Impact of slope position on soil erodibility indicators in rolling hill regions of northeast China

Chen, Shiqi; Zhang, Guanghui; Zhu, Pingzong; Wang, Chengshu; Wan, Yuanqiang

doi:10.1016/j.catena.2022.106475

Cited by 29 publications

(8 citation statements)

References 62 publications

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“…Significant differences in clay and sand particles were found among the three land uses, probably owing to less residue and weed cover in the farmland during the maize growth season, bringing about high rates of soil erosion and leaching (Arunrat et al, 2021). The spatial variation in soil texture was complex on the karst hillslopes and different from that in other areas reported in previous studies (e.g., Chen et al, 2022; Haruna, 2021). These results suggest that land use and slope position play a key role in soil bulk density and soil particle distribution, which further supports spatial variations in soil erosion.…”

Section: Discussioncontrasting

confidence: 79%

“…The soil bulk density of farmland and forestland first increased and then decreased with the decline in slope position. This phenomenon was ascribed to the existence of eluviation zones at the upper and lower slope positions leading to sediment being transported from the upper slope and accumulating in the middle slope (Chen, Li, & Zhang, 2023). Consequently, the soil bulk density and silt content at the middle slope position were much higher than those at the other slope positions.…”

Section: Discussionmentioning

confidence: 99%

“…Topographic slope position, as an important parameter, affects the process and intensity of soil erosion and deposition, and nutrients on slopes (Zhang et al, 2021). For instance, the surface clay, soil organic content and other nutrients migrated from the upper slope positions and were then deposited in lower depression areas, especially in seriously eroded northeastern areas (Chen et al, 2022). The variations in soil erosion and sedimentation processes on slopes are regulated by different land uses and vegetation (e.g., Chen et al, 2021; Guo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of soil physicochemical properties under different land uses impacted by erosion on karst hillslopes in Southwest China

Chen,

Zhang,

2024

Earth Surf Processes Landf

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Karst hillslopes are generally characterized by different land uses. Land use and slope position impact soil erosion seriously, which in turn impacts the process of soil development and the patterns of soil properties. However, the impact of land use on soil physicochemical properties and the spatial variations and correlations between them are not fully understood on karst hillslopes. Therefore, nine sites had similar soil types, slope gradients, elevations, slope aspects and previous tillage practices were selected to conduct further research. This study was conducted to quantify the spatial distribution, variability and correlation of soil physical and chemical properties and stoichiometries as impacted by different land uses on a karst hillslope in Southwest China. Soil physical properties were significantly affected by slope position and soil depth. The soil bulk density and clay content increased with soil depth, while the opposite was true for the sand content. For the three land uses, the soil bulk density varied the most at the lower slope position, while clay and sand particles varied the most at the middle slope position. The mean spatial coefficient of variation (CV) of soil physical properties was ranked as sand (11.08%) > clay (7.77%) > bulk density (6.85%) > silt (3.81%). The mean spatial CV of soil chemical properties was ranked as available K (44.49%) > total P (16.77%) > total C (16.31%) > total N (13.09%) > available P (8.45%) > total K (7.51%). Overall, soil physicochemical properties exhibited significant spatial differences with slope location and land use on karst hillslopes. Soil chemical properties had greater spatial variation than physical properties, moreover, there were significant correlations between them. The results not only contribute to a deeper understanding of the impact of land use on the erosion process and mechanism on karst hillslopes but also provide a scientific understanding of the sustainable restoration of karst ecosystems.

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Section: Discussioncontrasting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial variability of soil physicochemical properties under different land uses impacted by erosion on karst hillslopes in Southwest China

Chen,

Zhang,

2024

Earth Surf Processes Landf

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“…In the research of Zhang et al [38], it was found that the relative content of clay in the surface layer of the slope increased along the runoff direction, but the deformation and destruction of the slope led to the decrease in the relative content of clay in sediments located at the lower part of the slope. Clay particles have large specific surface area and strong cation exchange ability, which can effectively gather stable aggregates [39], and their reduction will inevitably weaken the stability of aggregates at the lower part of the slope.…”

Section: Rainfall Effects On Soil Aggregates Stabilitymentioning

confidence: 99%

Spatial Distribution and Relationship between Slope Micro-Topography Changes and Soil Aggregate Stability under Rainfall Conditions

Zhang,

Li,

Zhu

et al. 2024

Water

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Natural rainfall affects the stability of soil aggregates by the kinetic energy of the rain changing the morphological characteristics of slope micro-topographic factors. Although the relationship between the stability of soil aggregates and micro-topography is not very significant at the slope scale, there are also rules to be found. This study aims to explore the relationship between slope micro-topography and aggregate stability, and to observe the spatial distribution of aggregate stability after water erosion. In this study, a digital elevation model of slope micro-topography was established by using a three-dimensional laser scanner to observe the slope erosion changes after rainfall events and clarify the spatial changes of soil aggregate stability and its relationship with slope micro-topography by combining geostatistics and generalized additive model (GAM). The results showed that the area of serious water erosion in the lower part of the slope accounted for 38.67% of the slope, and the micro-topography index of the slope changed obviously after rainfall, with the slope increasing by 3.1%, the surface roughness increasing by 5.34%, the surface cutting degree increasing by 26.67%, and the plane curvature decreasing by 61.7%. In addition, the GAM model was used to fit the multivariate variables. The results revealed that the slope and surface roughness were the key factors affecting the stability of water-stable aggregate. The slope and surface roughness were negatively correlated with the stability of water-stable aggregates.

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“…Black soil erosion mainly refers to the black soil region in northeastern China; the black soil loses the protection of vegetation due to the high-intensity reclamation and unreasonable demands of farming by humans [ 46 ] and because rainfall intensity is high in summer [ 51 ], both of which accelerate soil erosion and then aggravate the loss of water, fertilizer, and soil, further reducing land productivity in the black soil region [ 52 , 53 ]. Meanwhile, accelerated soil erosion would aggravate floods and affect the comprehensive development and utilization of water and soil resources [ 51 , 54 , 55 , 56 , 57 ], etc. Research into purple soil mainly focuses on the soil’s physicochemical properties and soil erosion, and rainfall has a great influence on soil properties.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Short-Term Heavy Rainfall on Hydraulic Characteristics and Rill Formation in the Yuanmou Dry-Hot Valley

Luo

Ma²,

Wang³

et al. 2022

IJERPH

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Rill erosion is one of the major environmental problems in the world; it is an important factor with regard to land degradation and has a serious impact on production and daily life in the region. The widely distributed Yuanmou group stratum promotes the development of rill erosion, whereby the strong time-concentrated rainfall and the alternating arid-humid climate prepare the ground for the development of rills in soils. Therefore, a study of the processes of slope rill erosion was carried out, and a gravel-soil slope in the Yuanmou dry-hot valley was chosen to simulate short-term heavy rainfall (25 mm/h) (No. 1 plot) and moderate rainfall (15 mm/h) (No. 2 plot), to study the erosion processes of soil and the dynamic characteristics of runoff involved in erosion. The study results showed that the width of runoff was significantly different between the two plots, while the depth of runoff was not significantly different. During the rill formation process, the width of the two plots first decreased and then increased with increasing washout duration, while its depth did not change significantly. Flow was the key factor in determining the hydraulic characteristics of runoff, and it had a significant or extremely significant positive correlation with hydraulic characteristics parameters, except in the case of Fr (Froude number) (r = 0.039). The total sediment content (CS) of plot No. 1 (0.158 g/cm3) was significantly different from that of plot No. 2 (0.153 g/cm3), and both CSs in the two plots decreased with increasing washout duration. The CS had an extremely significant negative correlation with τ (runoff shear force) (r = −0.863 **) and DW-f (Darcy-Weisbach drag coefficient) (r = −0.863 **) and a significant negative correlation with Re (Reynolds number) (r = −0.735 *) in the short-term heavy rainfall experiment, while the CS had a significant positive correlation with V (velocity) (r = 0.814 *), R (hydraulic radius) (r = 0.811 *) and P (unit stream power) (r = 0.811 *) in the moderate rainfall experiment. The results of this study will help guide further examination of the processes involved in the dynamic mechanisms of rill erosion on slopes under short-term heavy rainfall conditions.

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Impact of slope position on soil erodibility indicators in rolling hill regions of northeast China

Cited by 29 publications

References 62 publications

Spatial variability of soil physicochemical properties under different land uses impacted by erosion on karst hillslopes in Southwest China

Spatial variability of soil physicochemical properties under different land uses impacted by erosion on karst hillslopes in Southwest China

Spatial Distribution and Relationship between Slope Micro-Topography Changes and Soil Aggregate Stability under Rainfall Conditions

The Influence of Short-Term Heavy Rainfall on Hydraulic Characteristics and Rill Formation in the Yuanmou Dry-Hot Valley

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