Impact of Vegetation Cover on Surface Runoff Hydraulic Characteristics with Simulated Rainfall

Jiamei, 孙佳美 Sun; Xinxiao, 余新晓 Yu; Dengxing, 樊登星 Fan; Hongru, 梁洪儒 Liang; Yu, 常玉 Chang; Hanzhi, 李瀚之 Li

doi:10.5846/stxb201310302620

Cited by 3 publications

(3 citation statements)

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“…Research by scholars analyzing the effective coverage and critical coverage of grass cover indicated that when the grassland vegetation coverage is 60-80%, it can effectively prevent soil erosion [35]. Compared with bare slopes, grassland vegetation cover has a limiting effect on runoff of about 80% [18,36,37]. In this study, under the rainfall intensity of 60 mm/h, when the grassland vegetation coverage was greater than 60%, the R 60 presented a rapid decline trend, and this trend was not significant under the other two rainfall intensities, which was also due to the excessive rainfall intensity.…”

Section: Discussionmentioning

confidence: 99%

“…The results show that as the rainfall intensity increases, the difference in soil infiltration rate between the initial and final stages increases [15,16]. On the slope covered with grass vegetation, the slope flow pattern is transitional flow and turbulent flow; the Reynolds number and Froude number will be changed by the change of the grass vegetation cover; the retarding effect of overland flow due to the influence of grassland vegetation decreases with increased runoff [17][18][19].…”

Section: Introductionmentioning

confidence: 96%

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Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region

Zhang

et al. 2023

Sustainability

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The rainfall in loess hilly and gully area is concentrated, and mostly comes in the form of rainstorms. The runoff on the slope caused by rainstorms is the main cause of serious soil and water loss in the loess hilly area, and the grassland vegetation has a good inhibitory effect on the runoff on the slope. Therefore, it is of great significance to reveal the role of grassland vegetation in the process of runoff generation, and the mechanisms for controlling soil erosion in this area. In this study, typical grassland slopes in hilly and gully regions of the loess plateau were taken as research objects. Through artificial rainfall in the field, the response rules of the slope rainfall-runoff process to different grass coverage were explored. The results show that: (1) With the increase in rainfall intensity, the inhibitory effect of grassland vegetation on slope runoff decreased, which was mainly reflected in the gradual decrease in runoff rate and runoff coefficient, and the time required to reach stability gradually shortened. (2) Under 60 mm/h rainfall intensity, the sensitivity of runoff coefficient to 31.5% of grass cover change is the lowest, and the cost performance of grass cover with 55% coverage is the highest. (3) Grass coverage inhibited slope runoff by changing the hydraulic characteristics of the slope, but this effect was only obvious in low rainfall intensity and early rainfall. Rainfall in the loess hilly area is characterized by intense rain. The regulating effect of grass cover on slope runoff is not particularly significant under high intensity rainfall. If only considering the regulation of grassland vegetation on slopes, more than 60% grassland coverage is more efficient in inhibiting slope runoff under medium and low intensity rainfall.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region

Zhang

et al. 2023

Sustainability

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“…In this regard, revegetation combined with engineering measures can obtain greater achievements in gully rehabilitation (Borja et al, 2018;Guyassa, Frankl, Zenebe, Poesen, & Nyssen, 2017;Reubens et al, 2009). More specifically, the protection provided by vegetation occurs partly by reducing overland flow energy dissipation by the vegetation canopy (Cantalice et al, 2019;Mu et al, 2019;Sun et al, 2015) and partly by reinforcing the topsoil with roots (De Baets & Poesen, 2010;Vannoppen, Vanmaercke, Baets, & Poesen, 2015;Zhang, Zhang, Yang, & Wang, 2019).…”

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confidence: 99%

The effectiveness of selected vegetation communities in regulating runoff and soil loss from regraded gully banks in the Mollisol region of Northeast China

et al. 2021

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The steep slopes of actively developed gullies are extremely sensitive to erosion in the Mollisol region of Northeast China; however, decision making on the optimal configuration for gully bank protection is under discussion. Here, five vegetation communities were established on regraded gully banks with bare slopes as the control to identify their controlling effects on flow hydraulics and soil erosion through in situ scouring experiments. A hydraulic flume experiment was conducted to clarify the ability of roots to reduce erosion. For vegetated slopes, flow velocity, stream power, and unit stream power decreased by 42-67%, 0-18%, and 44-68%, respectively, while flow depth, shear stress, the Darcy-Weisbach friction coefficient, and Manning coefficient increased by 55-150%, 69-156%, 5-22-times and 2-5-times, respectively. Changes in the seven flow hydraulic parameters were significantly influenced by vegetation coverage, aboveground biomass, root mass density and litter biomass (p < .05). Consequently, the five vegetation communities experienced decreased runoff and soil loss by 19-30% and 78-97%, respectively. Vegetation with tap-roots and rich roots of 1.0-2.0 mm in diameter was more effective in controlling gully bank erosion. Thus, the vegetation community consisting of Dactylis glomerata, Festuca arundinacea, Uraria crinita and Medicago sativa (25:25:25:25) is perfectly acceptable for gully bank protection in the Mollisol region of Northeast China. The results provide a scientific reference for selecting optimal vegetation configuration for gully bank rehabilitation.

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Response of soil nutrients and erodibility to slope aspect in the northern agro-pastoral ecotone, China

Wu,

Jia,

et al. 2024

SOIL

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Abstract. Soil erosion, considered a major environmental and social problem, leads to the loss of soil nutrients and the degradation of soil structure and impacts plant growth. However, data on the effects of land use changes caused by vegetation restoration on soil nutrients and erodibility for different slope aspects are limited. This study was conducted to detect the response of soil nutrients and erodibility to slope aspect in a typical watershed in the northern agro-pastoral ecotone in China. The following indexes were used to determine the improvement in soil nutrients and erodibility through a weighted summation method: the comprehensive soil nutrient index and the comprehensive soil erodibility index. The results showed that the vegetation types with the highest comprehensive soil quality index (CSQI) values on western, northern, southern, and eastern slopes were Pinus sylvestris and Astragalus melilotoides (1.45), Caragana korshinskii and Capillipedium parviflorum (2.35), Astragalus melilotoides (4.78), and Caragana korshinskii and Lespedeza bicolor (5.00), respectively. Slope aspect had a significant effect on understory vegetation characteristics, soil nutrients, and soil erodibility. Understory vegetation and soil characteristics explained 50.86 %–74.56 % of the total variance in soil nutrients and the erodibility. Mean weight diameter and total phosphorus were the main factors that affected the CSQI for different slope aspects. Our study suggests that the combinations of species, such as C. korshinskii and L. bicolor, were the optimal selection to improve soil nutrients and soil erodibility for any slope aspect.

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Impact of Vegetation Cover on Surface Runoff Hydraulic Characteristics with Simulated Rainfall

Cited by 3 publications

References 0 publications

Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region

Slope Runoff Process and Regulation Threshold under the Dual Effects of Rainfall and Vegetation in Loess Hilly and Gully Region

The effectiveness of selected vegetation communities in regulating runoff and soil loss from regraded gully banks in the Mollisol region of Northeast China

Response of soil nutrients and erodibility to slope aspect in the northern agro-pastoral ecotone, China

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