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Field traffic loads on a silty farm site cause shifting and narrowing of soil pore size distribution
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.still.2024.106425
Kai Germer, Abu Zar Shafiullah, Andre Peters, Martin Kraft, Maike Weise, Lennart Rolfes, Marco Lorenz
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.still.2024.106425
Kai Germer, Abu Zar Shafiullah, Andre Peters, Martin Kraft, Maike Weise, Lennart Rolfes, Marco Lorenz
Agricultural soils are often affected by compaction due to machinery loads, which alters pore-size distribution and thus hydraulic properties. Up to date most studies on traffic and its impact on soil functions lack a detailed analysis of the effect on pore-size distribution (PSD). Our study aimed to understand how different machinery types, load levels, and moisture conditions impact the water retention curve (WRC) and PSD at various soil depths and field areas (headland or inner field). Eight field campaigns were conducted between 2016 and 2019 on a variety of sub-fields within one agricultural farm site with a clayey-silty soil. Undisturbed soil samples were collected before and after the harvest of winter wheat, silage maize, and sugar beet, and before and after digestate application. The van Genuchten model was fitted to the laboratory data, and parameters were interpreted to deduce WRC features. Additionally, the pore water pressure head at the pore-size density maximum (PSDmax ) was determined and interpreted. The parameter α responded to all types of field traffic and decreased with increased load, indicating a shift from coarser to finer pores. The parameter n generally increased due to field traffic, suggesting a narrowed pore-size distribution. The θ s parameter, associated with porosity, decreased in all trials, with the tendency of lowest values occurring after wheeling under moist conditions. Load-induced shifts in the PSDmax towards finer pores were obvious down to 50 cm depth, even with relatively low loads. Our findings indicate that the majority of vehicles utilized in conventional agricultural operations can lead to severe soil compaction.
中文翻译:
淤泥质农场场地的田间交通负荷导致土壤孔径分布的偏移和狭窄
农业土壤经常受到机械负载压实的影响,机械载荷会改变孔径分布,从而改变水力特性。迄今为止,大多数关于交通及其对土壤功能影响的研究都缺乏对孔径分布 (PSD) 影响的详细分析。我们的研究旨在了解不同的机械类型、负载水平和水分条件如何影响不同土壤深度和田地面积(岬角或内田)的保水曲线 (WRC) 和 PSD。2016 年至 2019 年期间,在一个拥有粘土粉质土壤的农业农场场地内的各种子田地进行了八次实地活动。在冬小麦、青贮玉米和甜菜收获前后以及沼渣施用前后收集未受干扰的土壤样品。将 van Genuchten 模型拟合到实验室数据,并解释参数以推断 WRC 特征。此外,确定并解释孔径密度最大值 (PSDmax) 时的孔隙水压力水头。参数α响应所有类型的田间交通,并随着负荷的增加而降低,表明孔隙从较粗向细。参数 n 通常由于现场交通而增加,表明孔径分布变窄。与孔隙率相关的 θs 参数在所有试验中均下降,在潮湿条件下旋转后出现最低值的趋势。即使在相对较低的负载下,PSDmax 向更细孔的负载诱导偏移在 50 cm 深处也很明显。我们的研究结果表明,传统农业作业中使用的大多数车辆都会导致严重的土壤压实。
更新日期:2025-01-23
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
淤泥质农场场地的田间交通负荷导致土壤孔径分布的偏移和狭窄
农业土壤经常受到机械负载压实的影响,机械载荷会改变孔径分布,从而改变水力特性。迄今为止,大多数关于交通及其对土壤功能影响的研究都缺乏对孔径分布 (PSD) 影响的详细分析。我们的研究旨在了解不同的机械类型、负载水平和水分条件如何影响不同土壤深度和田地面积(岬角或内田)的保水曲线 (WRC) 和 PSD。2016 年至 2019 年期间,在一个拥有粘土粉质土壤的农业农场场地内的各种子田地进行了八次实地活动。在冬小麦、青贮玉米和甜菜收获前后以及沼渣施用前后收集未受干扰的土壤样品。将 van Genuchten 模型拟合到实验室数据,并解释参数以推断 WRC 特征。此外,确定并解释孔径密度最大值 (PSDmax) 时的孔隙水压力水头。参数α响应所有类型的田间交通,并随着负荷的增加而降低,表明孔隙从较粗向细。参数 n 通常由于现场交通而增加,表明孔径分布变窄。与孔隙率相关的 θs 参数在所有试验中均下降,在潮湿条件下旋转后出现最低值的趋势。即使在相对较低的负载下,PSDmax 向更细孔的负载诱导偏移在 50 cm 深处也很明显。我们的研究结果表明,传统农业作业中使用的大多数车辆都会导致严重的土壤压实。