Clay mineralogy and magnetic susceptibility of Oxisols in geomorphic surfaces

Camargo, Lívia Arantes; Júnior, José Marques; Pereira, Gener Tadeu; Bahia, Angélica Santos Rabelo de Souza

doi:10.1590/s0103-90162014000300010

Cited by 55 publications

(43 citation statements)

References 32 publications

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“…The asymptotic sill of the exponential model is responsible for mild transitions in space, which are typical of attributes changing abruptly in the field. Camargo et al (2014) applied spherical, exponential and gaussian models to a soil of the same type. Additionally, La Scala et al (2000), Brito et al (2010) and Panosso et al (2009) have used spherical models to fit CO 2 emission semivariograms on the same soil type and crop.…”

Section: Resultsmentioning

confidence: 99%

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Bahia

Júnior

Panosso

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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ABSTRACT:Soil CO 2 emission (FCO 2 ) is one of the main sources of carbon release into the atmosphere. Moreover, FCO 2 is related to soil attributes governing the transfer of gases from soil to the atmosphere. This study aimed firstly to describe the spatial variability of hematite (Hm), goethite (Gt), iron extracted with sodium dithionite-citrate-bicarbonate (Fe d ) contents, soil CO 2 emission (FCO 2 ) and free-water porosity (FWP) and secondly, to develop statistical models to predict the above mentioned factors in an Oxisol cultivated under manual harvesting of sugarcane (Saccharum spp.) in southeastern Brazil. The study was conducted on an irregular 50 m × 50 m grid containing 89 points, each 0.5-10 m apart. The 0-0.1 m soil layer at each sampling point was used to assess soil FCO 2 , moisture and total pore volume. The results were subjected to descriptive statistical and geostatistical analyses using auto-and cross-semivariograms. All soil attributes exhibited a spatial dependence structure and the experimental semivariograms fitted spherical and exponential models. The Gt content was the individual attribute that exhibited the highest linear and spatial correlation, especially with FCO 2 . We were able to use diffuse reflectance spectroscopy to map large areas, which allows for easy identification and estimation of soil attributes such as FCO 2 and FWP. Geostatistical techniques faciltate the interpretation of spatial relationships between soil respiration and the examined properties.

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Section: Resultsmentioning

confidence: 99%

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Bahia

Júnior

Panosso

et al. 2015

Sci. agric. (Piracicaba, Braz.)

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“…The Fe s content showed significant correlation (R 2 > 0.58, p < 0.01, n = 14) with χ LF values (Figures 6A, B and C), highlighting participation of parent material in the expression of soil magnetic properties (Lu, 2000;Lu, 2003;Hanesch et al, 2007;Silva et al, 2010;Camargo et al, 2014;Cervi et al, 2014;Carvalho Filho et al, 2015). However, soils with low Fe s content present low magnetic susceptibility, regardless of the color (Silva et al, 2010).…”

Section: ------------------------------------------10 -8 M 3 Kg -1 --mentioning

confidence: 88%

“…In addition to the lithological influence (Lu, 2000;Lu, 2003;Hanesch et al, 2007;Silva et al, 2010;Camargo et al, 2014;Cervi et al, 2014), pedogenesis (Hanesch et al, 2007;Lu et al, 2008) and wetter pedoenvironmental conditions (Curi and Franzmeier, 1984) might also have contributed to the difference in proportions of ferrimagnetic minerals.…”

Section: Mass Specific Magnetic Susceptibilitymentioning

confidence: 99%

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Camêlo

Ker

Fontes

et al. 2018

Sci. agric. (Piracicaba, Braz.)

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Fe-rich Oxisols on mafic rocks in Brazil generally have high magnetic susceptibility with high contents of some trace elements. These are taxonomically similar soils; however, differences in magnetic and geochemical properties may affect agricultural or environmental usability and subsequent management. This study investigated the pedogenesis of Fe-rich Oxisols from various parent materials and evaluated the lithogenetic influence on magnetic susceptibility and trace elements contents. Soil samples were collected from Bw horizons in 13 Rhodic Oxisols and a Typic Oxisol developed from several parent materials in Minas Gerais State, Brazil. Soils were analyzed by X-ray diffractometry (XRD) and magnetometry. Soil chemical analyses consisted of sulfuric and total (tri-acid) digestions and selective Fe oxides dissolutions and statistical correlations were determined. Fe-rich Oxisols presented a typical mineralogical composition of highly weathered soils with structural stability. The results confirm the difficulty to identify accurately magnetic minerals in different grain sizes using XRD. However, coarse fractions still exert dominant influence on the magnetic properties of the Fe-rich Rhodic Oxisols. In addition, coarse fractions probably contribute to the enrichment of superparamagnetic particles for the clay fraction. Although highly weathered, Fe-rich Oxisols may have their geochemical attributes still controlled by the parent material, where trace elements seem to be correlated with the magnetic minerals in the coarse fractions. Thus, the natural replacement of some trace elements from soil-solution equilibrium reactions during plant development could be more effective in soils with higher magnetic particles concentrations in the coarse fractions.

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“…According to Matias et al (2013) and Camargo et al (2014), MS was efficient to define different pedogenetic environments in apparently homogeneous areas in southeastern Brazil. Magnetic susceptibility was also effective in landscape compartmentalization and identification of different pedogenic environments of Entisols and Ultisols in the Northeast of Brazil (Santos et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Magnetic Susceptibility of Soil to Differentiate Soil Environments in Southern Brazil

Ramos¹,

Dalmolin²,

Júnior³

et al. 2017

Rev. Bras. Ciênc. Solo

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ABSTRACT:The interest in new techniques to support digital soil mapping (DSM) is increasing. Numerous studies pointed out that the measure of magnetic susceptibility (MS) can be extremely useful in the identification of properties related with factors and processes of soil formation, applied to soil mapping. This study addressed the effectiveness of magnetic soil susceptibility to identify and facilitate the distinction of different pedogenic environments of a representative hillslope in the highland Planalto Médio in the state of Rio Grande do Sul (RS), Brazil. In a 350-ha area in the municipality of Santo Augusto, RS, a representative transect was selected, trenches opened for soil characterization and 29 grid points marked at regular distances of 50 m, where soil samples were collected (layers 0.00-0. 05, 0.05-0.15, 0.15-0.30, and 0.30-0.60 m) to analyze soil properties. Data from the transect samples were subjected to descriptive statistics. Limits of the pedogenetic environments along the slope were identified by the Split Moving Window (SMW) Boundary Analysis. The combined use of soil magnetic susceptibility and the SMW technique was effective in identifying different pedogenetic environments in the study area.

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Clay mineralogy and magnetic susceptibility of Oxisols in geomorphic surfaces

Cited by 55 publications

References 32 publications

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials

Magnetic Susceptibility of Soil to Differentiate Soil Environments in Southern Brazil

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