Effects of erosion degree and rainfall intensity on erosion processes for Ultisols derived from quaternary red clay

Wu, Xi; Wei, Yujie; Wang, Junguang; Xia, Jinwen; Cai, Chang; Wu, Lingfeng; Fu, Zhiyong; Wu, Zhiyuan

doi:10.1016/j.agee.2017.08.023

Cited by 55 publications

(21 citation statements)

References 45 publications

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“…C TP in overland flow was relatively high at the initial stage and then it declined with time of runoff. The early observed high concentration was similar to the first flush effect that happened during an urban storm event [2] and the reason might be that the rainfall splashes disrupted soil aggregates and entrained particulates once overland flow produced enough shear stress [10,40]. The average C TP in overland flow presented a positive relationship with rainfall intensity and slope angle.…”

Section: Tp Loss Through Overland Flow and Interflowsupporting

confidence: 53%

“…Soil erosion not only causes the loss of nutrients, such as N and P, but also impacts the sustainable development of agriculture by causing soil degradation and land productivity decline [8]. At present, there are many studies on soil erosion for the red soils in Southeast China [9,10]. However, mechanisms of nutrient loss from the bare weathered granite slopes need to be further studied.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus Loss through Overland Flow and Interflow from Bare Weathered Granite Slopes in Southeast China

et al. 2019

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Phosphorus (P) is the key limiting factor for eutrophication, and the mechanism of P loss from hillslopes is complex. Few attempts have been made to study the processes of P loss through overland flow and interflow from bare weathered granite slopes in Southeast China. Therefore, artificial rainfall simulations were performed to evaluate P loss from bare weathered granite slopes with different slope angles (5°, 8°, 15°, 25°) and different rainfall intensities (1.5, 2.0, 2.5 mm/min). The results show that overland flow increased with rainfall intensity, while it declined with slope angle. Interflow exhibited a single-peak curve with time of runoff. The interflow accounted for 28.53–89.12% of the total runoff yield, and the percentage declined with rainfall intensity and increased with slope angle. Both total phosphorus (TP) concentration (CTP) and TP load (LTP) in overland flow increased with rainfall intensity, and the percentages of LTP in each rainfall event ranged from 51% to 92%. CTP in overland flow distinctly fluctuated, with the maximum appearing on the 25° slope, while the maximum in interflow was observed on the 5° slope. LTP in overland flow was the highest on the 8° slope, and was significantly affected by runoff yield and rainfall intensity (p < 0.01). LTP in interflow was small and was significantly affected by rainfall intensity (p < 0.01). Runoff P was mainly lost through overland flow, dominantly in the form of particulate phosphorus (PP), and P loss through interflow was an important supplementation, mainly in the form of dissolved phosphorus (DP). These results provide underlying insights and scientific background for the control of P loss in bare weathered granite areas.

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Section: Tp Loss Through Overland Flow and Interflowsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Phosphorus Loss through Overland Flow and Interflow from Bare Weathered Granite Slopes in Southeast China

et al. 2019

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“…(2017) and Wu et al . (2017) both found that soil loss increased with increased rainfall intensity 79 , 80 .…”

Section: Resultsmentioning

confidence: 94%

Characteristics of pulsed runoff-erosion events under typical rainstorms in a small watershed on the Loess Plateau of China

Jiang

2018

Sci Rep

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The pulsed events of rainstorm erosion on the Loess Plateau are well-known, but little information is available concerning the characteristics of superficial soil erosion processes caused by heavy rainstorms at the watershed scale. This study statistically evaluated characteristics of pulsed runoff-erosion events based on 17 observed rainstorms from 1997–2010 in a small loess watershed on the Loess Plateau of China. Results show that: 1) Rainfall is the fundamental driving force of soil erosion on hillslopes, but the correlations of rainfall-runoff and rainfall-sediment in different rainstorms are often scattered due to infiltration-excess runoff and soil conservation measures. 2) Relationships between runoff and sediment for each rainstorm event can be regressed by linear, power, logarithmic and exponential functions. Cluster Analysis is helpful in classifying runoff-erosion events and formulating soil conservation strategies for rainstorm erosion. 3) Response characteristics of sediment yield are different in different levels of pulsed runoff-erosion events. Affected by rainfall intensity and duration, large changes may occur in the interactions between flow and sediment for different flood events. Results provide new insights into runoff-erosion processes and will assist soil conservation planning in the loess hilly region.

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“…The sediment transport could be divided into three parts, namely suspended, saltating and contact (rolling) loads (Wu et al, 2017). The size classes of the lowest transport rates could be set as a boundary between the suspension-saltation and bed load modes of transport (Asadi et al, 2011).…”

Section: Effects Of Rock Fragments On Soil Loss In Purple Soilsmentioning

confidence: 99%

Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope

Han

Wang

Song

et al. 2019

Earth Surf Processes Landf

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A deeper understanding of the sediment characteristics associated with rock fragment content can improve our knowledge of the erosional processes and transport mechanisms of sediments on steep rocky slopes. This research used simulated rainfall experiments lasting for 1 h at a rate of 90 mm h−1 and employed 5 × 1 × 0.4 m parallel troughs filled with purple soils with different rock fragment volumetric contents (0, 5, 10, 20, 30 and 40%) on a 15° slope gradient. For each simulated event, runoff and sediment were sampled at 1‐ and 3‐min intervals, respectively, to study, in detail, the temporal changes in the size distributions of the eroded sediments. The results show that sediment concentrations, soil erosion rates and soil loss ratios significantly decreased as rock fragment content increased for rock fragment contents from 0 to 40% in purple soils. During the transportation process, clay particles often formed aggregates and were then transported as larger particles. Silt particles were more likely to be transported as primary particles with a low degree of sediment aggregation. Sand‐sized particles, which constituted a greater proportion of the original soil than the eroded sediments, were formed from other fine particles and transported as aggregates rather than as primary particles. Suspension‐saltation, which mainly transports fine particles of 0.02–0.05 mm and coarse particles larger than 0.5 mm in size, was the most important transport mechanism on steep rocky slopes. The results of this study can help to explain the inherent laws of erosional processes on steep rocky slopes and can provide a foundation for improving physical models of soil erosion. © 2019 John Wiley & Sons, Ltd.

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Effects of erosion degree and rainfall intensity on erosion processes for Ultisols derived from quaternary red clay

Cited by 55 publications

References 45 publications

Phosphorus Loss through Overland Flow and Interflow from Bare Weathered Granite Slopes in Southeast China

Phosphorus Loss through Overland Flow and Interflow from Bare Weathered Granite Slopes in Southeast China

Characteristics of pulsed runoff-erosion events under typical rainstorms in a small watershed on the Loess Plateau of China

Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope

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