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21. | | 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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24. | | RAMOS, A. K. B.; PIZARRO, E. A.; AYARZA, M. A.; CARVALHO, M. A.; COSTA, P. H. Avaliacao agronomica de gramineas forrageiras consorciadas com Stylosanthes guianensis Cv. Mineirao em Uberlandia - MG. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33., 1996, Fortaleza, CE. Anais... Fortaleza: SBZ, 1996. v.2. p.206-208. Biblioteca(s): Embrapa Cerrados. |
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25. | | PIZARRO, E. A.; RAMOS, A. K. B.; AYARZA, M. A.; CARVALHO, M. A.; COSTA, P. H. Avaliacao agronomica de leguminosas forrageiras consorciadas com B. decumbens em Uberlandia - MG. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33., 1996, Fortaleza, CE. Anais... Fortaleza: SBZ, 1996. v.2. p.209-211. Biblioteca(s): Embrapa Cerrados. |
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26. | | 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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27. | | 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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28. | | 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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29. | | THOMAS, R. J.; FISHER, M.; LASCANO, C.; RAO, I. M.; AYARZA, M.; ASAKAWA, N. Nutrient cycling via forage litter in tropical grass-legume pastures. In: Proceedings of the XVII International Grassland Congress, New Zealand., v., p.508-509, 1994. Biblioteca(s): Embrapa Agrobiologia. |
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32. | | 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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34. | | 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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35. | | ARAÚJO, A. G. de; AYARZA, M. A.; FRIESEN, D. K.; VILELA, L. Frações orgânicas e inorgânicas de fósforo em um solo de cerrado sob diferentes sistemas de manejo. In: SIMPÓSIO SOBRE O CERRADO, 8.; INTERNATIONAL SYMPOSIUM ON TROPICAL SAVANNAS, 1., 1996, Brasília, DF. Biodiversidade e produção sustentável de alimentos e fibras nos cerrados: anais. Planaltina, DF: EMBRAPA-CPAC, 1996. p. 319-322. Biblioteca(s): Embrapa Meio Norte / UEP-Parnaíba. |
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36. | | 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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37. | | 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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39. | | 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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Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
30/03/1999 |
Data da última atualização: |
30/03/1999 |
Autoria: |
LILIENFEIN, J.; WILCKE, W.; NEUFELDT, M.; AYARZA, M. A.; ZECH, W. |
Título: |
Land-use effects on organic carbon, nitrogen, and sulphur concentrations in macroaggregates of differently textured Brazilian oxisols. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
Journal of Plant Nutrition and Soil Science, Berlin, v.161, n.2, p.165-171, 1998. |
Idioma: |
Inglês |
Conteúdo: |
The objective of this study was to assess the influence of land use on soil aggregate size distribution and the consequences for organic C,N, and S concentrations in bulk soil and macroaggregates. The properties of a loamy and a clayey Oxisol used for continuos cropping, pasture and reforestation were compared with those of the native savannah ("Cerrado"). We measured aggregate size fractionation, C,N, and S concentrations in bulk soil, small (0,25-2mm, SMA), and large macroaggregates (2-8mm, LMA), and carried out a mineralization experiment with intact and crushed LMA. The aggregate size distribution of pastures was not different from native Cerrado. Reforestation and plowing caused higher percentages of smaller aggregates which was more pronounced in the loamy than in the clayey soil. Total concentrations of C,N, and S were higher in the clayey (C: 21.5-23.3 g kg; N:1.2-1.4 g kg; S: 178-213 mg kg) than in the loamy soil (C: 7.8-10.3 g kg; N 0.5-0.7 g kg; S: 87-132 mg kg). LMA of the loamy soil had higher C,N and S concentrations than the bulk soil. SMA and both macroaggregate fractions of the clayey soil did differ from the bulk soil. 71% of potentially mineralizable N in LMA of the loamy soil were only mineralized after aggregate disruption. In contrast, there were only small differences between crushed and intact LMA of the clayey soil. The loamy soil would require a more soil conserving system like no-till or crop-pasture rotation to improve sustainability. |
Palavras-Chave: |
Brasil; Sulphur. |
Thesagro: |
Carbono; Cerrado; Enxofre; Estrutura do Solo; Nitrogênio; Uso da Terra. |
Thesaurus NAL: |
Brazil; carbon; land use; nitrogen; soil structure. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02374naa a2200325 a 4500 001 1554782 005 1999-03-30 008 1998 bl --- 0-- u #d 100 1 $aLILIENFEIN, J. 245 $aLand-use effects on organic carbon, nitrogen, and sulphur concentrations in macroaggregates of differently textured Brazilian oxisols. 260 $c1998 520 $aThe objective of this study was to assess the influence of land use on soil aggregate size distribution and the consequences for organic C,N, and S concentrations in bulk soil and macroaggregates. The properties of a loamy and a clayey Oxisol used for continuos cropping, pasture and reforestation were compared with those of the native savannah ("Cerrado"). We measured aggregate size fractionation, C,N, and S concentrations in bulk soil, small (0,25-2mm, SMA), and large macroaggregates (2-8mm, LMA), and carried out a mineralization experiment with intact and crushed LMA. The aggregate size distribution of pastures was not different from native Cerrado. Reforestation and plowing caused higher percentages of smaller aggregates which was more pronounced in the loamy than in the clayey soil. Total concentrations of C,N, and S were higher in the clayey (C: 21.5-23.3 g kg; N:1.2-1.4 g kg; S: 178-213 mg kg) than in the loamy soil (C: 7.8-10.3 g kg; N 0.5-0.7 g kg; S: 87-132 mg kg). LMA of the loamy soil had higher C,N and S concentrations than the bulk soil. SMA and both macroaggregate fractions of the clayey soil did differ from the bulk soil. 71% of potentially mineralizable N in LMA of the loamy soil were only mineralized after aggregate disruption. In contrast, there were only small differences between crushed and intact LMA of the clayey soil. The loamy soil would require a more soil conserving system like no-till or crop-pasture rotation to improve sustainability. 650 $aBrazil 650 $acarbon 650 $aland use 650 $anitrogen 650 $asoil structure 650 $aCarbono 650 $aCerrado 650 $aEnxofre 650 $aEstrutura do Solo 650 $aNitrogênio 650 $aUso da Terra 653 $aBrasil 653 $aSulphur 700 1 $aWILCKE, W. 700 1 $aNEUFELDT, M. 700 1 $aAYARZA, M. A. 700 1 $aZECH, W. 773 $tJournal of Plant Nutrition and Soil Science, Berlin$gv.161, n.2, p.165-171, 1998.
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