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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
30/06/1999 |
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Data da última atualização: |
30/06/1999 |
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Autoria: |
LOPES, A. S.; COX, F. R. |
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Título: |
Cerrado vegetation in Brazil: an edaphic gradient. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Agronomy Journal, Madison, v.69, n.5, p.828-831, 1977. |
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Idioma: |
Inglês |
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Conteúdo: |
The vegetation in central Brazil is a tropical savanna called "cerrado" that varies from pure grassland to a nearly closed of medium height trees overlying grass. Since forest is the expected climax vegetation there, several theories have been given to explain the types of grassland present. The more promising of these involve differences in soil properties, but only a few sites have been used for evaluation. To study these relaships in more detail and yet cover the bulk of the region, 518 composite topsoil samples were collected from a 600,000 km2 area. Laboratory characterizations included pH, exchangeable Al, nutrient levels (including micronutrients), organic matter content, particle size distribution, and color. The relationships between type of vegetation and differences in soil properties were evaluated statistically, primarily by correlation and regression. A positive gradient was found between the density and height of woody vegetation and the following soil properties: pH (H2O), pH (KCI), exchangeable Ca, Mg, and K, and extractable P, Zn, Cu, and Mn. As the percent of Al saturation increased there was a decrease in density and height of woody vegetation. Neither exchangeable Al, particle size distribution, nor organic matter content showed a consistent gradient with the vegetable measure. There was a tendency for more dense stands of vegetation to occur on dark, reddish brown topsoils while less dense stands occurred on brown topsoils. The results suggest that the types of vegetation present in the region may best be explained by differences in soil properties, and it is recommended that soil Al be expressed by percentage Al saturation, rather than by is absolute value, in these relationships. Menos The vegetation in central Brazil is a tropical savanna called "cerrado" that varies from pure grassland to a nearly closed of medium height trees overlying grass. Since forest is the expected climax vegetation there, several theories have been given to explain the types of grassland present. The more promising of these involve differences in soil properties, but only a few sites have been used for evaluation. To study these relaships in more detail and yet cover the bulk of the region, 518 composite topsoil samples were collected from a 600,000 km2 area. Laboratory characterizations included pH, exchangeable Al, nutrient levels (including micronutrients), organic matter content, particle size distribution, and color. The relationships between type of vegetation and differences in soil properties were evaluated statistically, primarily by correlation and regression. A positive gradient was found between the density and height of woody vegetation and the following soil properties: pH (H2O), pH (KCI), exchangeable Ca, Mg, and K, and extractable P, Zn, Cu, and Mn. As the percent of Al saturation increased there was a decrease in density and height of woody vegetation. Neither exchangeable Al, particle size distribution, nor organic matter content showed a consistent gradient with the vegetable measure. There was a tendency for more dense stands of vegetation to occur on dark, reddish brown topsoils while less dense stands occurred on brown topsoils. The results suggest t... Mostrar Tudo |
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Palavras-Chave: |
Propriedade fisico-quimica do solo; Soil chemicophysical properties. |
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Thesagro: |
Cerrado; Oxisol; Vegetação. |
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Thesaurus Nal: |
Ferralsols; vegetation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02322naa a2200217 a 4500
001 1545367
005 1999-06-30
008 1977 bl --- 0-- u #d
100 1 $aLOPES, A. S.
245 $aCerrado vegetation in Brazil$ban edaphic gradient.
260 $c1977
520 $aThe vegetation in central Brazil is a tropical savanna called "cerrado" that varies from pure grassland to a nearly closed of medium height trees overlying grass. Since forest is the expected climax vegetation there, several theories have been given to explain the types of grassland present. The more promising of these involve differences in soil properties, but only a few sites have been used for evaluation. To study these relaships in more detail and yet cover the bulk of the region, 518 composite topsoil samples were collected from a 600,000 km2 area. Laboratory characterizations included pH, exchangeable Al, nutrient levels (including micronutrients), organic matter content, particle size distribution, and color. The relationships between type of vegetation and differences in soil properties were evaluated statistically, primarily by correlation and regression. A positive gradient was found between the density and height of woody vegetation and the following soil properties: pH (H2O), pH (KCI), exchangeable Ca, Mg, and K, and extractable P, Zn, Cu, and Mn. As the percent of Al saturation increased there was a decrease in density and height of woody vegetation. Neither exchangeable Al, particle size distribution, nor organic matter content showed a consistent gradient with the vegetable measure. There was a tendency for more dense stands of vegetation to occur on dark, reddish brown topsoils while less dense stands occurred on brown topsoils. The results suggest that the types of vegetation present in the region may best be explained by differences in soil properties, and it is recommended that soil Al be expressed by percentage Al saturation, rather than by is absolute value, in these relationships.
650 $aFerralsols
650 $avegetation
650 $aCerrado
650 $aOxisol
650 $aVegetação
653 $aPropriedade fisico-quimica do solo
653 $aSoil chemicophysical properties
700 1 $aCOX, F. R.
773 $tAgronomy Journal, Madison$gv.69, n.5, p.828-831, 1977.
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Registro original: |
Embrapa Cerrados (CPAC) |
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| Registros recuperados : 4 | |
| 1. |  | BORKERT, C. M.; COX, F. R. Effects of acidity at high soil zinc, copper, and manganese on peanut, rice, and soybean. Communication in Soil Science and Plant Analysis; New York, v.30, n.9/10, p.1371-1384, 1999.| Biblioteca(s): Embrapa Soja. |
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| 3. | | RITCHEY, K. D.; COX, F. R.; GALRAO, E. Z.; YOST, R. S. Disponibilidade de zinco para as culturas do milho, sorgo e soja em Latossolo Vermelho-Escuro argiloso. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.3, p.215-225, mar. 1986.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 4. | | RITCHEY, K. D.; COX, F. R.; GALRAO, E. Z.; YOST, R. S. Disponibilidade de zinco para as culturas do milho, sorgo e soja em latossolo vermelho-escuro argiloso. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.3, p.215-225, 1986.| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 4 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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