Results 261 to 270 of about 65,909 (309)
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Annals of the Association of American Geographers, 1979
ABSTRACT Place-to-place variation within soil units influences the study and use of soil, but is seldom formally acknowledged in soil maps and descriptions. Research on soil variation could be improved by increased coordination of experimental designs and by application of statistical methods suitable for analysis of place-to-place variation, including
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ABSTRACT Place-to-place variation within soil units influences the study and use of soil, but is seldom formally acknowledged in soil maps and descriptions. Research on soil variation could be improved by increased coordination of experimental designs and by application of statistical methods suitable for analysis of place-to-place variation, including
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ANALYSIS OF SPATIAL VARIABILITY IN SODIC SOILS
Soil Science, 1988We prepared punctual and block-kriged maps of sodium adsoption ratio (SAR) of an experimental plot measuring 162 x 96 m for four depths. Positive definite, transitive, and isotropic spherical models were fitted based on grid sampling at 12-m intervals at depths of 0 to 30 (d4), 30 to 60 (d2), 60 ...
J. S. SAMRA +2 more
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Multifractal scaling of soil spatial variability
Ecological Modelling, 2005Abstract Soils data exhibit great complexity that spatial analyses try to understand. The geostatistical approach studies soil variability as the outcome of random processes and is characterized by means of the variogram. Multifractal analysis introduces a new methodology based on the determination of the scaling properties of the data set which are ...
F.J. Caniego +3 more
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2014
Spatial variability occurs at all scales—from micrometer scale (1–10 µm) relevant to microbial processes to continental scale (1000 km) relevant to the distribution of soil orders and climate change. The order of magnitude of the coefficient of variation (CV) of soil properties ranges from a few percent to greater than 100%.
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Spatial variability occurs at all scales—from micrometer scale (1–10 µm) relevant to microbial processes to continental scale (1000 km) relevant to the distribution of soil orders and climate change. The order of magnitude of the coefficient of variation (CV) of soil properties ranges from a few percent to greater than 100%.
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Multifractal Analysis of Soil Spatial Variability
Agronomy Journal, 1999Multifractal formalism was utilized to study variability of different soil properties, including soil‐test P and K, organic matter content, pH, Ca and Mg contents, and cation exchange capacity. Data from 1752 samples collected from a 259‐ha agricultural field in central Illinois were used in the study.
Alexandra N. Kravchenko +2 more
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Spatial variability of imazethapyr sorption in soil
Weed Science, 1999A significant limitation in using sorption coefficients (Kd) to predict solute transport through natural soils is the spatial variability of soil properties over large field areas. Spatial variability inKdfor imazethapyr was determined on representative samples from a 31.4-ha field, covering a pH range from 4.9 to 7.6 and an organic carbon (OC) range ...
Rubem S. Oliveira +5 more
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Spatial Variability of Light Morainic Soils
2010The aim of the study was to estimate spatial variability of soil texture with particular consideration of soil susceptibility to wind erosion and it shows that in Central Poland this variability is high even within small fields. The fields’ soil texture revealed a combined effect of the initial lithological variability of soil and the Aeolian selection
Michał Czajka +3 more
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Modelling spatial variability of soil parameters
Canadian Geotechnical Journal, 1990The purpose of this study is to show that geostatistics can help in finding the structure of the spatial variability of the undrained shear strength within a clay deposit. The site under study, B-6, owes its name to the earth dam that will be constructed on it; the site is located on the shore of the Broadback River in the James Bay area of Quebec ...
M. Soulié, P. Montes, V. Silvestri
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Soil spatial variability along transects
Soil Technology, 1991Abstract In this study, soil properties were measured along two parallel 100-m transects separated by 60 cm. Soil samples were taken at the 30 and 60 cm depths at 1 m intervals along each transect, for a total of 400 samples. Soil-water-characteristic curves, determined in the laboratory on these samples, were fitted to van Genuchten's five-parameter
B. Buchter +3 more
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Spatial variability of magnetic soil properties
SPIE Proceedings, 2004The presence of magnetic iron oxides in the soil can seriously hamper the performance of electromagnetic sensors for the detection of buried land mines and unexploded ordnance (UXO). Previous work has shown that spatial variability in soil water content and texture affects the performance of ground penetrating radar and thermal sensors for land mine ...
Remke L. van Dam +11 more
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