Illuviation intensity and land use change: Quantification via micromorphological analysis

Sauzet, Ophélie; Cammas, Cécilia; Barbillon, Pierre; Étienne, Marie‐Pierre; Montagne, David

doi:10.1016/j.geoderma.2015.11.035

Cited by 15 publications

(13 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The abrupt or clear and flat transition is common in the studied soils and, according to Resende (1983), the flat transition between the A and B horizons favors the idea of formation of the textural gradient by lateral loss of clay from the surface horizons. On the contrary, Sauzet et al (2016) found clear and smooth or gradual and smooth transitions between the surface horizons and the B horizons, in lluviation studies involving Luvisols with a substantial occurrence of clay skins in a dry and cold region of France. The water-dispersible clay (WDC) values of these soils were high (Table 1).…”

Section: Morphological and Physical Attributesmentioning

confidence: 77%

Lateral loss of clay in the genesis of Luvisols in the Semi-Arid Depression of the Jequitinhonha Valley, Minas Gerais - Brazil

et al. 2019

View full text Add to dashboard Cite

Soils of the semi-arid region of Minas Gerais have small depth; hard, very hard or even extremely hard consistency when dry and very plastic and very sticky when moist; columnar or angular blocky structure and significant cracking along the profile in the dry period, however they have not been deeply studied yet. Thus, the aim of this study was to detail the genesis of Luvisols in the Semi-arid Depression of the Jequitinhonha Valley (MG), incompassing morphological, physical, chemical, micromorphological and mineralogical attributes, and their relationships. The lack of illuviation coatings in the micromorphological analysis is in line with the expressionless and unclear clay skins observed in the top of the B horizon in only one out of the four soil profiles during the field work. Considering the occurrence of expandable 2:1 clay minerals, which can easily modify such pedological feature, caution is recommended in relation to soil genesis interpretation. The lateral loss of the clay fraction from the superficial horizons is highlighted as the main formation process of the Luvisols studied. The cation exchange capacity of these soils revealed remarkable lower values for the Luvisols in semi-arid Brazilian regions.

show abstract

Section: Morphological and Physical Attributesmentioning

confidence: 77%

Lateral loss of clay in the genesis of Luvisols in the Semi-Arid Depression of the Jequitinhonha Valley, Minas Gerais - Brazil

et al. 2019

View full text Add to dashboard Cite

show abstract

“…At the analysis stage, the images can function both as a mesoscale analysis tool and as a general, zoomable overview document during optical microscopy. The high resolution also benefits the use of image analysis applications, such as porosity analysis (e.g., Garguilo, Mele, & Terribile, 2013;Jangorzo, Watteau, & Schwartz, 2013;De Luca et al, 2015), soil macrofeature quantification (e.g., Aydemir, Keskin, & Drees, 2004), pedofeature quantification (e.g., Sauzet et al, 2015), or petrographic analysis (e.g., Tarquini & Favalli, 2010).…”

Section: Resultsmentioning

confidence: 99%

High‐Resolution Photography for Soil Micromorphology Slide Documentation

Carpentier

Vandermeulen

2016

Geoarchaeology

View full text Add to dashboard Cite

It is common practice today in soil micromorphology to scan slides with a flatbed scanner for slide documentation as well as for mesoscopic scale observation. However, the imagery produced by flatbed scanners often results in boundaries becoming diffuse when zooming in, a side effect of the continuously changing refraction of light caused by the moving scan head. This can be restricting or even unsatisfactory to specialists who rely on such imagery and while alternatives exist, their availability or suitability is not always guaranteed. This paper describes two variations on a static high‐resolution image acquisition method using a professional camera and common attributes of a standard photography studio. Minor postphotography processing too can be done with commonly used software packages. The presented method results in pictures with a resolution of 36 million pixels per image, providing high enough quality and resolution (approximately 4200 dpi) to allow the soil micromorphology practitioner to navigate the entire mesoscopic spectrum and as such offers a continuum of observation from the macroscopic scale to the optical microscopic observation at low (40×) magnification.

show abstract

“…This is also posited by micromorphological characteristics in this part of the sequence. Dusty cappings are possibly related to human activity (Figure ), which were recorded just below the erosional surface of Units 6 and 5, which are generally associated with exposed soils and/or soils affected by cultivation (Brammer, 1971; Gebhardt, 1988; Sauzet et al, 2016). Interestingly, charcoal fragments were recorded at the same stratigraphic position (Figures 6 and ), possibly as byproducts of fireplace events.…”

Section: Discussionmentioning

confidence: 99%

Depositional history of a talus cone in an arid intermontane basin in Central Asia: An interdisciplinary study at the Late Pleistocene–Late Holocene Obishir‐I site, Kyrgyzstan

et al. 2021

View full text Add to dashboard Cite

Cliff‐related talus accumulations are often highly affected by post‐depositional processes, and the sedimentological characteristics are poorly documented, especially in arid settings. In the southern margin of the Fergana Valley, Kyrgyzstan, the Obishir‐I is an archaeological site of the Epipaleolithic Obishirian industry, located within a talus cone. Archaeological excavations have allowed us to study the internal structure, chronology, and depositional history of the cone as well as the relationship between the slope processes and the archaeological assemblage. We applied a multiproxy approach, including sedimentological studies supported by the basic geochemistry of sediments, luminescence dating, paleoecology of fossil mollusks, and archaeological analyses. The Obishir‐I rockfall talus accumulated from the Last Glacial Maximum to the early part of the Middle Holocene. The talus onlaps the bedrock at the foot of a limestone cliff, and its chronology is coherent, spanning from ca. 19–8 ka B.P. The material is an unconsolidated, poorly sorted mixture of angular rock fragments accumulated by rockfall and fine‐grained materials accumulated by aeolian processes, illuviation, and in situ weathering. The sequence bears an archaeological collection attributed to two settlement phases: unidentified Upper Paleolithic and the Obishirian. Both assemblages are affected by post‐depositional relocation within the slope.

show abstract

Illuviation intensity and land use change: Quantification via micromorphological analysis

Cited by 15 publications

References 47 publications

Lateral loss of clay in the genesis of Luvisols in the Semi-Arid Depression of the Jequitinhonha Valley, Minas Gerais - Brazil

Lateral loss of clay in the genesis of Luvisols in the Semi-Arid Depression of the Jequitinhonha Valley, Minas Gerais - Brazil

High‐Resolution Photography for Soil Micromorphology Slide Documentation

Depositional history of a talus cone in an arid intermontane basin in Central Asia: An interdisciplinary study at the Late Pleistocene–Late Holocene Obishir‐I site, Kyrgyzstan

Contact Info

Product

Resources

About