Handbook for soil thin section description

Coninck, De

doi:10.1016/0016-7061(87)90006-1

Cited by 12 publications

(16 citation statements)

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“…After collection, the samples were air-dried and subsequently sieved, using a set of sieves of 9.7 and 8.0 mm mesh, selecting only aggregates retained within this range. These were taken to the laboratory, examined under magnifying glass and separated by hand into morphological fractions, identifying three classes of aggregates (biogenic, intermediate and physicogenic) using a method adapted by Pulleman et al (2005) from the morphological patterns established by Bullock, Fedoroff and Jongerius (1985) and validated by other authors (BATISTA et al, 2013;LOSS et al, 2014LOSS et al, , 2017.…”

Section: Methodsmentioning

confidence: 99%

“…Soil aggregates can be morphologically classified as physicogenic (formed by physical and chemical processes), biogenic (formed by the action of biological agents) (BULLOCK; FEDOROFF; JONGERIUS, 1985) and intermediate to these two types (PULLEMAN et al, 2005). The differentiation between the types of aggregates is performed based on their genesis or pathways of formation from morphological characteristics (BULLOCK; FEDOROFF; JONGERIUS, 1985;PULLEMAN et al, 2005;BATISTA et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management

et al. 2023

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Agroecological management can favor the improvement of soil attributes, especially soil organic matter (SOM) and soil aggregation. The objective of the study was to quantify the carbon contents of the humic and oxidizable fractions of SOM of aggregates from different origins from agroecological management systems. Five experimental areas located in the Integrated Agroecological Production System were evaluated: AFS – Agroforestry System; C-SUN – Coffee in full sun; C-SHA – Shaded coffee; AL-FLE – Cultivation in alleys of Flemingia macrophylla with green beans; and NT – No-tillage. The aggregates were separated, identified, and classified as to their origin or formation pathways into biogenic, intermediate, and physicogenic. The carbon contents of the humic fractions fulvic acid (C-FAF), humic acid (C-HAF) and humin (C-HUMF); and oxidizable fractions (F1 and F2, labile; and F3 and F4, recalcitrant) of SOM were determined. The greatest variations in the carbon values of the humic fractions were observed in the aggregates of the AFS, C-SUN and C-SHA systems. In relation to C-HUMF, the highest contents of this fraction were quantified in the biogenic and intermediate aggregates of the C-SUN, C-SHA and AL-FLE systems. The carbon contents of the oxidizable fractions of SOM showed variability between the management systems, mainly for the F1, F2 and F3 fractions in the aggregates under C-SUN and C-SHA. The C-SUN system showed a higher proportion of more humified and recalcitrant fractions of SOM when compared to the C-SHA system. The management practices maids in the agroecological systems of C-SHA, C-SUN and AFS promoted improvements in soil quality.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management

et al. 2023

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“…The micromorphology slides were described using a Leica Laborolux 12 Pol S polarizing microscope and an Olympus BX53 fluorescence microscope, and photographed using a Q‐Capture Pro digital camera and software system. The description of the thin sections follows the descriptive system developed by Bullock (1985) and Stoops and Vepraskas (2003).…”

Section: Methodsmentioning

confidence: 99%

Life near the water: Geoarchaeological investigation of site formation processes and occupation patterns at the near‐bank mound of Liangzhu City, China

et al. 2022

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The Liangzhu City site, located in the center of the Liangzhu Culture (3300–2300 cal. BC), is characterized by gigantic earthen mounds containing about 10 million m3 of earth, as well as crisscrossed waterways that flow through the mounds. This study presents a geoarchaeological study of a mound structure adjacent to the South Zhongjiagang channel of Liangzhu City. By applying soil micromorphological and associated bulk sedimentological analyses, this study reconstructed the site formation processes and multiple occupations of the mound structure together with related hydrological changes. The results suggest that this site is in a near‐bank activity area formed due to the build‐up of sequential settlement buildings and activity deposits. At least six intact activity surfaces have been recognized based on the presence of intact matting materials and the trampling of fine anthropogenic debris. This study thus reports the first detailed micromorphological study of Neolithic floor sequences in East China. In addition, lipid and isotope analyses of the plant material shed light on how Liangzhu people exploited grass materials, especially bamboo, for both long‐term and short‐term occupation near waterways. This study has demonstrated the potential of micromorphological studies for reconstructing site formation processes and identifying different types of human activities in a landscape that was highly modified by Neolithic people. The findings have far‐reaching implications for archaeological research around the Tai Lake region and investigations of other large earthen mound archaeological sites around the world.

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“…Aggregate formation pathways were identified using aggregates contained in the interval of the sieves, between 8.0 and 9.7 mm. The aggregates were examined under a magnifier, manually separated according to the definitions of Bullock et al (1985), and classified by morphological standards as: physicogenic, when presenting angular forms; and biogenic, when presenting round forms (which are caused by the intestinal tract of individuals of the soil macrofauna, mainly from the Oligochaeta subclass -earthworms) or root activity. The relative contribution in weight of aggregates was determined using 200 g of aggregates.…”

Section: Methodsmentioning

confidence: 99%

Biogenic and Physicogenic Aggregates Under Different Crops With Black Oat in Nova Friburgo, Brazil

et al. 2020

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ABSTRACT The objective of this study was to evaluate the efficiency of black oat (Avena strigosa Schreb) crops in recovering soil aggregation, and quantify the nutrient contents in aggregates considering their formation pathways (biogenic and physicogenic) in crop areas in a mountains environment in the municipality of Nova Friburgo, RJ, Brazil. The landscape was stratified into two sections for the study: upper, two areas with black oat crops, one fertilized and one not fertilized one not fertilized, and one adjacent forest area representing the original soil conditions; and lower: one fertilized area with black oat, and one fertilized area with black oat intercrops with oilseed radish (Raphanus sativus L.) and vetch (Vicia sativa L.), and one adjacent forest area representing the original soil conditions. The aggregates were separated according to their formation pathways, quantifying the weight percentage of each formation pathway. The aggregate stability and nutrient and organic carbon contents were evaluated. The fertilized area in the upper section had the highest biogenic aggregate percentage, which was associated with the highest total organic carbon contents, and soil fertility. This area also had the highest weighted mean diameter (WMD) and geometric mean diameter (GMD) of aggregates. The intercrop area in the lower section had the highest biogenic aggregate percentage and the lowest P, Ca+2, Mg+2, and K+ contents in the aggregates. The management systems affected the aggregate formation pathways. Morphological classification is an important tool for the monitoring of soil management. The black oat crops increased the biogenic aggregate formation, which become reservoir of nutrients.

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Handbook for soil thin section description

Cited by 12 publications

References 0 publications

Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management

Soil organic matter in biogenic, intermediate and physicogenic aggregates under agroecological management

Life near the water: Geoarchaeological investigation of site formation processes and occupation patterns at the near‐bank mound of Liangzhu City, China

Biogenic and Physicogenic Aggregates Under Different Crops With Black Oat in Nova Friburgo, Brazil

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