Quantifying the impact of no‐till on sediment yield in southern Brazil at the hillslope and catchment scales

Londero, Ana Lúcia; Minella, Jean Paolo Gomes; Schneider, Fabio José Andres; Deuschle, Dinis; Merten, Gustavo Henrique; Evrard, Olivier; Boeni, Madalena

doi:10.1002/hyp.14286

Cited by 7 publications

(9 citation statements)

References 66 publications

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“…The research presented in this study concludes that both stone dike terraces and earth‐banked terraces effectively reduce soil erosion on slopes under ordinary rainfall conditions. This conclusion is consistent with previous research findings (Al‐Seekh & Mohammad, 2009; Gathagu et al, 2018; Hammad et al, 2004; Li et al, 2012; Londero et al, 2021; Pijl et al, 2020; Subhatu et al, 2018). However, when it comes to their impact on runoff generation, these conclusions diverge significantly.…”

Section: Discussionsupporting

confidence: 93%

Rainfall–runoff process and sediment yield in response to different types of terraces and their characteristics: A case study of runoff plots in Zhangjiachong watershed, China

Meng,

Zhu,

Shi

et al. 2023

Land Degrad Dev

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A field experiment was conducted in the Zhangjiachong watershed to analyze the characteristics of rainfall–runoff process and sediment yield under different types of terraces. Various runoff plots were utilized, and a two serial tank model was employed to simulate runoff generation and concentration processes, taking into account vegetation interception. A soil erosion model incorporating raindrop erosion and sheet erosion was established to replicate sediment yield and concentration process. The parameters of the rainfall–runoff model and soil erosion model were calibrated and validated using observed runoff and sediment yield data. The controlling factors on runoff and sediment yield were explored and compared. The results indicate that both calibration and validation outcomes were acceptable. The earth‐banked terraces–citrus demonstrated the largest coefficients of upper and lower surface runoff, while its upper runoff threshold of the upper tank and the runoff threshold of the lower tank were the lowest, suggesting that it was more likely to produce surface and subsurface runoff. On the other hand, the stone dike terraces–crops exhibited the smallest coefficients of upper and lower surface runoff, while its upper runoff threshold of the upper tank was the highest. The lower runoff threshold of the upper tank was the same across different types of terraces. Compared to the earth‐banked terraces, the stone dike terraces have a larger infiltration coefficient in the upper tank and a smaller infiltration coefficient in the lower tank. Sensitivity analysis indicates that the most sensitive factors affecting runoff simulation results are the runoff threshold and the infiltration coefficient of the lower tank. Terraces, whether constructed with earth banks or stone dikes, are effective in reducing soil erosion. However, during storm rainfall events, these terraces may be partially destroyed, resulting in a higher sediment yield than that of the same vegetation cover on slope land. Terraces with hedgerows have a more significant effect on reducing runoff and sediment than those without hedgerows.

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Section: Discussionsupporting

confidence: 93%

Rainfall–runoff process and sediment yield in response to different types of terraces and their characteristics: A case study of runoff plots in Zhangjiachong watershed, China

Meng,

Zhu,

Shi

et al. 2023

Land Degrad Dev

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“…From an equivalent of 360 plot yr across five Brazilian states, Fonseca et al (2021) retrieved soil losses ranging from a minimum of 8.9 to a maximum of 205.7 t ha −1 yr −1 . They also showed that soil losses under conservation agriculture experience erosion rates that are 70% lower than those measured under conventional agriculture, underlining the importance of permanent vegetation cover to reduce tillage and limit runoff and thus soil erosion (see also Anache et al, 2017Anache et al, , 2019Castro et al, 1999;Londero et al, 2021).…”

Section: Brief Review Of Natural Denudation and Human-induced Erosion...mentioning

confidence: 99%

Natural Denudation Versus Anthropogenically Accelerated Erosion in Central Brazil: A Confrontation of Time and Space Scales

et al. 2023

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Land degradation resulting from increased continental surface erosion is a worldwide and systemic phenomenon due to unsustainable human activities. Already fragile, the intertropical zone is likely to be further affected by climate change like increased aridity, an aggravating factor of soil erosion and land degradation. A major challenge is thus to provide the necessary knowledge to not only deepen our understanding of the Earth's system and its critical thresholds but also to help achieving sustainability. Understanding the factors that control the properties and processes of the critical zone, and especially what will be its responses to ongoing climate and land use changes, requires multidisciplinary efforts to tackle time scales that are compatible with morphogenesis and soil development as well as environmental disturbances of anthropogenic origin. Due to its prominent ecological importance, the Brazilian Cerrado biome is an ideal natural laboratory were to gauge the consequences of recent and intense agricultural activities on continental surface erosion. We focused on the region of Brasília where our approach allows confronting the temporal scales of long‐lived and stable cosmogenic nuclides with that of short‐lived radioactive isotopes, through a comparison of natural and anthropogenically disturbed land surfaces. Our results indicate that long‐term, background denudation rates are lower than 10 mm Kyr−1 whereas recent erosion rates due to human activities may reach rates at least 160 times higher, exceeding by far the sustainability of the soil resource.

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“…1). Detailed information on the site's characteristics and direct measurements' obtention can be found in Londero et al (2021aLondero et al ( , 2021b and Schneider (2021). Further information is presented in Tables 1 and 2 in the supplementary material.…”

Section: Soil Erosion Modelingmentioning

confidence: 99%

Terrain analysis, erosion simulations, and sediment fingerprinting: a case study assessing the erosion sensitivity of agricultural catchments in the border of the volcanic plateau of Southern Brazil

et al. 2022

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Erosion and its spatial distribution in three agricultural headwater catchments were assessed in the border of the volcanic plateau in Southern Brazil. We analyzed terrain, hydrological processes and land use influence to provide a comprehensive assessment of the catchments' sensitivity to erosion. MethodsTopographic attributes were acquired from a digital elevation map, WaterSed model was parametrized to simulate runoff, diffuse erosion and sediment yield, and sediment source contributions were estimated using sediment fingerprinting based on near-infrared spectroscopy. Results 2According to the modeled results, areas covered by crop fields, grasslands and those adjacent to the drainage network are the most sensitive to erosion. Short distances from the source to the river network and the occurrence of high magnitude rainfall events (80 mm) promoted increases in connectivity for runoff/sediment transfer. Erosion simulations show that areas of low infiltration, as unpaved roads, were important runoff generators during lower volume rainfall events (25 mm). Sediment fingerprinting provided satisfactory results to quantify the contributions of unpaved roads to sediment (~39%).Topsoil and stream channels were also significant sediment sources for the set of analyzed samples, corresponding to average contributions of 38 and 23%, respectively. ConclusionAreas sharing geomorphological similarities did not lead to similar sediment contributions. Vegetation cover controlled erosion in topographically sensitive areas.Unpaved roads provide a significant sediment source, followed by topsoil and stream channels. The complementary results provide useful insights to better coordinate planning environmental conservation strategies in these fragile landscapes.

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Quantifying the impact of no‐till on sediment yield in southern Brazil at the hillslope and catchment scales

Cited by 7 publications

References 66 publications

Rainfall–runoff process and sediment yield in response to different types of terraces and their characteristics: A case study of runoff plots in Zhangjiachong watershed, China

Rainfall–runoff process and sediment yield in response to different types of terraces and their characteristics: A case study of runoff plots in Zhangjiachong watershed, China

Natural Denudation Versus Anthropogenically Accelerated Erosion in Central Brazil: A Confrontation of Time and Space Scales

Terrain analysis, erosion simulations, and sediment fingerprinting: a case study assessing the erosion sensitivity of agricultural catchments in the border of the volcanic plateau of Southern Brazil

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