Using of high-resolution topsoil magnetic screening for assessment of dust deposition: comparison of forest and arable soil datasets |
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Authors: | T magiera J Zawadzki |
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Institution: | (1) Institute of Environmental Engineering PAS, ul. Sklodowskiej-Curie 34, 41-819 Zabrze, Poland;(2) Warsaw University of Technology, 00-661, ul. Nowowiejska 20, Warszawa, Poland |
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Abstract: | Magnetic susceptibility (κ) is an easily detectable geophysical parameter that can be used as a proxy or semi-quantitative
tracer of atmospheric industrial and urban dusts deposited in topsoil. An enhanced κ value of topsoil is in many cases also
associated with high concentrations of soil pollutants (mostly heavy metals). High-resolution magnetic screening of topsoil
in areas of high pollution influx is a useful tool for detection of pollution “hot spots”. General and regional screening
maps with a grid density of 10 or 5 km have been performed on the basis of forest topsoil measurement only. The purpose of
this study was to perform high-resolution magnetic screening with different grid densities in both forested and agricultural
areas (arable land). Our large study area (ca. 200 km2) was located in a relatively more polluted region of the central part of Upper Silesia, and a second (small) one (ca. 100
m2) was located in the western part of Upper Silesia, with considerably lower influx of pollution. In the framework of this
study, we applied a statistical comparison of data obtained in forested areas and on arable land. The arable soil showed statistically
significantly lower κ values, the result of “physical dilution” of the arable layer caused by annual ploughing. Thus arable
soils must be avoided during high-resolution field measurement. From semivariograms, it was clear that the spatial correlations
in forest topsoil are much stronger than in arable soil, which suggests that a denser measurement grid is required in forested
areas. |
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Keywords: | Basic statistic Magnetic susceptibility Soil pollution Topsoil Semivariances |
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