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| 11. |  | RENZ, T. E.; NEUFELDT, H.; AYARZA, M. A.; RESCK, D. V. S.; ZECH, W. Microbial biomass, microbial activity, and carbon pools under different land-use systems in the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.187-197.| Biblioteca(s): Embrapa Cerrados. |
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| 16. | | FUHRMANN, S.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; ZECH, W. Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados. In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. p.110-122.| Biblioteca(s): Embrapa Cerrados. |
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| 18. | | AYARZA, M. A.; THOMAS, R.; ZECH, W.; NEUFELDT, H.; WESTRHOF, R. LILIENFEIN, J.; FREIBAUER, A.; SILVA, J. E. da. Soil indicators of sustainable agropastoral systems. In: CONGRESSO BRASILEIRO DE CIENCIA DO SOLO, 27., 1999, Brasilia, DF. [Ciencia do solo e qualidade de vida: anais]. [Planaltina: Embrapa Cerrados, 1999]. Sessao de posteres 1. Resumo.| Biblioteca(s): Embrapa Cerrados. |
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| 19. | | LILIENFEIN, J.; FREIBAUER, A.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; RESCK, D. V. S.; ZECH, W. Influence of land-use on the distribution of water stable aggregates and P status of sandy and clayey cerrado oxisols, Brazil. 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.323-328.| Biblioteca(s): Embrapa Cerrados. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
15/07/1999 |
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Data da última atualização: |
15/07/1999 |
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Autoria: |
FUHRMANN, S.; NEUFELDT, H.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; ZECH, W. |
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Título: |
Soil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. |
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Páginas: |
p.110-122. |
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Idioma: |
Inglês |
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Conteúdo: |
Intensive farming and grazing on Oxisols of the Brazilian savannas (also known as the Cerrados) are leading to loss of soil organic matter (SOM) and consequently to a decline in fertility and sustainability of the soils. Alternative land-use systems such as the introduction of legumes in pastures and the use of not-tillage systems can reverse this process. In this study, the effects of seven land-use systems (native savanna, forest, degraded pasture, improved pure-grass pastures, improved grass/legumes pastures, convencional cropping, and no-tillage cropping) on the SOM and potentially mineralizable nitrogen (Npot) were examined in whole-soil samples and particle-size separates. In addition, sugars and amino acids were determined for a better understanding of SOM dynamics, soil organic carbon (SOC), cellulosic and noncellulosic polysaccharides (CPs and NCPs, respectively), amino sugars, and Npot decreased under forest and increased under pastures. The positive influence of improved pasture systems, especially the grass/legume pasture, was clearly recognizable. Under the no-tillage systems, SOC and Npot levels increased, compared with conventional tillage. These differences were clearest in the sand fractions of the particle-size separates. The sugar dynamics refleted decomposition of plant tissue and subsequent accumulation of microbial sugars. The ration of glucosamine to muramic acid increased from coarse sand to fine sand and thereafter decreased toward clay. The cause may be a stronger association of fungal hyphae with fine roots in the fine-sand fraction and an increased association of bacteria with the clay fraction. Amino sugars appeared to be an important source of Npot. MenosIntensive farming and grazing on Oxisols of the Brazilian savannas (also known as the Cerrados) are leading to loss of soil organic matter (SOM) and consequently to a decline in fertility and sustainability of the soils. Alternative land-use systems such as the introduction of legumes in pastures and the use of not-tillage systems can reverse this process. In this study, the effects of seven land-use systems (native savanna, forest, degraded pasture, improved pure-grass pastures, improved grass/legumes pastures, convencional cropping, and no-tillage cropping) on the SOM and potentially mineralizable nitrogen (Npot) were examined in whole-soil samples and particle-size separates. In addition, sugars and amino acids were determined for a better understanding of SOM dynamics, soil organic carbon (SOC), cellulosic and noncellulosic polysaccharides (CPs and NCPs, respectively), amino sugars, and Npot decreased under forest and increased under pastures. The positive influence of improved pasture systems, especially the grass/legume pasture, was clearly recognizable. Under the no-tillage systems, SOC and Npot levels increased, compared with conventional tillage. These differences were clearest in the sand fractions of the particle-size separates. The sugar dynamics refleted decomposition of plant tissue and subsequent accumulation of microbial sugars. The ration of glucosamine to muramic acid increased from coarse sand to fine sand and thereafter decreased toward clay. The cause ma... Mostrar Tudo |
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Palavras-Chave: |
Permanganato. |
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Thesagro: |
Carboidrato; Carbono; Cerrado; Composto Orgânico; Mineralização; Nitrogênio; Oxisol; Solo; Uso da Terra. |
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Thesaurus NAL: |
carbohydrates; carbon; Ferralsols; land use; mineralization; organic compounds; permanganates; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02948naa a2200409 a 4500
001 1545402
005 1999-07-15
008 1999 bl uuuu u00u1 u #d
100 1 $aFUHRMANN, S.
245 $aSoil organic carbon, carbohydrates, amino sugars, and potentially mineralizable nitrogen under different land-use systems in oxisols of the Brazilian cerrados.
260 $c1999
300 $ap.110-122.
520 $aIntensive farming and grazing on Oxisols of the Brazilian savannas (also known as the Cerrados) are leading to loss of soil organic matter (SOM) and consequently to a decline in fertility and sustainability of the soils. Alternative land-use systems such as the introduction of legumes in pastures and the use of not-tillage systems can reverse this process. In this study, the effects of seven land-use systems (native savanna, forest, degraded pasture, improved pure-grass pastures, improved grass/legumes pastures, convencional cropping, and no-tillage cropping) on the SOM and potentially mineralizable nitrogen (Npot) were examined in whole-soil samples and particle-size separates. In addition, sugars and amino acids were determined for a better understanding of SOM dynamics, soil organic carbon (SOC), cellulosic and noncellulosic polysaccharides (CPs and NCPs, respectively), amino sugars, and Npot decreased under forest and increased under pastures. The positive influence of improved pasture systems, especially the grass/legume pasture, was clearly recognizable. Under the no-tillage systems, SOC and Npot levels increased, compared with conventional tillage. These differences were clearest in the sand fractions of the particle-size separates. The sugar dynamics refleted decomposition of plant tissue and subsequent accumulation of microbial sugars. The ration of glucosamine to muramic acid increased from coarse sand to fine sand and thereafter decreased toward clay. The cause may be a stronger association of fungal hyphae with fine roots in the fine-sand fraction and an increased association of bacteria with the clay fraction. Amino sugars appeared to be an important source of Npot.
650 $acarbohydrates
650 $acarbon
650 $aFerralsols
650 $aland use
650 $amineralization
650 $aorganic compounds
650 $apermanganates
650 $asoil
650 $aCarboidrato
650 $aCarbono
650 $aCerrado
650 $aComposto Orgânico
650 $aMineralização
650 $aNitrogênio
650 $aOxisol
650 $aSolo
650 $aUso da Terra
653 $aPermanganato
700 1 $aNEUFELDT, H.
700 1 $aWESTERHOF, R.
700 1 $aAYARZA, M. A.
700 1 $aSILVA, J. E. da
700 1 $aZECH, W.
773 $tIn: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999.
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