Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

Matías, Sammy Sidney Rocha; Júnior, José Marques; Siqueira, Diego Silva; Pereira, Gener Tadeu

doi:10.1590/s0100-69162014000400009

Cited by 9 publications

(21 citation statements)

References 24 publications

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“…The reflections were most marked in the 0.30-0.60 m layer, comprising the most stable pedogenetic soil horizons, but some peaks in the surface layer coincided with the peaks of the deepest layer. Findings of Matias et al (2014), based on the same MS analysis procedure, indicated more pronounced peaks in the 0.30-0.80 m layer. The identification of the limits of landscape compartments was validated by the peaks of the SMW analysis.…”

Section: Resultsmentioning

confidence: 86%

“…In tropical soils, MS has been used to indicate the relationship between landscape and iron oxides, considered indicators of the factors and processes of soil formation Matias et al, 2014Matias et al, , 2015. For being directly related with iron oxides, MS is a covariate of soil mineralogical properties and consequently of different pedogenetic environments, here called landscape compartments (relief).…”

Section: Introductionmentioning

confidence: 99%

“…Some authors applied geostatistics to determine the perimeter of pedogenetically different environments Marques Jr et al, 2014). The "Split Moving Window" (SMW) boundary analysis has been used in cases of landscape compartmentalization and to identify pedogenetic limits in a single direction (Matias et al, 2014;Siqueira et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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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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“…The properties considered biological indicators of soil quality are microbial biomass, breathing and nitrogen biological fixation; as chemical indicators, there are pH, organic carbon, effective CEC, N, P, K, Ca, Mg, and electrical conductivity (DIÓGENES et al, 2013;MATIAS et al, 2014). As physical indicators: soil density, soil resistance to penetration, porosity, and aggregate stability (REYNOLDS et al, 2009;IMAZ et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic signature has been used for mineral quali-quantitative analysis in tropical soils (BAHIA et al, 2015), as indicator of environmental quality for CO 2 emissions (BARRIOS et al, 2012;LEAL et al, 2015), identifying distinct landscapes or land boundaries (MATIAS et al, 2014) and areas of potential erosion (SANTOS et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Magnetic Susceptibility as Indicator of Soil Quality in Sugarcane Fields

et al. 2017

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-Sugarcane management practices (unburned cane -UC and burned cane -BC) interfere with dynamics of soil magnetic properties. This study focused on determining the potential of magnetic susceptibility as soil quality indicator in areas under sugarcane cultivation. The experiment area is on the limit between basalt from São Bento Group, Serra Geral Formation, and sandstone from Bauru Group -Adamantina Formation. Twenty soil samples were collected from two management areas (burned and unburned sugarcane prior to harvest) at a depth range of 0.0-0.2 m. Local soil was classified as eutroferric Red Latosol (Oxisol), with highly clayey texture. Chemical and physical properties, CO 2 emissions and magnetic susceptibility (MS) in air-dried fine earth (MS ADFE ), total sand fraction (MS TS ) and clay fraction (MS CF ). The magnetic signature from MS was effective in identifying changes of physical, chemical and mineralogical traits in Latosols under burned and unburned sugarcane crop. The information provided here can guide further studies on the genesis of minerals with magnetic expression in environments and exposed to fire burning.Keywords: Magnetic signature. Applied Geophysics. Neo-formation. Multivariate Statistics. SUSCETIBILIDADE MAGNÉTICA COMO INDICADOR DE QUALIDADE DO SOLO EM ÁREAS SOB CULTIVO DE CANA-DE-AÇÚCARRESUMO -As práticas de manejo utilizadas na cultura da cana-de-açúcar (cana crua -CC e cana queimada -CQ) interferem na dinâmica dos atributos e expressão magnética do solo. Foi estudado o potencial da suscetibilidade magnética como indicador de qualidade do solo em áreas sob cultivo de cana-de-açúcar. O experimento localiza-se em uma área limítrofe de material de origem, entre o Basalto do Grupo São Bento, Formação Serra Geral, e o Arenito do Grupo Bauru, Formação Adamantina. Foram coletadas 20 amostras de solo em dois sistemas de manejo (com e sem queima da cana-de-açúcar para colheita) na profundidade de 0,0-0,2 m. O solo foi classificado como Latossolo Vermelho Eutroférrico, textura muito argilosa. Foram avaliados os atributos químicos, físicos, emissão de CO 2 e a suscetibilidade magnética (SM) do solo na terra fina seca ao ar (SM TFSA ), fração total sand (SM AT ) e fração argila (SM ARG ). A assinatura magnética expressa pela suscetibilidade magnética foi eficaz na identificação de mudanças nas características físicas, químicas e mineralógicas de Latossolos sob sistemas de colheita da cana-de-açúcar com e sem queima. As informações geradas neste trabalho podem balizar futuros estudos sobre a gênese de minerais com expressão magnética em ambientes e expostos a presença de fogo.Palavras -chave: Assinatura magnética. Geofísica aplicada. Neoformação. Estatística Multivariada.

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Mapping units based on spatial uncertainty of magnetic susceptibility and clay content

Teixeira

Marques

Siqueira

et al. 2018

CATENA

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This study aimed to use spatial uncertainty of magnetic susceptibility (MS) and clay content to improve soilmapping units. In an experimental area of 870 ha, a regular sampling grid containing 371 points was set, in which MS and clay content were assessed at a depth range of 0-0.25 m. Using a digital elevation model and field observations, a 4440-m transect was established on the study area from hilltop to the foothill, toward the gentlest slope. Standard deviation maps based on 200 realizations of the sequential gaussian simulation measured spatial estimate uncertainties. To limit transition zones along the transect, uncertainty isolines representative of the transition between soil-mapping units were selected. Both attributes presented peaks of uncertainties near the change of mapping units, previously known. Uncertainty zones, previously delineated, ranged from 45 to 210 m and from 60 to 170 m, for MS and clay content, respectively. However, after extrapolating the uncertainties to the side of the transect, amplitude changes of the uncertainty zones were observed, especially in the transition regions between landscape shape and geology. Delineation of mapping units, which incorporated the uncertainties of MS and clay content, was similar. However, due to lower cost and promptness, MS becomes the most feasible alternative. Knowing spatial uncertainties enables readjusting limits in maps of soil-mapping units and may support identification of most favorable regions for determining modal pedon representative of each unit.

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Outlining precision boundaries among areas with different variability standards using magnetic susceptibility and geomorphic surfaces

Cited by 9 publications

References 24 publications

Magnetic Susceptibility of Soil to Differentiate Soil Environments in Southern Brazil

Magnetic Susceptibility of Soil to Differentiate Soil Environments in Southern Brazil

Magnetic Susceptibility as Indicator of Soil Quality in Sugarcane Fields

Mapping units based on spatial uncertainty of magnetic susceptibility and clay content

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