Field measurement of soil water repellency and its impact on water flow under different vegetation |
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Authors: | L’ubomír Lichner Paul D Hallett Debbie S Feeney Olívia ?ugová Miloslav ?ír Miroslav Tesa? |
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Institution: | (1) Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, SK-83102 Bratislava, Slovakia;(2) Environment-Plant Interactions Programme, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, UK;(3) Institute of Landscape Ecology, Slovak Academy of Sciences, Štefánikova 3, SK-81499 Bratislava, Slovakia;(4) Institute of Hydrodynamics, Academy of Sciences of the Czech Republic, Pod Pat’ankou 30/5, CZ-16612 Praha 6, Czech Republic |
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Abstract: | Numerous recent laboratory studies have shown that vegetation can influence soil water flow by inducing very low levels of
water repellency. In this study we extended on this previous research by developing a field-based test using a miniature infiltrometer
to assess low levels of water repellency from physically based measurements of liquid flow in soil. The field-based test was
verified through a simple laboratory experiment and then applied to determine the impact of vegetation and antecedent soil
water content. The soil hydraulic properties determined were hydraulic conductivity, sorptivity, as well as the persistence
and index of water repellency. Tests were conducted following a dry spell and wet spell on (1) forest soil (0 cm depth), (2)
glade soil (0 cm depth) and (3) glade soil (50 cm depth). It was found that both the persistence and index of water repellency,
R, decreased in the order as follows: forest soil > glade soil (0 cm) > glade soil (50 cm) for both dry and wet spell. The
range of values of R was 0.28 (wettable) to 360 (highly water repellent), which affected hydraulic conductivity k
r(−2 cm). R increased and hence k
r(−2 cm) decreased in the order: forest soil < glade soil (0 cm) < glade soil (50 cm) for both the dry and wet spell. There
were clear interactions between vegetation and changes to water flow caused by presence of repellency.
Presented at the International Conference on Biohydrology, Prague, Czech Republic, 20–22 September 2006. |
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Keywords: | hydraulic conductivity sandy soil vegetation water repellency |
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