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Registro Completo |
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Biblioteca(s): |
Embrapa Territorial. |
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Data corrente: |
19/02/2015 |
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Data da última atualização: |
19/02/2015 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
VALLADARES, G. S.; GREGO, C. R.; BATISTELLA, M. |
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Afiliação: |
GUSTAVO SOUZA VALLADARES, CNPM; CELIA REGINA GREGO, CNPM; MATEUS BATISTELLA, CNPM. |
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Título: |
Spatial variability of soil physical attributes in Machadinho d Oeste (Ro), Amazon Basin. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
In: GLOBAL WORKSHOP ON DIGITAL SOIL MAPPING, 2., 2006, Rio de Janeiro. Anais... Rio de Janeiro: Embrapa Solos, 2006. |
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Páginas: |
6 p. |
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Idioma: |
Português |
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Conteúdo: |
The aim of this paper was to understand the spatial variability of soil physical attributes within the superficial layer (0-10 cm) in an area of agricultural colonization in Machadinho d?Oeste (RO). The attributes analyzed were real density, clay, silt, coarse sand, and fine sand contents. In September, 2004, 76 samples were collected through an irregular sampling strategy, based on soil and topographic features. Oxisols and Ultisols are the predominant soil types in the area. The clay content ranged from 2 to 67%, silt from 2 to 63%, coarse sand from 4 to 78%, fine sand from 6 to 45%, and real density from 2.08 to 2.60 (g cm-3). Some of the high contents of silt can be due to resistant aggregates of the clay fraction, as the adopted methodology did not separate clay grains. The majority of attributes presented coefficients of variation higher than 40%, except for real density. Real density is highly correlated with the coarse sand fraction (r = 0,94) and with the sum of the clay and silt fractions (r = -0,86). Geostatistics was used to understand the spatial variability of such attributes, through the analysis of semivariograms, kriging, and isoline maps. Despite statistical distances among the samples, the spatial dependence ratio (RD) was classified as moderate and strong. The spherical model had good adjustment for the studied attributes. Similarities were found for the spatial behavior of some attributes, such as clay, coarse sand, and real density. The lowest range values were for clay, silt, and coarse sand (i.e., around 10,000 m). For fine sand and real density, the range was between 15,000 and 16,000 m. Kriging techniques were suitable to depict the space distribution of the studied attributes. Soils with clay contents higher than 30% are predominant in the area, followed by soils with loam texture. MenosThe aim of this paper was to understand the spatial variability of soil physical attributes within the superficial layer (0-10 cm) in an area of agricultural colonization in Machadinho d?Oeste (RO). The attributes analyzed were real density, clay, silt, coarse sand, and fine sand contents. In September, 2004, 76 samples were collected through an irregular sampling strategy, based on soil and topographic features. Oxisols and Ultisols are the predominant soil types in the area. The clay content ranged from 2 to 67%, silt from 2 to 63%, coarse sand from 4 to 78%, fine sand from 6 to 45%, and real density from 2.08 to 2.60 (g cm-3). Some of the high contents of silt can be due to resistant aggregates of the clay fraction, as the adopted methodology did not separate clay grains. The majority of attributes presented coefficients of variation higher than 40%, except for real density. Real density is highly correlated with the coarse sand fraction (r = 0,94) and with the sum of the clay and silt fractions (r = -0,86). Geostatistics was used to understand the spatial variability of such attributes, through the analysis of semivariograms, kriging, and isoline maps. Despite statistical distances among the samples, the spatial dependence ratio (RD) was classified as moderate and strong. The spherical model had good adjustment for the studied attributes. Similarities were found for the spatial behavior of some attributes, such as clay, coarse sand, and real density. The lowest range val... Mostrar Tudo |
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Palavras-Chave: |
Soil physical attributes. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/118137/1/4390.pdf
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Marc: |
LEADER 02395nam a2200157 a 4500
001 2009003
005 2015-02-19
008 2006 bl uuuu u00u1 u #d
100 1 $aVALLADARES, G. S.
245 $aSpatial variability of soil physical attributes in Machadinho d Oeste (Ro), Amazon Basin.$h[electronic resource]
260 $aIn: GLOBAL WORKSHOP ON DIGITAL SOIL MAPPING, 2., 2006, Rio de Janeiro. Anais... Rio de Janeiro: Embrapa Solos$c2006
300 $a6 p.
520 $aThe aim of this paper was to understand the spatial variability of soil physical attributes within the superficial layer (0-10 cm) in an area of agricultural colonization in Machadinho d?Oeste (RO). The attributes analyzed were real density, clay, silt, coarse sand, and fine sand contents. In September, 2004, 76 samples were collected through an irregular sampling strategy, based on soil and topographic features. Oxisols and Ultisols are the predominant soil types in the area. The clay content ranged from 2 to 67%, silt from 2 to 63%, coarse sand from 4 to 78%, fine sand from 6 to 45%, and real density from 2.08 to 2.60 (g cm-3). Some of the high contents of silt can be due to resistant aggregates of the clay fraction, as the adopted methodology did not separate clay grains. The majority of attributes presented coefficients of variation higher than 40%, except for real density. Real density is highly correlated with the coarse sand fraction (r = 0,94) and with the sum of the clay and silt fractions (r = -0,86). Geostatistics was used to understand the spatial variability of such attributes, through the analysis of semivariograms, kriging, and isoline maps. Despite statistical distances among the samples, the spatial dependence ratio (RD) was classified as moderate and strong. The spherical model had good adjustment for the studied attributes. Similarities were found for the spatial behavior of some attributes, such as clay, coarse sand, and real density. The lowest range values were for clay, silt, and coarse sand (i.e., around 10,000 m). For fine sand and real density, the range was between 15,000 and 16,000 m. Kriging techniques were suitable to depict the space distribution of the studied attributes. Soils with clay contents higher than 30% are predominant in the area, followed by soils with loam texture.
653 $aSoil physical attributes
700 1 $aGREGO, C. R.
700 1 $aBATISTELLA, M.
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