Features of soil redistribution and major element migration in a karst hillslope of Southwest China

Song, Changshun; Ji, Hongbing; Beckford, Howard Omar; Chu, Hongjun; Zhang, Kun; Wang, Shi-jie

doi:10.1007/s11629-017-4791-3

Cited by 6 publications

(5 citation statements)

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“…In the US even though there is some mobilisation of soil particles and of the associated elements, a more dense vegetation cover attenuates soil movement. Our findings agree with Song et al (2018), who identified soil deposition areas at the shoulder of karst hillslope due to good vegetation cover, concluding that good vegetation coverage leads to lower velocity and flux of surface runoff, which reduces soil erosion on a karstic hillslope. Cerdá (1999) also found a significant reduction of runoff and erosion by the vegetation on marl soils but negligible on soils derived from sandstone and intermediate on clay and limestone, confirming that vegetation enhanced infiltration and reduced surface runoff and erosion, evidencing the strong control of parent material.…”

Section: Discussionsupporting

confidence: 92%

“…In addition, greater surfaces occupied by cultivated fields in LS along with higher 137 Cs soil redistribution rates than in the US suggest that a higher lateral redistribution of soil particles alongside the lower section can lead to an overall increase of the mobilisation of elements downslope. Recent studies (Liu et al, 2019) have demonstrated the impact of agricultural practices on the erosion-induced lateral transport of trace and major elements in karst regions in China, while Song et al (2018) concluded that the migration of soil elements was strongly correlated with soil erosion and deposition estimated by using fallout 137 Cs.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies suggest (e.g., Song et al, 2018) that due to the great impact of soil loss on environmental conservation and agricultural production, we urgently need to obtain information on the distribution of soil erosion/sedimentation and the migration of soil elements caused by soil redistribution. However, only a few studies have focused on investigating elemental mobilisation relative to soil redistribution.…”

Section: Introductionmentioning

confidence: 99%

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Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

2020

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

2020

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“…While soil erosion is usually greatest in the shoulder, followed by the backslope and lowest in the footslope (Song et al, 2018),…”

Section: Discussionmentioning

confidence: 99%

Evaluating soil erosion and sediment deposition rates by the <sup>137</sup>Cs fingerprinting technique at karst gabin basin in Yunnan Province, southwest China

Jiang

Chen

et al. 2020

Preprint

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Abstract. Soil erosion is a global environmental problem that can lead to the loss of nutrients in topsoil layers, particularly in fragile karst environments where the low contents of organic carbon and steep slopes used to be key pedological and geomorphological factors. Researching the erosion and deposition rates in small watersheds is important for designing efficient soil and water conservation measures. In this research, the Dapotou closed catchment, a representative depression in karst gabin basin, located in the Yunnan province, Southwest China, was selected to assess the variation of soil erosion and soil sediment mobilisation at different hillslope positions using the 137Cs tracing technique. The results showed that the soil erosion rates in the shoulders, backslopes and footslopes were 0.87, 0.35 and 0.49 cm a−1, respectively, meanwhile the soil sediment rate in depression bottom was 2.65 cm a−1. The average annual soil erosion modulus of the complete hillslope was 632 t km−2 a−1, which confirmed in the serious gradation according to karst soil erosion standards. The soil deposition modulus reached up to 3180 t km−2 a−1. The sediment delivery ratio summarized 0.82 in the whole catchment according to the square of hillslope and depression bottom. To identify which factor could play the most important role, a Principal Component Analysis was conducted. The results showed 137Cs concentration of different soil depth at different hillslope positions were significant correlated with soil organic matter (SOM) and total nitrogen (TN) (P

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“…We developed geochemical-dynamics-based moving-boundary models for the special rainfall and soil erosion characteristics of the karst region in southwest China and carried out preliminary application and verification in Zunyi [10]. In addition, we have used this method to conduct quantitative studies of soil erosion and chemical weathering in other areas of the karst slope in southwest China [11,12]. The chemical erosion rate is currently estimated based on the corrosion rate of carbonate rocks according to the statistics of a single profile or multiple profiles [13].…”

Section: Introductionmentioning

confidence: 99%

The Combined Use of 137Cs Measurements and Zr-Methods for Estimating Soil Erosion and Weathering in Karst Areas of Southwestern China

Yin

et al. 2022

Sustainability

Self Cite

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Soil physical erosion and chemical weathering quantification at the slope scale are important to reveal the material cycle of the ecosystem in the karst region, because of the high heterogeneity due to the complex habitats. The Zr-based mass balance method has been widely used to quantify long-term physical erosion and chemical weathering at the slope scale, but the method is still in the exploratory research stage for quantifying short-term physical erosion and chemical weathering. In this paper, sloping fields (nine sampling sites and two sloping fields) in Zunyi, within the Guizhou karst region, were studied. We attempted to quantify the short-term physical erosion and chemical weathering rates by 137Cs combined with the Zr-based mass balance method, and an ideal distribution curve of the Zr concentration in the soil surface layer of a karst region is proposed. The results showed the following: (1) The average soil erosion rate on the slope of the study area is 580 t/(km2·a), which is equivalent to 14% of the average value of the Wujiang River basin in which it is located. This shows that the spatial distribution of soil erosion in this area varies significantly. (2) The Zr concentration in the erosion profile (EUC (1)) corresponds to 48% of that in the deposition profile (DUC (3)). This indicates that physical erosion in the study area survives chemical weathering, which is also consistent with the relationship model hypothesis. In addition, the vertical distribution characteristics of Zr concentration in all profiles are basically consistent with the ideal hypothesis curve. (3) The chemical weathering rate of the topsoil has been preliminarily estimated to be around 30 t/(km2·a), and the ratio between the physical soil erosion and chemical weathering is 20:1. The results show that the physical erosion is dominant over the chemical weathering of topsoil, and the chemical weathering rate was proportional to the physical erosion. This study provides a new method for quantifying short-term soil erosion and weathering erosion at the slope scale in karst regions, which is important for regional ecological restoration and sustainable development.

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Features of soil redistribution and major element migration in a karst hillslope of Southwest China

Cited by 6 publications

References 61 publications

Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

Evaluating soil erosion and sediment deposition rates by the <sup>137</sup>Cs fingerprinting technique at karst gabin basin in Yunnan Province, southwest China

The Combined Use of 137Cs Measurements and Zr-Methods for Estimating Soil Erosion and Weathering in Karst Areas of Southwestern China

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Features of soil redistribution and major element migration in a karst hillslope of Southwest China

Cited by 6 publications

References 61 publications

Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

Elemental mobilisation by sheet erosion affected by soil organic carbon and water fluxes along a radiotraced soil catena with two contrasting parent materials

Evaluating soil erosion and sediment deposition rates by the &lt;sup&gt;137&lt;/sup&gt;Cs fingerprinting technique at karst gabin basin in Yunnan Province, southwest China

The Combined Use of 137Cs Measurements and Zr-Methods for Estimating Soil Erosion and Weathering in Karst Areas of Southwestern China

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Evaluating soil erosion and sediment deposition rates by the <sup>137</sup>Cs fingerprinting technique at karst gabin basin in Yunnan Province, southwest China