The micromorphology of soils

Fitzpatrick, E. A.

doi:10.1007/978-94-009-5544-8_13

Cited by 68 publications

(64 citation statements)

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“…Thin sections 4.5×6 cm 2 were produced and polished with diamond grains of decreasing size (FitzPatrick, 1984). They were coated with carbon prior examination in scanning electron microscopy using the backscattered electron mode.…”

Section: Sampling and Methodsmentioning

confidence: 99%

Change in the hydraulic properties of a Brazilian clay Ferralsol on clearing for pasture

Balbino¹,

Bruand²,

Cousin³

et al. 2004

Geoderma

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Ferralsols under native vegetation have a weak to moderate macrostructure and a welldeveloped microstructure corresponding to subrounded microaggregates that are usually 80 to 300 μm in size. The aim of this study was to analyze how the hydraulic properties of a clay Ferralsol were affected by a change of structure when the native vegetation is cleared for pasture. We studied the macrostructure in the field and microstructure in scanning electron microscopy. The water retention properties were determined by using pressure cell equipment. We determined the saturated hydraulic conductivity, K s , by applying a constant hydraulic head to saturated core samples, and the unsaturated hydraulic conductivity, K(Ψ), by applying the evaporation method to undisturbed core samples. Results showed a significant decrease in the water retained at −1 and −10 hPa from 0-to 40-cm-depth when the native vegetation is cleared for pasture. That decrease in the water retained was related to a smaller development of microaggregation and greater proportion of microaggregates in close packing. For smaller water potential, there was no difference of water retained at every depth between native vegetation and pasture. Pedotransfer functions established earlier for Brazilian Ferralsols and using clay content as single predictor gave pretty good results but the precision of the estimation decreased when the water potential increased. This decrease in the precision was related to the lack of predictor taking structure into account. K s and K(Ψ) showed an upward trend with depth under native vegetation and pasture. Except at 0-7-cm depth between the Brachiaria clumps in the pasture where smaller K s and K(Ψ) than at the other depth was recorded whatever land use, we did not record any significant difference of K s and K(Ψ) at every depth between native vegetation and pasture. The upward trend shown by the hydraulic conductivity with depth was related to the increase in the development of microaggregation with depth.

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Section: Sampling and Methodsmentioning

confidence: 99%

Change in the hydraulic properties of a Brazilian clay Ferralsol on clearing for pasture

Balbino¹,

Bruand²,

Cousin³

et al. 2004

Geoderma

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“…As análises micromorfológicas foram realizadas em lâminas delgadas de 3,5 x 7,0 cm, confeccionadas a vácuo, com resina de poliéster (Fitzpatrick, 1984), a partir de amostras indeformadas, e observadas em microscópio de luz plana, com polarização, luz refletida e transmitida da ZEISS, modelo AXIOPLAN. As análises seguiram critérios estabelecidos em Brewer (1976), Bullock et al (1985) e Lima et al (1985).…”

Section: Análises De Solosunclassified

Mineralogia, morfologia e análise microscópica de solos do bioma cerrado

Gomes

Curi

Schulze

et al. 2004

Rev. Bras. Ciênc. Solo

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RESUMOAs características macro e micromorfológicas dos horizontes diagnósticos superficiais e subsuperficiais de Latossolos e Neossolos Quartzarênicos das superfícies Sul-Americana e Velhas foram estudadas em perfis sob cobertura de vegetação nativa, visando estabelecer um referencial para futuras comparações com áreas similares sob constante intervenção antrópica em termos de sustentabilidade. Com os solos referenciados por sub-região e pela superfície geomórfica que representam, três agrupamentos foram constituídos: Grupo 1: solos de textura argilosa a muito argilosa e hipo a mesoférricos; Grupo 2: solos de textura média a arenosa e hipoférricos, e Grupo 3: solos de textura argilosa a muito argilosa e férricos. O horizonte Bw dos Latossolos argilosos e muito argilosos estudados (Grupos 1 e 3), com relações cauliníticas/(caulinita + gibbsita) variando de 0,27 a 0,77, apresentaram grande coincidência de estrutura e microestrutura, respectivamente, forte muito pequena granular e de microagregados. Os solos do Grupo 2, Latossolos de textura média e um Neossolo

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“…Briefly, once organic features were classified according to their form following the 12 recommendation of Babel (1975), the extent of their decomposition was identified using the 13 classification proposed by FitzPatrick (1984). Dark organic features and other dark 14 components, typically rich in Fe or Mn oxides, were distinguished by the elemental 15 composition obtained using the SEM-EDS.…”

Section: Soil Samplesmentioning

confidence: 99%

“…By exporting images 20 into an image manipulation program (GIMP 2.6) each organic feature was represented by 21 differently coloured pixels and stacked upon the binary pore image thereby forming a map 22 showing the distribution of organic matter in relation to soil pores (electronic supplement 1a-23 b). 24 …”

Section: Soil Samplesmentioning

confidence: 99%