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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
24/03/2003 |
Data da última atualização: |
21/12/2011 |
Autoria: |
NEUFELDT, H.; RESCK, D. V. S.; AYARZA, M. A. |
Título: |
Texture and land-use effects on soil organic matter in Cerrado Oxisols, Central Brazil. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Geoderma, Amsterdam, v. 107, p. 151-164, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Due to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisation of organic matter in Cerrado soils follow along a biogechemical gradient similar to that of temperate soils and climates. MenosDue to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisa... Mostrar Tudo |
Thesagro: |
Cerrado; Cobertura do Solo; Matéria Orgânica; Solo. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02157naa a2200193 a 4500 001 1566612 005 2011-12-21 008 2002 bl --- 0-- u #d 100 1 $aNEUFELDT, H. 245 $aTexture and land-use effects on soil organic matter in Cerrado Oxisols, Central Brazil. 260 $c2002 520 $aDue to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisation of organic matter in Cerrado soils follow along a biogechemical gradient similar to that of temperate soils and climates. 650 $aCerrado 650 $aCobertura do Solo 650 $aMatéria Orgânica 650 $aSolo 700 1 $aRESCK, D. V. S. 700 1 $aAYARZA, M. A. 773 $tGeoderma, Amsterdam$gv. 107, p. 151-164, 2002.
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Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Trigo. |
Data corrente: |
20/10/2010 |
Data da última atualização: |
20/10/2010 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
MORÁS, A.; RUTZ, D.; PINO, M.; BOHN, A.; LORINI, I.; ELIAS, M. C. |
Afiliação: |
IRINEU LORINI, CNPSO; MOACIR CARDOSO ELIAS, UFPEL. |
Título: |
Uso de terra de diatomácea e ácido propiônico como alternativa para controle de insetos em arroz armazenado. |
Ano de publicação: |
2008 |
Fonte/Imprenta: |
In: SIMPÓSIO SUL-BRASILEIRO DE QUALIDADE DE ARROZ, 3., 2008, Camaquã. Anais... Pelotas: Abrapós: Universidade Federal de Pelotas, 2008. p. 171-178. |
Idioma: |
Português |
Palavras-Chave: |
Insetos. |
Thesagro: |
Arroz. |
Categoria do assunto: |
O Insetos e Entomologia |
Marc: |
LEADER 00642naa a2200193 a 4500 001 1864795 005 2010-10-20 008 2008 bl uuuu u00u1 u #d 100 1 $aMORÁS, A. 245 $aUso de terra de diatomácea e ácido propiônico como alternativa para controle de insetos em arroz armazenado. 260 $c2008 650 $aArroz 653 $aInsetos 700 1 $aRUTZ, D. 700 1 $aPINO, M. 700 1 $aBOHN, A. 700 1 $aLORINI, I. 700 1 $aELIAS, M. C. 773 $tIn: SIMPÓSIO SUL-BRASILEIRO DE QUALIDADE DE ARROZ, 3., 2008, Camaquã. Anais... Pelotas: Abrapós: Universidade Federal de Pelotas, 2008. p. 171-178.
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