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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
16/07/1999 |
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Data da última atualização: |
16/07/1999 |
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Autoria: |
WESTERHOF, R.; VILELA, L.; AYARZA, M. A.; ZECH, W. |
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Título: |
Characterizing labile and stable nitrogen. |
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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.141-146. |
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Idioma: |
Inglês |
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Conteúdo: |
The permanganate oxidation procedure is easily performed and may help monitor large areas for their soil organic matter (SOM) quality and nitrogen (N) availability. Knowledge of the chemical characteristics of fractions that are lost or remain after oxidation will help explain results obtained by this method. We found that amino acid N contributed 22.75% to the permanganate-extractable N fraction (PEN) and amino sugar N 9.1%, but the remaining 68.2% of the PEN was of "unknown" N. Stable N had lower amounts of amino acid N (15.5%) and amino sugar N (6.2%). Permanganate-extractable N and stable N may be spatially separated, that is, PEN is found outside microaggregates, whereas stable N is inside, where it is protected from permanganate extraction and probably also from microbial breakdown. Together with physically protected N, the stable N fraction also contained an important amount of chemically recalcitrant, not-extractable, "unknown" N with a chemical composition that is hypothesized to be different from that of the permanganate-extractable "unknown" N. |
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Thesagro: |
Cerrado; Mineralização; Nitrogênio; Oxisol; Uso da Terra. |
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Thesaurus Nal: |
Ferralsols; land use; mineralization; nitrogen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01881naa a2200277 a 4500
001 1545406
005 1999-07-16
008 1999 bl uuuu u00u1 u #d
100 1 $aWESTERHOF, R.
245 $aCharacterizing labile and stable nitrogen.
260 $c1999
300 $ap.141-146.
520 $aThe permanganate oxidation procedure is easily performed and may help monitor large areas for their soil organic matter (SOM) quality and nitrogen (N) availability. Knowledge of the chemical characteristics of fractions that are lost or remain after oxidation will help explain results obtained by this method. We found that amino acid N contributed 22.75% to the permanganate-extractable N fraction (PEN) and amino sugar N 9.1%, but the remaining 68.2% of the PEN was of "unknown" N. Stable N had lower amounts of amino acid N (15.5%) and amino sugar N (6.2%). Permanganate-extractable N and stable N may be spatially separated, that is, PEN is found outside microaggregates, whereas stable N is inside, where it is protected from permanganate extraction and probably also from microbial breakdown. Together with physically protected N, the stable N fraction also contained an important amount of chemically recalcitrant, not-extractable, "unknown" N with a chemical composition that is hypothesized to be different from that of the permanganate-extractable "unknown" N.
650 $aFerralsols
650 $aland use
650 $amineralization
650 $anitrogen
650 $aCerrado
650 $aMineralização
650 $aNitrogênio
650 $aOxisol
650 $aUso da Terra
700 1 $aVILELA, L.
700 1 $aAYARZA, M. A.
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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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 9 | |
| 5. |  | 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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| 6. | | WESTERHOF, R.; BUURMAN, P.; GRIETHUYSEN, C. van; AYARZA, M. A.; VILELA, L.; ZECH, W. Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime 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.64-76.| Biblioteca(s): Embrapa Cerrados. |
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| 8. | | 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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| 9. | | 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 : 9 | |
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