Discrimination of soil magnetism enhanced by land use and its implications for inferring alterations in sediment sources and soil erosion in a homogeneous watershed: An example from the Guizhou Plateau, SW China

Zhao, Weihua; Wang, Hongya; Zhang, Zeyu; Feng, Siwen; Zheng, Yukun; Li, Shuai; Luo, Yiqi; Liu, Hongyan

doi:10.1016/j.catena.2022.106476

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Recently, karst depression deposits and isotopic dating methods were used to calculate rocky desertification‐related soil erosion rates in successive stages over past decades to centuries (Bai et al., 2010; Zhang et al., 2020). However, the divided stages could be too long to tell all the information about human impacts in the past centuries (Zhang et al., 2020), though the modern processes since the 1950s were well monitored (e.g., Wang et al., 2008; Zhao et al., 2022). Besides, the soil erosion rates failed to explain the vegetation type changes, hindering our understanding of forest evolution.…”

Section: Introductionmentioning

confidence: 99%

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Yue,

Hao,

Wang

et al. 2024

Earth's Future

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Understanding the forest evolution is vital to answering the reforestation potential in karst areas. Here, we present the first‐ever pollen record in karst depression sediment, combined with comprehensive dating methods (137Cs, 210Pbex, and 14C) and historical documents, to reveal plant change history in southwest Guangxi, a severe rocky‐desertification region. We inferred three stages of “virgin forest–deforestation–sparse tree planting” over the past three centuries. Before the 1780s, the barren mountains used to be a lush mixed broadleaf forest probably. However, maize cultivation, along with explosive population growth and migration, accelerated mountain reclamation and deforestation, leading to severe rocky desertification since the 1780s, featured by the co‐occurrence of Zea pollen appearance and Dicranopteris spore surge from 0.92% to 12.18%. Since the 1930s, sparse tree planting began, as Cupressaceae/Taxodiaceae pollen abruptly increased by 32%. Our study is significant in understanding the rocky desertification causes and guiding ecological restoration in the region.

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Section: Introductionmentioning

confidence: 99%

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Yue,

Hao,

Wang

et al. 2024

Earth's Future

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“…Watershed is the basic hydrological response unit, an ideal spatial scale for studying soil and water losses, and the fundamental unit for managing ecological environments. Studies on soil erosion at the watershed scale have focused on estimating soil erosion and sediment (Cao et al , 2022;Galdies et al , 2022;Lufira et al , 2022), assessing erosion susceptibility (Pandey et al , 2021;Tahouri et al , 2022;Tesema, 2022;Wang et al , 2022), and analyzing the factors affecting soil erosion (Aneseyeeet al , 2020;Choudhury et al , 2022;Guduru and Jilo, 2022;Zhao et al , 2022). However, most scholars chose typically representative ephemeral gullies or slopes as research objects to analyze changes in ephemeral gullies (Capra et al, 2009;Karydas and Panagos, 2020;Li et al, 2016;Wang et al 2021b;Zheng et al, 2006), but typical ephemeral gullies or slopes do not fully display changes in ephemeral gullies at a watershed scale.…”

Section: Introductionmentioning

confidence: 99%

Evolution and Development of Ephemeral Gully Erosion in Hilly and Gully Region of the Loess Plateau in China

Liu

Zhang

Yin

et al. 2023

Preprint

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Ephemeral gully erosion is a primary mode of soil erosion that is highly visible, affecting soil productivity and restricting land use. Watershed is the basic unit of soil erosion control; existing research has focused on several typical ephemeral gullies or slopes, which do not fully display changes in ephemeral gullies at a watershed scale. This study analyzed the spatial-temporal evolution and development rate of ephemeral gully erosion at the watershed scale on the Loess Plateau from 2009 to 2021 using remote sensing images (0.5 m resolution), unmanned aerial vehicles (UAV), and field investigations. The results revealed that: (1) most ephemeral gullies occurred in southwestern parts of the watershed, with many hills and large slope gradients; (2) average growth rates of each ephemeral gully frequency, length, density, dissection degree, and width were 2.87 km y , 1.66 m y , 0.12 km km y , 0.0125% y , and 0.04 m y , respectively; (3) ephemeral gully erosion volume ( V) and length ( L) had a good power function relationship: V = 0 . 0842 L 1 . 1932 ( R 2 = 0 . 80 ) . The root mean square error (RMSE) and coefficient of determination (R ) between the measured and predicted ephemeral gully volumes suggest that the V–L relationship has a good predictive ability for ephemeral gully volume. Thus, the V–L model was used to evaluate the development rate of ephemeral gully erosion volume in small watersheds from 2009 to 2021, revealing an average value of 743.20 m y . This study proposed a feasible model for assessing ephemeral gully volume and volume changes at a watershed scale using high-resolution remote sensing images, providing a reference for understanding the development of ephemeral gully erosion in small watersheds over time.

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“…As a basic hydrological response unit, the watershed provides an ideal spatial scale for studying soil and water losses and is a fundamental unit for managing ecological environments. Studies on soil erosion at the watershed scale have focused on estimating soil erosion and sediment (Cao et al, 2022; Galdies et al, 2022; Lufira et al, 2022), assessing erosion susceptibility (Pandey et al, 2021; Tahouri et al, 2022; Tesema, 2022; Wang et al, 2022), and analyzing the factors affecting soil erosion (Aneseyee et al, 2020; Choudhury et al, 2022; Guduru & Jilo, 2022; Zhao et al, 2022); however, these studies often chose typical ephemeral gullies or slopes as research objects to analyze changes in ephemeral gullies (Capra et al, 2009; Karydas & Panagos, 2020; Li et al, 2016; Wang, Zhang, et al, 2021; Zheng et al, 2006), which may not fully represent the changes occurring at a watershed scale; therefore, there is a need to clarify the temporal and spatial development processes of ephemeral gullies at the watershed scale, as this can provide valuable insights for determining soil and water conservation practices and understanding the characteristics of each ephemeral gully and other geomorphologic processes related to ephemeral gully erosion.…”

Section: Introductionmentioning

confidence: 99%

Ephemeral gully development in the hilly and gully region of China's loess plateau

Liu,

Zhang,

Yin

et al. 2023

Land Degrad Dev

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Ephemeral gully erosion is a significant form of soil erosion that visibly impacts soil productivity and restricts land use. While watersheds are fundamental for controlling soil erosion, past studies have focused on individual ephemeral gully or slope types, which do not fully represent changes in ephemeral gullies at the watershed scale. This research used remote sensing images (0.5 m resolution), unmanned aerial vehicles (UAV), and field investigations to analyze the spatial–temporal evolution and development rate of ephemeral gully erosion at the watershed scale on the Loess Plateau from 2009 to 2021. Using spatial information and morphological parameters of ephemeral gullies obtained from the SegNet model, we found that: (1) ephemeral gully numbers decreased from 4495 in 1999 to 2312 in 2021 due to improved vegetation coverage; (2) average growth rates of ephemeral gully frequency, length, density, dissection degree, and width were 2.87 km−2 year−1, 1.66 m year−1, 0.12 km km−2 year−1, 0.01% year−1, and 0.04 m year−1, respectively; (3) ephemeral gully erosion volume (V) and length (L) had a good power function relationship: . The root‐mean‐square error (RMSE) and coefficient of determination (R2) between measured and predicted ephemeral gully volumes indicated that the V–L relationship has a good predictive ability for ephemeral gully volume; thus, the V–L model was used to evaluate the development rate of ephemeral gully erosion volume in small watersheds from 2009 to 2021, revealing an average value of 743.20 m3 year−1. This study presents an empirical model for assessing ephemeral gully volume and volume changes at a watershed scale using high‐resolution remote sensing images, providing a reference for understanding the development of ephemeral gully erosion in small watersheds over time.

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Discrimination of soil magnetism enhanced by land use and its implications for inferring alterations in sediment sources and soil erosion in a homogeneous watershed: An example from the Guizhou Plateau, SW China

Cited by 4 publications

References 52 publications

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Maize Cultivation Three Hundred Years Ago Triggered Severe Rocky Desertification in Southwest China

Evolution and Development of Ephemeral Gully Erosion in Hilly and Gully Region of the Loess Plateau in China

Ephemeral gully development in the hilly and gully region of China's loess plateau

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