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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
24/03/2003 |
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Data da última atualização: |
21/12/2011 |
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Autoria: |
NEUFELDT, H.; RESCK, D. V. S.; AYARZA, M. A. |
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Título: |
Texture and land-use effects on soil organic matter in Cerrado Oxisols, Central Brazil. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 107, p. 151-164, 2002. |
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Idioma: |
Inglês |
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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 |
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Thesagro: |
Cerrado; Cobertura do Solo; Matéria Orgânica; Solo. |
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Categoria do assunto: |
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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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| 4. |  | RODRIGUES, L. O.; VILELA, L.; AYARZA, M. A.; KITAYAMA, K. Avaliacao da fauna do solo sob varios sistemas de manejo em um latossolo da regiao dos cerrados. In: SIMPOSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasilia, DF. Biodiversidade e producao sustentavel de alimentos e fibras nos Cerrados: anais... Planaltina: EMBRAPA-CPAC, 1996. p.375-378.| Biblioteca(s): Embrapa Cerrados. |
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| 6. | | VILELA, L.; AYARZA, M. A.; MIRANDA, J. C. C. de. Agropastoral systems: activities developed by Cerrados Agricultural Research Center (Embrapa Cerrados). In: KANNO, T.; MACEDO, M.C.M., ed. JIRCAS / EMBRAPA gado de corte international joint workshop on agropastoral system in South America. [Tsukuba]: JIRCAS, 2001. p.19-33. (JIRCAS Working Report, 19). EMBRAPA-CNPGC and JIRCAS joint International Workshop on Agrospatoral System in South America, held in Campo Grande, MS, Brazil, 1999.| Biblioteca(s): Embrapa Cerrados. |
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| 16. | | RAMOS, A. K. B.; PIZARRO, E. A.; AYARZA, M. A.; CARVALHO, M. A.; COSTA, P. H. Avaliacao agronomica de gramineas forrageiras consorciadas com Stylosanthes guianensis Cv. Mineirao em Uberlandia - MG. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33., 1996, Fortaleza, CE. Anais... Fortaleza: SBZ, 1996. v.2. p.206-208.| Biblioteca(s): Embrapa Cerrados. |
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| 17. | | PIZARRO, E. A.; RAMOS, A. K. B.; AYARZA, M. A.; CARVALHO, M. A.; COSTA, P. H. Avaliacao agronomica de leguminosas forrageiras consorciadas com B. decumbens em Uberlandia - MG. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33., 1996, Fortaleza, CE. Anais... Fortaleza: SBZ, 1996. v.2. p.209-211.| Biblioteca(s): Embrapa Cerrados. |
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| 20. | | WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. Aggregation studied by laser diffraction in relation to plowing and liming in the Cerrado region in Brazil. Geoderma, Amsterdam, v.90, p.277-290, 1999.| Biblioteca(s): Embrapa Cerrados. |
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