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Water 2018, 10(7), 915; https://doi.org/10.3390/w10070915

The Effects of Litter Layer and Topsoil on Surface Runoff during Simulated Rainfall in Guizhou Province, China: A Plot Scale Case Study

1,2,* , 1,2
,
1,2
and
3
1
School of Geographic and Environmental Science, Guizhou Normal University, Guiyang 550001, China
2
State Engineering and Technology Institute for Karst Desertification Control, Guizhou Normal University, Guiyang 550001, China
3
Satellite Environment Center of MEP, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Received: 25 May 2018 / Revised: 25 June 2018 / Accepted: 9 July 2018 / Published: 11 July 2018
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Abstract

Litter layers and topsoil have important effects on surface runoff. To investigate these effects at the plot scale, artificial rainfall experiments were conducted on micro-runoff plots in Guizhou Province, China. Three types of plots were selected, the thin litter layer with low soil bulk density type (T-L type), the thick litter layer with high soil bulk density type (T-H type), and the moderate litter depth and soil bulk density type (M type), and three artificial rainfall intensities (30 mm/h, 70 mm/h, 120 mm/h) were used. The runoff volume was largest in the T-H type plot at different rainfall intensities and durations. Runoff in the M type plot had characteristics of both the T-L and T-H type plots. The runoff yielding speed was significantly higher and the runoff yielding time was significantly lower in the T-H type plot. In general, the runoff coefficient was the smallest in the T-L type plot and largest in the T-H type plot. The variations in the runoff coefficient were 15.6%, 19.3%, and 5.8% for the T-L, T-H, and M type plots respectively. The results of this study can improve the understanding of surface runoff processes at the plot scale under different litter and surface soil conditions. View Full-Text
Keywords: runoff; simulated rainfall; plot scale; litter layer; topsoil; karst runoff; simulated rainfall; plot scale; litter layer; topsoil; karst
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, Q.; Zhou, X.; Luo, Y.; Cai, M. The Effects of Litter Layer and Topsoil on Surface Runoff during Simulated Rainfall in Guizhou Province, China: A Plot Scale Case Study. Water 2018, 10, 915.

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