Source identification of soil elements and risk assessment of trace elements under different land uses on the Loess Plateau, China

Xiang, Zhang; She, Dongli; Wang, Guangbo; Huang, Xuan

doi:10.1007/s10653-020-00624-0

Cited by 11 publications

(3 citation statements)

References 48 publications

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“…Meanwhile, the undisturbed soil of each sample point was sampled with a cutting ring (100 cm 3 ). The longitude, latitude, and altitude of each sampling point location were measured by hand‐held GPS with a measurement error of ±5 m. The unmanned aerial vehicle (UAV) (Jingling Phantom 4 Pro version 2.0, SZ DJI Technology Co., Ltd., PRC) was used to scan the 13 sub‐watersheds in turn, and cooperate with the real‐time kinematic measuring instrument (Sinan T300 RTK, ComNav Technology Ltd., PRC) for fixed‐point verification, so as to generate orthophoto images and digital elevation map (DEM) of each sub‐watershed using AGISOFT PHOTOSCAN Pro software (Zhang, She, Wang, & Huang, 2021).…”

Section: Methodsmentioning

confidence: 99%

Quantitatively identify the factors driving loess erodibility variations after ecological restoration

et al. 2022

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The soil erodibility factor is the key index to evaluate regional potential erosion degree and predict soil erosion. Therefore, it is very meaningful to explore the response mechanism of soil erodibility to external environmental factors on the Loess Plateau after ecological restoration. In this study, three soil erodibility factors (K‐USLE, K‐shira, and K‐torri), a comprehensive soil erodibility index (CSEI), different vegetation indices, and five topographic parameters (Topo) in two typical watersheds were selected to achieve this goal. The results revealed that vegetation indices (VI), soil properties (SP), and Topo were significantly affected by regional location and land use types. Vegetation restoration can reduce soil erodibility factors, but the reduction capacity of different land use types varies greatly. SP, VI, and Topo can explain more than 70% of variances in soil erodibility. The partial least squares‐structural equation modelling (PLS‐SEM) illustrated that SP had the largest and significant direct impact on soil erodibility (standard path coefficients (SPC) were −0.935 and −0.895, respectively). Vegetation indirectly inhibited the soil erodibility of the two watersheds by improving SP (SPC were 0.228 and 0.437, respectively), while the indirect impact of Topo mainly interferes with soil erodibility by adjusting vegetation type and spatial distribution (SPC were −0.566 and −0.292, respectively). Furthermore, CSEI was significantly affected by land use, and significantly associated with soil texture, soil organic carbon (SOC), mean weight diameter (MWD), normalized green‐red difference index (NGRDI), and vegetative index (VEG) in both watersheds. The soil in the Xinshui River watershed was more vulnerable to erosion than that in the Zhujiachuan watershed. It is of great significance to explore the response mechanism of soil erodibility to multi‐scale factors to understand the impact of external environmental evolution on soil erosion and sediment yield on the Loess Plateau.

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Section: Methodsmentioning

confidence: 99%

Quantitatively identify the factors driving loess erodibility variations after ecological restoration

et al. 2022

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“…To calibrate the model, in 2018, we selected two small check dams without a sluicing gate in the Kuye River watershed, and the sediment produced by soil erosion in the dam-controlled watershed was completely intercepted by the dams. For details of these two check dams, please refer to Zhang et al (2020). Trench excavation was carried out on the dam land and divided the flood couplets to obtain the annual erosion modulus of the two dam-controlled watersheds from 2007 to 2018 (Wang, 2020).…”

Section: Model Descriptionmentioning

confidence: 99%

Identifying the effects of land use changes and check dams on sediment yield in a watershed of the Loess Plateau, China

Zhang

She

Huang

et al. 2020

Preprint

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Reforestation and check dam construction have been progressively implemented on the Loess Plateau for several decades. However, it is still unclear how the two major sediment control strategies affect soil erosion and sediment yield in a large watershed. A combination of field investigation and model simulation was employed to quantitatively identify the impacts of the two measures on soil erosion and sediment yield in the Kuye River watershed. Significant land use changes, with the conversion of arable land and bare land to vegetation cover and construction land, occurred in the study watershed from 1987 to 2016. In addition, 306 key dams were built in the watershed, with a total storage capacity of 316.64 Mm3, according to the statistical data of 2011. Hot spot analysis showed that the high-risk regions for soil erosion and sediment yield were mainly concentrated on the periphery of Shenmu County and the outlet of the watershed. The simulation results showed that the land use changes from 1987 to 2016 remarkably reduced sediment yield by 51.14% without considering the action of check dams. In the 1987 scenario, the sediment yield was reduced by 50.44% when considering the action of check dams compared with the yield that was estimated without consideration of check dams. Under the combined effect of the two factors, the sediment yield decreased by 73.91% in 2016. More attention should be paid to check dams, and corresponding measures should be taken to protect them, especially in the flood period.

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“…In China, more than 70% of coal mining activities occur in the semi-arid Loess Plateau, resulting in the destruction of its delicate ecosystem and exacerbating soil erosion and land degradation (Wang et al 2021;Zhang et al 2021). In the past 20 years, the Loess Plateau has implemented large-scale phytomanagement measures such as returning farmland to forests and grasses, arti cial afforestation and natural restoration, which have greatly alleviated the problems of soil erosion and land degradation (An et The Baiyin is an industrial resource-based city located in the western part of China's Loess Plateau, rich in mineral resources and with a large number of smelters and chemical plants (He et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Phytomanagement improves soil aggregation and ecological security near tailings

Ju¹,

Liu²,

Fan³

et al. 2023

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Aims Revegetation is an effective measure to improve soil structure and nutrients in erosion-prone areas. However, little is known about the impact of diverse phytomanagement of revegetation on soil quality and ecological security near tailings.Methods We investigated the water-stability and soil aggregate nutrients and assessed the associated risk of heavy metal contamination under multiple phytomanagement (natural grassland, artificial forest, and artificial forest mixed with shrubs and herbs) near abandoned tailings on the Loess Plateau, comparing with the adjacent bare land.Results The results showed that phytomanagement significantly enhanced soil aggregate stability, as demonstrated by the rise in soil macro-aggregate proportion (> 0.25 mm, 10.5–22.4%) and geometric mean diameter (16.3–44.0%). Furthermore, the soil organic carbon content (SOC), glomalin-related soil protein (GRSP), aromatic-C, and alkene-C in macro-aggregates increased alongside aggregate stability enhancement. The increased stability of soil aggregates following phytomanagement could reduce the risk of heavy metal leaching, but the increased concentration of heavy metals in the aggregates. In addition, the management of artificial forests mixed with shrubs and herbs greatly reduced the ecological risk of heavy metal pollution compared to other phytomanagement. SOC and GRSP were identified as key factors influencing the risk of heavy metal contamination in soil aggregates following phytomanagement.Conclusion Our study highlights that revegetation of tailings improves soil quality and ecological security by increasing the stability of soil structure as well as SOC and GRSP within the aggregates. Artificial forests mixed with shrubs and herbs could be an optimal phytomanagement to achieve environmental sustainability in tailings areas.

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Source identification of soil elements and risk assessment of trace elements under different land uses on the Loess Plateau, China

Cited by 11 publications

References 48 publications

Quantitatively identify the factors driving loess erodibility variations after ecological restoration

Quantitatively identify the factors driving loess erodibility variations after ecological restoration

Identifying the effects of land use changes and check dams on sediment yield in a watershed of the Loess Plateau, China

Phytomanagement improves soil aggregation and ecological security near tailings

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