The effects of typical grass cover combined with biocrusts on slope hydrology and soil erosion during rainstorms on the <scp>Loess Plateau of China</scp>: An experimental study

Dan, Chenxi; Liu, Gang; Zhao, Yu-Guo; Shu, Chengbo; Shen, Enshuai; Liu, Chang; Tan, Qinghua; Zhang, Qiong; Guo, Zhen; Zhang, Yang

doi:10.1002/hyp.14794

Cited by 19 publications

(9 citation statements)

References 78 publications

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“…It also enters the macropore through the root system at the same time. Compared with bare soil, grass root promoted infiltration [ 36 ]. When the water film-thickening pore channels are cut off, the macromolecules already have access to large amounts of water through the root system.…”

Section: Results and Analysismentioning

confidence: 99%

Influence of acid rain and root reinforcement coupling factors on disintegration characteristics of expansive soil

et al. 2023

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The effect of soil fixation and anti-scour instability of slope vegetation generally depends on the strength and anti-disintegration ability of slope soil due to increase of root system. Therefore, it is particularly necessary to study the disintegration characteristics of expansive soil related to slope instability under acidic conditions (simulated acid rain). In this paper, the response surface method (RSM) was used with the pH value, root diameter, root length, root coefficient, and distribution as independent variables, and the disintegration amount of root-soil (DARS) after 60min as the response value. Then X-ray diffractometer (XRD) was used to analyze the mineral composition changes of the sample under this environment. Simultaneously, the plasticity index of expansive soil at different values of pH was studied to discuss the disintegration mechanism of root compound expansive soil in an acid environments. The results show that the root system improves the anti-disintegration characteristics of the root-soil, and the effects of various factors on the amount of disintegration were as follows: root length > pH value > root distribution > root amount > root diameter. The DARS with a length of 20mm increased by 26.67% and 41.56% compared to the 30mm and 40mm. Compared to the horizontal distribution and horizontal + slant distribution, the DARS with slant distribution was increases by 11.39% and 20.24% respectively. The DARS with 2 roots is increased by 9.92% and 16.75% compared to 4 and 6 roots respectively. The 1mm diameter DARS is 6.65% and 15.49% higher than the 2mm and 3mm, respectively. In addition, an acidic environments can lead to an increase in the amount of disintegration or rate of disintegration. The disintegration at pH = 4.2 was increased by 11.4% and 22.4% compared to pH = 5.6 and pH = 7, respectively. The acidity affects soil disintegration is due to the hydrophilic minerals in the expansive soil react with H+ ion in the acid solution to form soluble salts. Due to the dissociation and leaching of free quartz and metal oxides in the soil to varying degrees, the ability of expansive soil to accumulate is reduced. The intensity of erosion and leaching decreases with increasing pH. In addition, the pH value can affects the plasticity index of the soil, which increases with the increasing pH, thus affects the disintegration properties of the expansive soil.

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Section: Results and Analysismentioning

confidence: 99%

Influence of acid rain and root reinforcement coupling factors on disintegration characteristics of expansive soil

et al. 2023

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“…Vegetation can effectively control soil erosion, especially when it grows on the middle and lower parts of the slope (Dan et al, 2023; Shi, Li, et al, 2022; Shi, Xiao, et al, 2022). However, during extreme storm events, the effects of vegetation on reducing runoff and sediment may be limited because of thresholds associated with the regulation of hydrological processes.…”

Section: Discussionmentioning

confidence: 99%

“…Revegetation on slopes can effectively reduce the runoff and sediment yields (Zhang et al, 2014; Zhang et al, 2018; Yu, Zhu, et al, 2023). Vegetation directly intercepts rainfall through forest canopy and can enhance slope roughness and soil erosion resistance (Dan et al, 2023). Construction of check dams is also effective at reducing runoff and sediment production in slope‐gully systems.…”

Section: Discussionmentioning

confidence: 99%

“…Severe soil erosion has been reported in this area owing to its steep slopes, loose soil and sparse vegetation (Jia et al, 2020; Zhu et al, 2021). Serious soil erosion will lead to soil fertility decline, soil degradation and soil pollution and other ecological and environmental problems (Dan et al, 2023; Shi, Xiao, et al, 2022). Therefore, controlling soil erosion in slope‐gully systems is essential for soil and water conservation in the Loess Plateau and other similar areas worldwide.…”

Section: Introductionmentioning

confidence: 99%

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Synergy between vegetation patterns and sedimentation has a temporal effect on water erosion in a slope‐gully system

Bai,

Shi,

Wang

et al. 2023

European J Soil Science

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Multiple soil and water conservation measures applied together perform better at reducing runoff and sedimentation than individual measures, which can be attributed to their synergistic effects on water erosion. However, whether these synergistic effects are always effective at reducing water erosion remains unclear. In this study, a series of physical models representing a slope‐gully system were tested to quantify the trend of synergistic effects of multi‐measure over time through simulated rainfall. The tested scenarios included four vegetation patterns on the slope—Pattern A: no grass, Pattern B: grass on the up‐slope, Pattern C: grass on the middle‐slope and Pattern D: grass on the down‐slope—and five levels of runoff path length decrease (RPLD) in the gully caused by sedimentation of a check dam (0, 1, 2, 3 and 4 m). Synergistic effects on runoff and sediment yields were influenced by vegetation patterns and RPLDs. Under the same vegetation patterns, synergistic effects increased with increase of RPLD. Under the same RPLD, the mean value of synergistic effects on runoff was in the following order: Pattern D (0.10%) > Pattern C (0.09%) > Pattern B (0.06%), and synergistic effects on sediment yields had a similar order: Pattern D (0.60%) > Pattern C (0.42%) > Pattern B (0.22%). Under Pattern B, based on the Mann–Kendall trend test, the synergistic effects on the runoff yields decreased over time. Contrastingly, under Patterns C and D, the synergistic effects on the runoff yields increased over time. The results show that the synergistic effect has time effect, and its change trend is related to vegetation patterns. Additionally, the results suggest that the middle‐ and lower‐slopes should be prioritized when restoring vegetation as the synergistic effects on runoff tend to increase when these have good vegetation cover.

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“…As the key component of soil texture, the content and distribution of gravel particles affect soil physical structure and hydrological processes such as soil water storage, runoff, water infiltration, solute transport, and water flow (Dan et al, 2023; Mahinroosta & Oshtaghi, 2021; Qiu et al, 2015; Smets et al, 2011; Wang et al, 2019); they also could reduce the mechanical resistance to root extension (Alameda & Villar, 2012), and may cause root aggregation and growth (Clark et al, 2003). Howover, the impact and the underlying mechanism of soil gravels are relatively complex (Han et al, 2021; Li, Wang, et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

You,

Wu,

Han

et al. 2024

Land Degrad Dev

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Soil gravel content strongly affects ecological restoration; however, the response and mechanism of plant traits to soil gravel content under the sensitive and fragile natural environment of Qinghai‐Tibet Plateau remains unclear. Herein, soils with three gravel content (10%, 30%, 50%) in the southeastern Tibetan Plateau were selected, and three plant species (one native plants of Elymus dahuricus (Ed), and two introduced ones of Festuca elata (Fe) and Medicago sativa (Ms)) were used in seven planting patterns with different proportions (Fe, Ed, Ms, Fe + Ed (1:1), Fe + Ms (2:1), Ed + Ms (2:1), Fe + Ed + Ms (2:2:1)). Plant traits, phytochemical properties and soil stoichiometric characteristics were measured to explore the interactive effects of soil gravels and plant species on vegetation restoration. Average plant height, coverage, shoot biomass, and total biomass were most affected by plant species (F = 277–611, p < 0.01), followed by gravel content (F = 90–195, p < 0.01) and their interaction (F = 5–51, p < 0.05); root biomass was most affected by gravel content (F = 130, p < 0.01). Among plant species, shoot and root biomass, total biomass overall decreased in the order of Fe + Ed + Ms>Fe>Fe + Ms>Fe + Ed>Ms>Ms + Ed>Ed. Plant total biomass, shoot biomass, root biomass and shoot/root ratio among different soils overall decreased in the order of low> high> medium gravel contents. All plant species were restricted by soil nitrogen except for Ed and Ed + Ms (N:P > 14). In addition, increasing the gravel content in the soil will increase the soil bulk density and reduce the total soil porosity. The total soil porosity is significantly positively correlated with the average plant height, coverage, aboveground biomass, and total biomass of plants (r = 0.78–0.91, p < 0.05). The total nitrogen content, total phosphorus (TP) content, and N: P in rhizosphere soil were significantly positively correlated with the average plant height, coverage, aboveground biomass, root biomass, and total biomass of plants (r = 0.70–0.97, p < 0.05), but soil N was significantly positively correlated with aboveground biomass and total biomass (r = 0.69, 0.71, p < 0.05), and there was no significant difference in soil TP content between them. The gravel content directly affects plant growth by changing bulk density and total porosity, but the combined effect of soil nutrients and plants affects plant growth. Therefore, optimizing the configuration of soil properties (mainly nitrogen and compactness) and plant species (isecologic niche plants) is an effective strategy for ecological restoration in the Qinghai‐Tibet Plateau.

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The effects of typical grass cover combined with biocrusts on slope hydrology and soil erosion during rainstorms on the Loess Plateau of China: An experimental study

Cited by 19 publications

References 78 publications

Influence of acid rain and root reinforcement coupling factors on disintegration characteristics of expansive soil

Influence of acid rain and root reinforcement coupling factors on disintegration characteristics of expansive soil

Synergy between vegetation patterns and sedimentation has a temporal effect on water erosion in a slope‐gully system

Soil gravel content and plant species configuration control vegetation restoration in Qinghai‐Tibet Plateau

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