, only 5 worms were alive in the soil+60% sand treatment and>9 individuals in the remaining treatments. A negative relationship was observed between sand content and earthworm biomass (R2 = 0,60). Worm biomass and soil C content showed a polynomial relationship (R2 = 0,89), with maximum values at 2.8% C. Positive linear correlations (R2 = 0,5) with soil P and Mg were also observed. Worms grew best in soil+2% OM, followed by soil+10% sand, soil+4% OM, soil 100%, and soil+30% sand. These results indicate that the soil from Embrapa Soybean is adequate for the development of P. corethrurus, and that some other factor must be limiting colonization by this species. Furthermore, a small increase in soil OM (from 2.3-2,6% C) could greatly benefit the populations of this species. MenosPontoscolex corethrurus is a pantropical geophagous endogeic earthworm species native to the Guyana Shield area in Northern Brazil. It is found throughout the country, mainly in disturbed ecosystems, although it also may inhabit natural ecosystems far from its original habitat, where it must be considered an exotic invasive species. Its distribution has been associated with a wide-ranging tolerance to different soil types and environments (Lavelle et al., 1987). However, the species is rare in agricultural fields of Northern Paraná State, Brazil. Therefore, the present study was undertaken to evaluate possible soil limitations for the colonization of this species at the Embrapa Soybean experiment station (Londrina, Brazil). P. corethrurus were incubated at 27ºC in the laboratory, using the Rhodic Hapludox from the station and different amounts of added organic matter (OM; composted city organic wastes) and sand. The following treatments were used: 100% soil; soil+2% (weight) OM; soil+4% OM; soil+10% OM; soil+10% sand; soil+30% sand; soil+60% sand. A potting mixture used in the greenhouse (70%soil, 20%sand, 10%OM) was also tested. Mean C content of the mixtures ranged from 1.2 to 4.3% and sand contents from 8 to 76%. Each container (10 cm square plastic box) received about 140g air-dry substrate, and water at 70-80% field capacity. Each box had 1 specimen and each treatment was replicated 14 times. The worms were cultivated for 395 d, and the substrates changed approximately ... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02947naa a2200193 a 4500
001 1470761
005 2008-08-22
008 2006 bl --- 0-- u #d
100 1 $aBROWN, G. G.
245 $aGrowth of Pontoscolex corethrurus in an oxisol mixed or not with different amounts of sand and/or organic matter.
260 $c2006
520 $aPontoscolex corethrurus is a pantropical geophagous endogeic earthworm species native to the Guyana Shield area in Northern Brazil. It is found throughout the country, mainly in disturbed ecosystems, although it also may inhabit natural ecosystems far from its original habitat, where it must be considered an exotic invasive species. Its distribution has been associated with a wide-ranging tolerance to different soil types and environments (Lavelle et al., 1987). However, the species is rare in agricultural fields of Northern Paraná State, Brazil. Therefore, the present study was undertaken to evaluate possible soil limitations for the colonization of this species at the Embrapa Soybean experiment station (Londrina, Brazil). P. corethrurus were incubated at 27ºC in the laboratory, using the Rhodic Hapludox from the station and different amounts of added organic matter (OM; composted city organic wastes) and sand. The following treatments were used: 100% soil; soil+2% (weight) OM; soil+4% OM; soil+10% OM; soil+10% sand; soil+30% sand; soil+60% sand. A potting mixture used in the greenhouse (70%soil, 20%sand, 10%OM) was also tested. Mean C content of the mixtures ranged from 1.2 to 4.3% and sand contents from 8 to 76%. Each container (10 cm square plastic box) received about 140g air-dry substrate, and water at 70-80% field capacity. Each box had 1 specimen and each treatment was replicated 14 times. The worms were cultivated for 395 d, and the substrates changed approximately every 20 d. After 1 yr, only 5 worms were alive in the soil+60% sand treatment and>9 individuals in the remaining treatments. A negative relationship was observed between sand content and earthworm biomass (R2 = 0,60). Worm biomass and soil C content showed a polynomial relationship (R2 = 0,89), with maximum values at 2.8% C. Positive linear correlations (R2 = 0,5) with soil P and Mg were also observed. Worms grew best in soil+2% OM, followed by soil+10% sand, soil+4% OM, soil 100%, and soil+30% sand. These results indicate that the soil from Embrapa Soybean is adequate for the development of P. corethrurus, and that some other factor must be limiting colonization by this species. Furthermore, a small increase in soil OM (from 2.3-2,6% C) could greatly benefit the populations of this species.
700 1 $aMARTINS, P. T.
700 1 $aMATSUMURA, C.
700 1 $aSILVA, S. H. da
700 1 $aFERRARI, E.
700 1 $aKORASAKI, V.
700 1 $aPASINI, A.
773 $tIn: International Symposium on Earthworm Ecology, 8., 2006, Kraków. Abstracts... Kraków: Jagiellonian University, 2006. p. 61.
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