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Micromorphological techniques have frequently been used to describe processes leading to surface crusting. Image analysis can be helpful in quantifying changes in porosity necessary for estimating hydraulic parameters in crust infiltration models. The objective of this study was to quantify changes in pore area and frequency for three pore shapes (round, irregular, and elongate) and four size classes...
Gypsic and petrogypsic horizons occur in large areas of arid and semiarid regions of the world. The occurrence of gypsum in soils is considered a key feature by most soil classification and mapping systems that have coined specific names for these soils and horizons. However, the current methodology for description and definition of gypsic and petrogypsic horizons in the two most popular soil taxonomic...
In this study, we exploit dye patterns to identify flow types in macroporous soils as a step forward from using dye patterns simply as qualitative pictures that illustrate preferential flow. Dye tracer experiments at different irrigation rates and initial soil moisture conditions were carried out on three hillslope sites. Several vertical and horizontal soil sections were prepared after each experiment...
A methodological framework for spatial prediction based on regression-kriging is described and compared with ordinary kriging and plain regression. The data are first transformed using logit transformation for target variables and factor analysis for continuous predictors (auxiliary maps). The target variables are then fitted using step-wise regression and residuals interpolated using kriging. A generic...
Desiccation cracks play an important role in the drainage of excess water via the subsurface drainage system in clayey puddled paddy fields. The present study focuses on the linear inter-row cracks induced by water absorption from row-planted rice. The shrinkage behavior of clayey puddled soil, which can be regarded as the consolidation of saturated soil subject to pore water suction, was simulated...
The rare earth elements (REE), particle-size distribution and mineralogical composition in the <2 μm clay fraction from the soils on the floodplains developed by the three major rivers of the Brahmaputra, Meghna and Ganges in Bangladesh were analyzed. REE as the chondrite-normalized curve or the plot of Ce/Eu against Eu/Sm did not differentiate the soils according to the river floodplains, whereas...
Fulvic acid, Ca and Mg concentrations as well as dissolved inorganic carbon (DIC), pH and electric conductivity values of soil solutions, which resulted from injecting bidistilled water onto glass columns filled with different soils (black rendzina, brown rendzina, red clayey rendzina, red clay) characteristic of the Aggtelek karst system (NE Hungary), were determined. Identification and determination...
Soil survey leads to the publication of soil maps and textual reports to communicate the knowledge gained by the surveyors. The argument that soil maps and their legends are representations of structured knowledge is made and discussed with some examples. An epistemology of soil survey is outlined. The relationship between the mental model of a soil surveyor, a soil map legend, and a soil map is formally...
Soil samples from a colluviated soil profile in a rural area of Western Europe have been analyzed by HPLC for 15 polycyclic aromatic hydrocarbons (PAHs) in order to determine their total contents and distribution patterns. Stagnant water and reducing conditions prevail in a depth below 70 cm. The sum of the 15 PAHs varied between 11 and 200 μg kg -1 . The highest total contents of PAHs...
Samples from compacted soil have been prepared for scanning electron microscopy (SEM) using a technique that has been developed in order preserve the property under investigation. Using the SEM images, digital image analysis has been used to estimate semivariograms for the pore space of a compacted artificial soil. Strain ellipses quantifying the degree of heterogeneity have been constructed using...
A dye tracer visualization experiment was carried out in order to study the importance of preferential flow at forest-reclaimed mine soils. The objective was to evaluate iodine-starch staining for the identification of flow paths in such soils, for the commonly used dye tracer Brilliant Blue showed a poor contrast to the relatively dark lignitic mine soil. The experimental site was located in the...
Limited information exists on the changes in soil properties, particularly from the wet tropics of Australia, under long-term abandoned pasture, which was previously grazed and was established on deforested tropical rainforest. This information may be help in successful forest reestablishment. The objectives of this study were to assess the cumulative impact deforestation, grazed and abandoned pasture...
Due to rapid population growth, farmers in northern Burkina Faso have started to cultivate areas less suitable for agricultural production. In fields, situated at various geomorphologic settings, erodibility is highly variable resulting in variable wind-blown sediment fluxes. Furthermore, at a field scale, observations of wind-blown mass transport often show spatial variation.This study examines the...
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