Erosion intensity and check dam size affect the horizontal and vertical distribution of soil particles, carbon and nitrogen: Evidence from China’s Loess Plateau

Qin, Xin; Zhu, Hansong; Ren, Yongqing; Cao, Zhimian; Wang, Xiang; Zhao, Zhongna; Yao, Yufei; Zhong, Zekun; Kong, Weibo; Qiu, Quan; Jia, Hongtao; Wei, Xiaorong

doi:10.1016/j.catena.2022.106451

Cited by 7 publications

(3 citation statements)

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“…The stabilising effect of clay is known (Wang et al 2022), while, in this case, the given correlation rather indicates a mechanism https://doi.org/10.17221/3/2024-SWR of physical stabilisation of labile forms of OC, as the higher content of labile carbon and higher lability of OC were at a higher clay content and a lower proportion of silt fraction. Qin et al (2022) found out the greater impact of silt than clay on the OC stabilisation, which is consistent with our results, indicating that a higher amount of chemically stabilised OC is thus bound in silt. In the case of the ER, the intensity of the soil profile washing is higher, therefore the correlation with water-extractable fractions at a depth of up to 0.1 m was not recorded (Table 2).…”

Section: Resultssupporting

confidence: 92%

“…Clay and the OC play a key role in improving the soil erosion resistance. In relation to the OC distribution, the silt content is often more important than the clay content (Qin et al 2022). In general, the proportions of sand and clay influence the cohesion of a soil (Wei et al 2015), which is an important factor in the case of the soil's mechanical properties.…”

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confidence: 99%

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Soil organic carbon and its labile fractions in the conditions of water erosion on arable land of Chernozems area

Balontayová,

Petlušová,

Petluš

et al. 2024

Soil & Water Res.

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Water erosion is associated with soil degradation, mainly with the removal of soil particles, their downstream transport as runoff, and, at the end, the accumulation of the carried material in new sites (Polykretis et al. 2023). Humic horizons are reduced and often already removed, and transported material, rich in an organic carbon (OC), covers an original topsoil in the concave sites, resulting in the change of landscape structure (Zádorová & Penížek 2018;Juřicová et al. 2022). Human activities, especially intensive agriculture in the case of Chernozems, rapidly accelerate soil erosion (Borrelli et al. 2017). The intensity of the soil particle transport is negatively correlated with the rate of infiltration, while this

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Section: Resultssupporting

confidence: 92%

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confidence: 99%

Soil organic carbon and its labile fractions in the conditions of water erosion on arable land of Chernozems area

Balontayová,

Petlušová,

Petluš

et al. 2024

Soil & Water Res.

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“…This study focuses on the Dongzhiyuan tableland, a borderline region on the easternmost edge of the Ganzu Region in Central China. Gully erosion has fragmented the entire Loess Plateau, and the Dongzhiyuan tableland is the largest remaining loess tableland in China (Huo et al 2020), and the continuous gully erosion and retreat here makes the tableland shrink year by year (Gao et al 2016;Qin et al 2022). Particularly, gully erosion has shown an increasing trend that has the sed attention of the local government (Guan et al 2021) as it is becoming a notable factor for hindering economic development the environment conservation.…”

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confidence: 99%

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

et al. 2023

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Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale ne erosion is scarce. Here, we use the sentinel-1A imagery during a rainy season, using the small baseline subset synthetic aperture radar interferometry (SBAS-InSAR) technology to calculate gully erosion for the largest loess plateau in China, the Dongzhiyuan tableland. The results showed that the average and cumulative subsidence rates of the whole study area are 9 mm/year and 6 mm/year respectively, while the subsidence within the gullies reached 160 mm/year and 70 mm/year, which was mainly caused by rainfall and landslides formed by groundwater softening slopes. In addition, erosion was more severe at the bottom of the gully closer to the lower reaches of the watershed, which may be related to the concentrated runoff downstream during rainfall. Interestingly, the erosion deformation was more intense on slopes 20m above the gully bottom caused by groundwater seepage. The results demonstrated the reliable capability of the SBAS-InSAR method in accurately assessing large-scale erosion deformation. IntroductionGully erosion is the low subsidence or sudden sinking of land around a gully due to natural processes (Valentin et al. 2005). It is one of the most dangerous geological hazards (Di Stefano and Ferro 2011) and has signi cant environmental adverse effects (Jin et al. 2021). Furthermore, it increases the likelihood of other geological phenomena like debris ows, and landslides, which can lead to casualties and economic loss, particularly amongst the most vulnerable (Guan et al. 2021;Guo et al. 2021;Jiang et al. 2021b).Interest in gully erosion has increased recently (Garcia-Ruiz 2010) as new tools have been developed for their assessment, such as Global Positioning System (GPS), Unmanned Aerial Vehicle (UAV), and Automated-ground-surveying (Conforti et al. 2011;d'Oleire-Oltmanns et al. 2012;Wu and Cheng 2005). However, these tools allow for only discrete, and relatively sparse measurements in small areas, obtained at high costs that compound with time. Another option is considering Light Detection and Ranging (LIDAR) (Castillo et al. 2012), which is more accurate and can be done quickly, but usually, it is done on a small scale. It places the sensor at a distance that spans usually less than a kilometer from the target resulting in limiting the scale of the assessment. This is a critical shortcoming as gully erosion can be conditioned by processes at the mesoscale (Haregeweyn et al. 2017) making studies at local instances of limited impact. Rather it is critical to monitor deformation in the vicinities of gullies in wide areas (960km 2 ). Synthetic Aperture Radar (SAR) Satellite Images are better suited for area-wide gully erosion assessments. They can be sourced free of charge; there is no need to deploy sensors on the eld; they are available at a relatively high spatial resolution (pixel values ranging between 40 and 80m for the Sentinel Constellation deployed by...

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An integrated method for extracting channel network with check dams from high‐resolution DEM on the Loess Plateau

Fan,

Zhang,

et al. 2024

Earth Surf Processes Landf

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Channel networks have been widely used to model sediment transport and accumulation. Extracting channel networks in the check dam region from digital elevation models on the Loess Plateau can facilitate effective decision‐making and planning for soil and water conservation. Three methods are generally used to ensure the continuity of channel networks by removing check dams as hydrological barriers: filtering, filling and breaching. However, these methods may still cause disruption and displacement of the channel network owing to the existence of check dams. This study presents the development of an integrated method (improved regional growth and linear feature detection [iRG‐LFD]) for extracting natural continuous channel networks and locating check dams. First, a proposed improved region growth method based on channel and check dam terrain features was used to extract the complete channel network. Subsequently, the line segment detector for extracting straight lines was then improved to separate lines with different slopes. Finally, by combining the channel network and line segment detector results, a cross model was proposed for extracting check dams of different sizes. The experimental results for the Wangmaogou and Zhoutungou catchments showed minimal errors when the proposed method was used to extract the channel network, and F1‐scores of 86.67% and 86.95% were obtained for the predicted check dam samples in the two catchments, respectively. The results indicate that this method can be effectively used to extract continuous natural channel networks and accurately identify check dams and can thus be used to design soil and water conservation measures.

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Erosion intensity and check dam size affect the horizontal and vertical distribution of soil particles, carbon and nitrogen: Evidence from China’s Loess Plateau

Cited by 7 publications

References 58 publications

Soil organic carbon and its labile fractions in the conditions of water erosion on arable land of Chernozems area

Soil organic carbon and its labile fractions in the conditions of water erosion on arable land of Chernozems area

Monitoring and evaluation of gully erosion in China's largest loess tableland based on SBAS-InSAR

An integrated method for extracting channel network with check dams from high‐resolution DEM on the Loess Plateau

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