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Soil surface roughness change and its effect on runoff and erosion on the Loess Plateau of China

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Abstract

As an important parameter in the soil erosion model, soil surface roughness (SSR) is used to quantitatively describe the micro-relief on agricultural land. SSR has been extensively studied both experimentally and theoretically; however, no studies have focused on understanding SSR on the Loess Plateau of China. This study investigated changes in SSR for three different tillage practices on the Loess Plateau of China and the effects of SSR on runoff and erosion yield during simulated rainfall. The tillage practices used were zero tillage (ZT), shallow hoeing (SH) and contour ploughing (CP). Two rainfall intensities were applied, and three stages of water erosion processes (splash erosion (I), sheet erosion (II) and rill erosion (III)) were analyzed for each rainfall intensity. The chain method was used to measure changes in SSR both initially and after each stage of rainfall. A splash board was used to measure the splash erosion at stage I. Runoff and sediment data were collected continuously at 2-min intervals during rainfall erosion stages II and III. We found that SSR of the tilled surfaces ranged from 1.0% to 21.9% under the three tillage practices, and the order of the initial SSR for the three treatments was ZT<SH<CP. For the ZT treatment, SSR increased slightly from stage I to III, whereas for the SH and CP treatments, SSR decreased by 44.5% and 61.5% after the three water erosion stages, respectively, and the greatest reduction in SSR occurred in stage I. Regression analysis showed that the changes in SSR with increasing cumulative rainfall could be described by a power function (R 2>0.49) for the ZT, SH and CP treatments. The runoff initiation time was longer in the SH and CP treatments than in the ZT treatment. There were no significant differences in the total runoff yields among the ZT, SH and CP treatments. Sediment loss was significantly smaller (P<0.05) in the SH and CP treatments than in the ZT treatment.

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Authors and Affiliations

  1. College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China

    LongShan Zhao, XinLan Liang & FaQi Wu

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  1. LongShan Zhao
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  2. XinLan Liang
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  3. FaQi Wu
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Correspondence to FaQi Wu.

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Zhao, L., Liang, X. & Wu, F. Soil surface roughness change and its effect on runoff and erosion on the Loess Plateau of China. J. Arid Land 6, 400–409 (2014). https://doi.org/10.1007/s40333-013-0246-z

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  • DOI: https://doi.org/10.1007/s40333-013-0246-z

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