{"title":"地形对小流域土壤有机碳组分、团聚体稳定性和疏水性相互作用的影响","authors":"Filipe Behrends Kraemer , Guadalupe Ares , Joaquín Mozo , Celio Chagas","doi":"10.1016/j.catena.2025.109182","DOIUrl":null,"url":null,"abstract":"<div><div>Soil erosion is one of the main environmental problems worldwide and even though there were many efforts in the scientific community to understand soil erosion drivers, the complexity of positive and negative feedbacks and thresholds of these drivers on the extent of soil erosion still requires further research. This study examines the influence of terrain attributes (Position: Shoulder, Back-slope, and Foot-slope), Sub-Position (Ridge and Valley), and Transect – summarizing shape, slope, and length – on the interplay between soil organic carbon fractions (SOC) −total, labile and very labile-, aggregate stability mechanisms (AS) by Le Bissonnais method, and soil water repellency (SWR) by water-drop penetration time, highlighted as important soil erosion drivers, within a no-tillage agricultural watershed. AS was predominantly stable, as assessed by micro-cracking (∼3.4 ± 0.10 mm MWD) and mechanical breakdown tests (3.2 ± 0.12 mm MWD) mainly due to high SOC content (mean total SOC: 3.5 % ±0.59 g kg<sup>−1</sup>). Slaking tests (2.4 mm ± 0.58 mm MWD) revealed vulnerability in some areas, particularly influenced by terrain attributes and soil water repellency. SWR, categorized as slightly repellent (16.2 s ± 19.4), was positively correlated with slaking test showing a threshold where SWR increases no longer affected the slaking process. Slope position and shape, had significant effects on soil properties, especially on AS and SWR. In general Back-slope showed the lowest SOC and AS values, while the Foot-slope showed the opposite behavior. Valley showed low AS and SWR. Slope steepness and concavity affected SWR and SOC distribution probably due to its influence on soil water content. This study highlights the complex interplay between terrain attributes and soil properties, registering also thresholds between AS and SWR indirectly modulated by soil moisture. The magnitude of each soil property determined, among other factors by terrain attributes, plays a crucial role in soil erosion dynamics in agricultural landscapes.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109182"},"PeriodicalIF":5.7000,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Topographical effects on the interplay between soil organic carbon fractions, aggregate stability and water repellency at a small watershed scale\",\"authors\":\"Filipe Behrends Kraemer , Guadalupe Ares , Joaquín Mozo , Celio Chagas\",\"doi\":\"10.1016/j.catena.2025.109182\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Soil erosion is one of the main environmental problems worldwide and even though there were many efforts in the scientific community to understand soil erosion drivers, the complexity of positive and negative feedbacks and thresholds of these drivers on the extent of soil erosion still requires further research. This study examines the influence of terrain attributes (Position: Shoulder, Back-slope, and Foot-slope), Sub-Position (Ridge and Valley), and Transect – summarizing shape, slope, and length – on the interplay between soil organic carbon fractions (SOC) −total, labile and very labile-, aggregate stability mechanisms (AS) by Le Bissonnais method, and soil water repellency (SWR) by water-drop penetration time, highlighted as important soil erosion drivers, within a no-tillage agricultural watershed. AS was predominantly stable, as assessed by micro-cracking (∼3.4 ± 0.10 mm MWD) and mechanical breakdown tests (3.2 ± 0.12 mm MWD) mainly due to high SOC content (mean total SOC: 3.5 % ±0.59 g kg<sup>−1</sup>). Slaking tests (2.4 mm ± 0.58 mm MWD) revealed vulnerability in some areas, particularly influenced by terrain attributes and soil water repellency. SWR, categorized as slightly repellent (16.2 s ± 19.4), was positively correlated with slaking test showing a threshold where SWR increases no longer affected the slaking process. Slope position and shape, had significant effects on soil properties, especially on AS and SWR. In general Back-slope showed the lowest SOC and AS values, while the Foot-slope showed the opposite behavior. Valley showed low AS and SWR. Slope steepness and concavity affected SWR and SOC distribution probably due to its influence on soil water content. This study highlights the complex interplay between terrain attributes and soil properties, registering also thresholds between AS and SWR indirectly modulated by soil moisture. 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引用次数: 0
摘要
土壤侵蚀是世界范围内的主要环境问题之一,尽管科学界在了解土壤侵蚀驱动因素方面做了很多努力,但这些驱动因素对土壤侵蚀程度的正反馈和负反馈的复杂性以及阈值仍有待进一步研究。本研究考察地形属性的影响(位置:肩坡、后坡和脚坡)、子位置(山脊和山谷)和样带-总结形状、坡度和长度-土壤有机碳组分(SOC) -总、不稳定和非常不稳定-、Le Bissonnais方法的团聚稳定性机制(AS)和通过水滴渗透时间的土壤拒水性(SWR)之间的相互作用,强调了作为重要的土壤侵蚀驱动因素,在免耕农业流域。通过微破裂(~ 3.4±0.10 mm MWD)和机械击穿测试(3.2±0.12 mm MWD)评估,AS主要是稳定的,这主要是由于高SOC含量(平均总SOC: 3.5%±0.59 g kg - 1)。溶蚀试验(2.4 mm±0.58 mm MWD)显示,某些地区易受地形属性和土壤拒水性的影响。SWR为轻度驱避(16.2 s±19.4),与蜕化试验呈正相关,表明SWR的增加不再影响蜕化过程。坡位和坡形对土壤性质有显著影响,尤其是对AS和SWR的影响。总的来说,后坡的土壤有机碳和有机碳含量最低,而下坡则相反。山谷表现出较低的AS和SWR。坡度和坡度对土壤含水量的影响可能是影响土壤有机碳分布的主要原因。该研究强调了地形属性和土壤属性之间复杂的相互作用,并记录了土壤湿度间接调节的AS和SWR之间的阈值。除其他因素外,由地形属性决定的每种土壤性质的大小在农业景观的土壤侵蚀动态中起着至关重要的作用。
Topographical effects on the interplay between soil organic carbon fractions, aggregate stability and water repellency at a small watershed scale
Soil erosion is one of the main environmental problems worldwide and even though there were many efforts in the scientific community to understand soil erosion drivers, the complexity of positive and negative feedbacks and thresholds of these drivers on the extent of soil erosion still requires further research. This study examines the influence of terrain attributes (Position: Shoulder, Back-slope, and Foot-slope), Sub-Position (Ridge and Valley), and Transect – summarizing shape, slope, and length – on the interplay between soil organic carbon fractions (SOC) −total, labile and very labile-, aggregate stability mechanisms (AS) by Le Bissonnais method, and soil water repellency (SWR) by water-drop penetration time, highlighted as important soil erosion drivers, within a no-tillage agricultural watershed. AS was predominantly stable, as assessed by micro-cracking (∼3.4 ± 0.10 mm MWD) and mechanical breakdown tests (3.2 ± 0.12 mm MWD) mainly due to high SOC content (mean total SOC: 3.5 % ±0.59 g kg−1). Slaking tests (2.4 mm ± 0.58 mm MWD) revealed vulnerability in some areas, particularly influenced by terrain attributes and soil water repellency. SWR, categorized as slightly repellent (16.2 s ± 19.4), was positively correlated with slaking test showing a threshold where SWR increases no longer affected the slaking process. Slope position and shape, had significant effects on soil properties, especially on AS and SWR. In general Back-slope showed the lowest SOC and AS values, while the Foot-slope showed the opposite behavior. Valley showed low AS and SWR. Slope steepness and concavity affected SWR and SOC distribution probably due to its influence on soil water content. This study highlights the complex interplay between terrain attributes and soil properties, registering also thresholds between AS and SWR indirectly modulated by soil moisture. The magnitude of each soil property determined, among other factors by terrain attributes, plays a crucial role in soil erosion dynamics in agricultural landscapes.
期刊介绍:
Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment.
Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.