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Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions

Emilia Urbanek Orcid Logo, Rory Walsh, Rick Shakesby

Hydrological Processes, Volume: 29, Issue: 12, Pages: 2799 - 2813

Swansea University Authors: Emilia Urbanek Orcid Logo, Rory Walsh, Rick Shakesby

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DOI (Published version): 10.1002/hyp.10404

Abstract

The influence of simulated cracks and roots on soil water repellency (SWR) dynamics with and without basal drainage impedance in wetting–drying cycles was investigated in the laboratory experiments. Observations and measurements were taken following water application equivalent to 9.2-mm rainfall an...

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Published in: Hydrological Processes
ISSN: 0885-6087
Published: Wiley 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa21375
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spelling 2020-12-16T16:56:09.6008568 v2 21375 2015-05-13 Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions 6d7e46bd913e12897d7f222ca78a718f 0000-0002-7748-4416 Emilia Urbanek Emilia Urbanek true false f3633408adc4dc477955b2eca4c4c9af Rory Walsh Rory Walsh true false e446d5dc2dad5add13364081e45c090c Rick Shakesby Rick Shakesby true false 2015-05-13 SGE The influence of simulated cracks and roots on soil water repellency (SWR) dynamics with and without basal drainage impedance in wetting–drying cycles was investigated in the laboratory experiments. Observations and measurements were taken following water application equivalent to 9.2-mm rainfall and then periodically during 80 h of drying. In total, 180 experiments were carried out using 60 samples of three homogeneous, reconstituted soils with different organic matter contents and textures, but of similar initial severity of SWR [18% molarity of an ethanol droplet (MED)]. Water flowing down the cracks and roots left the soil matrix largely dry and water repellent except for vertical zones adjacent to them and a shallow surface layer. A hydrophilic shallow basal layer was produced in experiments where basal drainage was impeded. During drying, changes in SWR were largely confined to the zones that had been wetted. Soil that had remained dry retained the initial severity of SWR, while wetted soil re-established either the same or slightly lower severity of SWR. In organic-rich soil, the scale of recovery to pre-wetting MED levels was much higher, perhaps associated with temporarily raised levels (up to 36% MED) of SWR recorded during drying of these soils. With all three soils, the re-establishment of the original SWR level was less widespread for surface than subsurface soil and with impeded than unimpeded basal drainage.Key findings are that as follows: (1) with unimpeded basal drainage, the soils remained at pre-wetting repellency levels except for a wettable thin surface layer and zones close to roots and cracks, (2) basal drainage impedance produced hydrophilic basal and surface layers, (3) thorough wetting delayed a return to water-repellent conditions on drying, and (4) temporarily enhanced SWR occurred in organic-rich soils at intermediate moisture levels during drying. Hydrological implications are discussed, and the roles of cracks and roots are placed into context with other influences on preferential flow and SWR under field conditions. Journal Article Hydrological Processes 29 12 2799 2813 Wiley 0885-6087 soil, soil water repellency, hydrophobicity 15 6 2015 2015-06-15 10.1002/hyp.10404 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University 2020-12-16T16:56:09.6008568 2015-05-13T17:26:31.2706733 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Emilia Urbanek 0000-0002-7748-4416 1 Rory Walsh 2 Rick Shakesby 3 0021375-03062015094410.pdf Urbanek-Switching.pdf 2015-06-03T09:44:10.8370000 Output 1017092 application/pdf Accepted Manuscript true 2015-11-19T00:00:00.0000000 true eng
title Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
spellingShingle Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
Emilia Urbanek
Rory Walsh
Rick Shakesby
title_short Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
title_full Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
title_fullStr Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
title_full_unstemmed Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
title_sort Patterns of soil water repellency change with wetting and drying: the influence of cracks, roots and drainage conditions
author_id_str_mv 6d7e46bd913e12897d7f222ca78a718f
f3633408adc4dc477955b2eca4c4c9af
e446d5dc2dad5add13364081e45c090c
author_id_fullname_str_mv 6d7e46bd913e12897d7f222ca78a718f_***_Emilia Urbanek
f3633408adc4dc477955b2eca4c4c9af_***_Rory Walsh
e446d5dc2dad5add13364081e45c090c_***_Rick Shakesby
author Emilia Urbanek
Rory Walsh
Rick Shakesby
author2 Emilia Urbanek
Rory Walsh
Rick Shakesby
format Journal article
container_title Hydrological Processes
container_volume 29
container_issue 12
container_start_page 2799
publishDate 2015
institution Swansea University
issn 0885-6087
doi_str_mv 10.1002/hyp.10404
publisher Wiley
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description The influence of simulated cracks and roots on soil water repellency (SWR) dynamics with and without basal drainage impedance in wetting–drying cycles was investigated in the laboratory experiments. Observations and measurements were taken following water application equivalent to 9.2-mm rainfall and then periodically during 80 h of drying. In total, 180 experiments were carried out using 60 samples of three homogeneous, reconstituted soils with different organic matter contents and textures, but of similar initial severity of SWR [18% molarity of an ethanol droplet (MED)]. Water flowing down the cracks and roots left the soil matrix largely dry and water repellent except for vertical zones adjacent to them and a shallow surface layer. A hydrophilic shallow basal layer was produced in experiments where basal drainage was impeded. During drying, changes in SWR were largely confined to the zones that had been wetted. Soil that had remained dry retained the initial severity of SWR, while wetted soil re-established either the same or slightly lower severity of SWR. In organic-rich soil, the scale of recovery to pre-wetting MED levels was much higher, perhaps associated with temporarily raised levels (up to 36% MED) of SWR recorded during drying of these soils. With all three soils, the re-establishment of the original SWR level was less widespread for surface than subsurface soil and with impeded than unimpeded basal drainage.Key findings are that as follows: (1) with unimpeded basal drainage, the soils remained at pre-wetting repellency levels except for a wettable thin surface layer and zones close to roots and cracks, (2) basal drainage impedance produced hydrophilic basal and surface layers, (3) thorough wetting delayed a return to water-repellent conditions on drying, and (4) temporarily enhanced SWR occurred in organic-rich soils at intermediate moisture levels during drying. Hydrological implications are discussed, and the roles of cracks and roots are placed into context with other influences on preferential flow and SWR under field conditions.
published_date 2015-06-15T03:25:20Z
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score 11.017797

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