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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
16/02/2000 |
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Data da última atualização: |
16/02/2000 |
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Autoria: |
NEUFELDT, H.; AYARZA, M. A.; RESCK, D. V. S.; ZECH, W. |
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Título: |
Distribution of water-stable aggregates and aggregating agents in Cerrado Oxisols. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v.93, p.85-99, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
The effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while micro-porosity was unaffected from management and only differed between the two substrates. Considering the low pore space at plant-available matrix potentials typical of Cerrado Oxisols, the increase might be important for annual crops during the frequent dry spells in the rainy season. MenosThe effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while m... Mostrar Tudo |
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Thesagro: |
Cerrado; Estrutura do Solo; Uso da Terra. |
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Thesaurus Nal: |
Ferralsols; land use; soil structure. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02389naa a2200229 a 4500
001 1555056
005 2000-02-16
008 1999 bl --- 0-- u #d
100 1 $aNEUFELDT, H.
245 $aDistribution of water-stable aggregates and aggregating agents in Cerrado Oxisols.
260 $c1999
520 $aThe effects of structural changes on Cerrado Oxisols in Brazil after land-use change are still insufficiently studied. Therefore, topsoil samples of loamy and clayey Cerrado Oxisols under crop pasture and reforestation were fractionated using a wet-sieving procedure to obtain the distribution of water-stable aggregates and compared to samples from natural savanna. The results were correlated to organic and inorganic soil compounds to identify the main aggregating agents and discussed in relation to changes in the pore-size distribution of the soils. Clayey soils showed a significantly higher macro-aggregation than loamy soils. Compared to natural savanna, macro-aggregation was clearly reduced at the crop sites, whereas aggregation of soils under pasture and reforestation was only slightly affected. In both the clayey and the loamy soils, bonding of polysaccharides was the main aggregating agent. In the clayey soils, liming was also very important for disaggregation by weakening the electrostatic forces between positively and negativeley charged soil compounds, whereas in the loamy soils, binding of macro-aggregates by roots was significant. The introduction of crop-pasture rotations was therefore proposed to take advantage of the strong rooting and polysaccharide production of pastures. Management-induced disaggregation strongly affected the pore-size distribution by compacting the soils. Thereby, macro-porosity was reduced and the ampunt of meso-pores was increased, while micro-porosity was unaffected from management and only differed between the two substrates. Considering the low pore space at plant-available matrix potentials typical of Cerrado Oxisols, the increase might be important for annual crops during the frequent dry spells in the rainy season.
650 $aFerralsols
650 $aland use
650 $asoil structure
650 $aCerrado
650 $aEstrutura do Solo
650 $aUso da Terra
700 1 $aAYARZA, M. A.
700 1 $aRESCK, D. V. S.
700 1 $aZECH, W.
773 $tGeoderma, Amsterdam$gv.93, p.85-99, 1999.
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 50 | |
| 22. |  | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; LIMA, S. do C.; VILELA, L.; ZECH, W. Annual course of matric potential in differently used savanna oxisols in Brazil. Soil Society of American Journal, Madison, v.63, p.1778-1785, 1999.| Biblioteca(s): Embrapa Cerrados. |
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| 23. | | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECH, W. Chemical fractionation of phosphorus, sulphur, and molybdenum in Brazilian savannah oxisols under different land use. Geoderma, Amsterdam, v. 96, p. 31-46, 2000.| Biblioteca(s): Embrapa Cerrados. |
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| 24. | | SMITH, J.; CADAVID, J. V.; AYARZA, M.; AGUIAR, J. L. P. de; ROSA, R. Land use change in soybean production systems in the Brazilian savanna: the role of policy and market conditions. Journal of Sustainable Agriculture, Binghamton, v.15, n.2/3, p.95-117, 1999.| Biblioteca(s): Embrapa Cerrados. |
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| 25. | | LILIENFEIN, J.; WILCKE, W.; NEUFELDT, M.; AYARZA, M. A.; ZECH, W. Land-use effects on organic carbon, nitrogen, and sulphur concentrations in macroaggregates of differently textured Brazilian oxisols. Journal of Plant Nutrition and Soil Science, Berlin, v.161, n.2, p.165-171, 1998.| Biblioteca(s): Embrapa Cerrados. |
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| 28. | | AYARZA, M. A.; VILELA, L.; BARCELLOS, A. de O.; BALBINO, L. C.; BROSSARD, M.; PASINI, A. Integration culture-elevage dans les cerrados au Brasil: une solution pour des systemes durables. Agriculture et Developpement, Montpellier, n.18, p.91-98, juin 1998.| Biblioteca(s): Embrapa Cerrados. |
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| 29. | | AYARZA, M. A.; VILELA, L.; BARCELLOS, A. de O.; BALBINO, L. C.; BROSSARD, M.; PASINI, A. Integration culture-elevage dans les cerrados au Bresil: une solution pour des systemes durables. Agriculture et Developpement, Montpellier, n. 18, p. 91-98, juin 1998.| Tipo: Artigo em Periódico Indexado |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 30. | | ARAUJO, A. G. de; AYARZA, M. A.; FRIESEN, D. K.; VILELA, L. Fracoes organicas e inorganicas de fosforo em um solo de cerrado sob diferentes sistemas de manejo. 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.319-322.| Biblioteca(s): Embrapa Cerrados. |
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| 32. | | AYARZA, M. A.; VILELA, L.; PIZARRO, E. A.; COSTA, P. H. da. Sistemas agropastoriles basados en leguminosas de usos multiples. In: GUIMARAES, E.P.; SANZ, J.I.; RAO, I.M.; AMEZQUITA, M.C.; AMEZQUITA, E., ed. Sistemas agropastoriles en sabanas tropicales de America Latina. Cali: CIAT/Brasilia: Embrapa, 1999. p.175-193.| Biblioteca(s): Embrapa Cerrados. |
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| 35. | | PIZARRO, E. A.; AYARZA, M. A.; SPAIN, J. M.; CARVALHO, M. A.; SOUZA, M. A. de. Efecto de la irrigacion en la produccion de semillas de Stylosanthes guianensis cv. Mineirao. Pasturas Tropicales, Cali, v.15, n.3, p.27-28, 1993.| Biblioteca(s): Embrapa Cerrados. |
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| 36. | | 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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| 38. | | LILIENFEIN, J.; WILCKE, W.; AYARZA, M. A.; VILELA, L.; LIMA, S. do C.; ZECK, W. Soil acidification in Pinus caribaea forests on Brazilian savanna oxisols. Forest Ecology and Management, Amsterdam, v. 128, p. 145-157, 2000.| Biblioteca(s): Embrapa Cerrados. |
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| 40. | | 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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| Registros recuperados : 50 | |
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