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Quantification of physical soil crust thickness and its effects on runoff and sediment yield
Ist Teil von
Soil Science Society of America journal, 2022-05, Vol.86 (3), p.630-642
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Physical soil crusts will form on most soils during and after rainfall and it has important effects on the runoff and sediment on slopes. However, objective and effective methods for quantifying the characteristics of physical soil crusts (such as the thickness) are not currently available. A new method was used for determining the thickness of physical soil crusts based on X‐ray computed tomography (CT) in order to quantify the thickness of the structural crust (SC) and depositional crust (DC) for two typical erodible soils comprising granite red soil (GRS) and Quaternary red clay (QRC) in the red soil region of southern China. The pores in the GRS and QRC were characterized as finely and densely spatially distributed, with an average porosity of 15.47% and a range of 1.66–28.83%. The soil porosity increased rapidly in the 0‐to‐3‐mm depth, but the porosity of the SC and DC soil samples generally decreased or was stable in the 3‐to‐30‐mm depth. The average thickness of the soil crust was 1.31 mm, and the average thicknesses of SC and DC were 1.16 and 1.46 mm, respectively. The thickness of SC of GRS decreased with the slope, whereas the thickness of DC of QRC generally increased with the slope. The thickness of SC increased with runoff yield and its contribution rate to the runoff and sediment yield cannot be neglected. The study provides a method for the objective quantification of physical soil crust and can deepen the research on slope erosion process and influencing factors.
Core Ideas
An X‐ray computed tomography‐based method was used to quantify the thickness of physical soil crusts.
The average thicknesses of structural and depositional crusts were 1.16 and 1.46 mm, respectively.
Generally, thickness of structural crust increased and depositional crust decreased with slope gradient.
Physical soil crust had a nonnegligible contribution to runoff and sediment yield increment.
Sprache
Englisch
Identifikatoren
ISSN: 0361-5995
eISSN: 1435-0661
DOI: 10.1002/saj2.20396
Titel-ID: cdi_crossref_primary_10_1002_saj2_20396
Format
–
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