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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: |
FREIBAUER, A.; WESTERHOF, R.; AYARZA, M. A.; SILVA, J. E. da; ZECH, W. |
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Título: |
Short-term variation in aggregation and particulate organic matter under crop pastures. |
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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.77-88. |
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Idioma: |
Inglês |
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Conteúdo: |
Short-term changes in soil aggregation, total and particulate organic C and N were studied in cropping and pasture systems of the Brazilian savannas, also known as the Cerrados. Furthermore, the concepts of a hierarchical aggregate structure and of the interaction of soil structure with particulate organic matter (POM) available for temperate soils were evaluated and modified for tropical Oxisols. The results showed that Oxisol peds (>2 mm) were sensitive to land use and subject to significant seasonal turnover, indicating a similar behavior as in temperate soils. Three POM fractions were distinguished: (1) free POM situated in the free soil pore space, (2) easily accessible POM, loosely bound in peds and introduced in this study, and (3) occluded POM which was not studied. Free and easily accessible POMs were important active C pools and increased with human activity. The ratio of free to easily accessible POMs could clearly characterize the different land-use systems. |
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Thesagro: |
Carbono; Cerrado; Estrutura do Solo; Glycine Max; Matéria Orgânica; Nitrogênio; Pastagem; Soja. |
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Thesaurus Nal: |
carbon; nitrogen; organic matter; pastures; soil structure; soybeans. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02009naa a2200349 a 4500
001 1545400
005 1999-07-15
008 1999 bl uuuu u00u1 u #d
100 1 $aFREIBAUER, A.
245 $aShort-term variation in aggregation and particulate organic matter under crop pastures.
260 $c1999
300 $ap.77-88.
520 $aShort-term changes in soil aggregation, total and particulate organic C and N were studied in cropping and pasture systems of the Brazilian savannas, also known as the Cerrados. Furthermore, the concepts of a hierarchical aggregate structure and of the interaction of soil structure with particulate organic matter (POM) available for temperate soils were evaluated and modified for tropical Oxisols. The results showed that Oxisol peds (>2 mm) were sensitive to land use and subject to significant seasonal turnover, indicating a similar behavior as in temperate soils. Three POM fractions were distinguished: (1) free POM situated in the free soil pore space, (2) easily accessible POM, loosely bound in peds and introduced in this study, and (3) occluded POM which was not studied. Free and easily accessible POMs were important active C pools and increased with human activity. The ratio of free to easily accessible POMs could clearly characterize the different land-use systems.
650 $acarbon
650 $anitrogen
650 $aorganic matter
650 $apastures
650 $asoil structure
650 $asoybeans
650 $aCarbono
650 $aCerrado
650 $aEstrutura do Solo
650 $aGlycine Max
650 $aMatéria Orgânica
650 $aNitrogênio
650 $aPastagem
650 $aSoja
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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Embrapa Cerrados (CPAC) |
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