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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
03/05/2001 |
Data da última atualização: |
03/05/2001 |
Autoria: |
NEUFELDT, H.; SILVA, J. E. da; AYARZA, M. A.; ZECH, W. |
Título: |
Land-use effects on phosphorus fractions in Cerrado oxisols. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Biology and Fertility of Soils, Heidelberger, v.31, p.30-37, 2000. |
Idioma: |
Inglês |
Conteúdo: |
Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. |
Thesagro: |
Cerrado; Fósforo; Fracionamento; Oxisol; Uso da Terra. |
Thesaurus Nal: |
Ferralsols; fractionation; land use; phosphorus. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02166naa a2200265 a 4500 001 1546797 005 2001-05-03 008 2000 bl --- 0-- u #d 100 1 $aNEUFELDT, H. 245 $aLand-use effects on phosphorus fractions in Cerrado oxisols. 260 $c2000 520 $aDifferently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only incresead levels of inorganic P (Pi) forms, the increase being mot acentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particlesize fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69-87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also na effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. 650 $aFerralsols 650 $afractionation 650 $aland use 650 $aphosphorus 650 $aCerrado 650 $aFósforo 650 $aFracionamento 650 $aOxisol 650 $aUso da Terra 700 1 $aSILVA, J. E. da 700 1 $aAYARZA, M. A. 700 1 $aZECH, W. 773 $tBiology and Fertility of Soils, Heidelberger$gv.31, p.30-37, 2000.
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Registros recuperados : 12 | |
5. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | 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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9. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | 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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11. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | 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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12. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | 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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Registros recuperados : 12 | |
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