Estimating hydraulic conductivity of a sandy soil under different plant covers using minidisk infiltrometer and a dye tracer experiment |
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Authors: | Marián Homolák Jozef Capuliak Viliam Pichler ?ubomír Lichner |
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Institution: | (1) Faculty of Forestry, Dep. Natural Environment, Technical University in Zvolen, T. G. Masaryka 24, SK-96053 Zvolen, Slovakia;(2) Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, SK-83102 Bratislava, Slovakia |
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Abstract: | The objective of this study was to estimate the hydraulic conductivity of sandy soil under different plant cover at the locality
Mláky II at Sekule (southwest Slovakia). Two sites were demarcated at the locality, with mainly moss species at glade site,
and pine forest at forest site. The estimation of unsaturated hydraulic conductivity was conducted by (a) minidisk infiltrometer
and (b) the analysis of a dye tracer total resident concentration. The latter approach assumed the applicability of the stochastic—convective
flow theory in the sandy soil. In the dye tracer experiment, two plots (1 × 1 m each) were established in both sites, and
100 mm of dye tracer (Brilliant Blue FCF) solution was applied on the soil surface. Similar results were obtained in both
plots, with more than 70 % area of horizons stained in the depth of 30–50 cm. In some cases, the predicted and measured hydraulic
conductivity were found within an order of magnitude, thus revealing similar impact of different plant cover on hydraulic
properties of sandy soil studied. In contrast to sandy soils used for agriculture, the influence of the plant/surface humus
and topsoil interface extended in the form of a highly heterogeneous matrix flow to the depth of 50–60 cm, where it was dampened
by horizontal layering. |
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Keywords: | dye tracer hydraulic conductivity plant cover sandy soil soil moisture |
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