Transmission of vertical stress in a real soil profile. Part I: Site description, evaluation of the Söhne model, and the effect of topsoil tillage

Lamandé, Mathieu; Schjønning, Per

doi:10.1016/j.still.2011.05.004

Cited by 42 publications

(14 citation statements)

References 33 publications

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“…A sobreposição de passadas das máquinas agravou os impactos causados sobre o solo, devido ao acúmulo de cargas aplicadas sobre sua superfície ter sido distribuído ao longo do perfil, em função das tensões e das deformações resultantes. Estas tiveram maior ou menor intensidade, conforme as características físicomecânicas do solo, resultando em alterações em profundidade no perfil do solo, bem como horizontalmente, devido às tensões cisalhantes (HORN et al, 2007;SCHJØNNING, 2011a;SCHJØNNING, 2011b;REICHERT et al, 2010).…”

Section: Resultsunclassified

Compactação De Um Cambissolo Causada Por Máquinas De Colheita Florestal Espacializada Com Geoestatística

Sampietro¹,

Lopes

2016

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Este trabalho objetivou avaliar o impacto e a extensão em que Resistência à Penetração (RP) de um Cambissolo Húmico é afetada pelo tráfego de máquinas de colheita da madeira em povoamentos de Pinus taeda, utilizando métodos geoestatísticos. O estudo foi conduzido em áreas de uma empresa florestal localizada em Santa Catarina. Os tratamentos avaliados advieram da simulação de diferentes intensidades de tráfego. Foram realizadas leituras de RP nas trilhas de passagem dos rodados das máquinas e transversalmente em intervalos de 0,25 até 1,00 m e entre rodados, perfazendo uma malha de 5 x 20 m, sendo 55 pontos por tratamento e 330 no total, com dados obtidos em intervalos de 0,01 m até 0,80 m de profundidade. Os dados foram avaliados por estatística descritiva e ajustaram-se modelos de semivariogramas para análise da dependência espacial e posterior realização de krigagem ordinária. Houve grande amplitude e variação da RP e predominância de ajuste de semivariogramas do tipo gaussiano, com forte grau de dependência espacial, de 0,774 a 0,929, e alcance variando de 0,83 a 2,12 m. Os métodos geoestatísticos permitiram determinar a extensão dos efeitos do tráfego, podendo servir de subsídio para melhoria no manejo do solo e planejamento das operações florestais.

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Section: Resultsunclassified

Compactação De Um Cambissolo Causada Por Máquinas De Colheita Florestal Espacializada Com Geoestatística

Sampietro¹,

Lopes

2016

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“…However, Trautner () found a larger stress attenuation in recently tilled soils, which would suggest a smaller v in ploughed systems. Lamandé & Schjønning () observed no significant difference in stress propagation between a recently tilled soil and soil that was not tilled for about 1.5 yr. The contradictory results show that there is no general agreement as to how soil structure impacts stress transmission (see also Keller et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Seasonal dynamics in wheel load‐carrying capacity of a loam soil in the Swiss Plateau

Gut

Chervet²,

Stettler

et al. 2014

Soil Use and Management

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Subsoil compaction is a major problem in modern agriculture caused by the intensification of agricultural production and the increase in weight of agricultural machinery. Compaction in the subsoil is highly persistent and leads to deterioration of soil functions. Wheel load‐carrying capacity (WLCC) is defined as the maximum wheel load for a specific tyre and inflation pressure that does not result in soil stress in excess of soil strength. The soil strength and hence WLCC is strongly influenced by soil matric potential (h). The aim of this study was to estimate the seasonal dynamics in WLCC based on in situ measurements of h, measurements of precompression stress at various h and simulations of soil stress. In this work, we concentrated on prevention of subsoil compaction. Calculations were made for different tyres (standard and low‐pressure top tyres) and for soil under different tillage and cropping systems (mouldboard ploughing, direct drilling, permanent grassland), and the computed WLCC was compared with real wheel loads to obtain the number of trafficable days (NTD) for various agricultural machines. Wheel load‐carrying capacity was higher for the top than the standard tyres, demonstrating the potential of tyre equipment in reducing compaction risks. The NTD varied between years and generally decreased with increasing wheel load of the machinery. The WLCC simulations presented here provide a useful and easily interpreted tool to guide the avoidance of soil compaction.

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“…Soil organic matter was measured for the upper layer only and found to be 0.03 kg kg −1 soil. The soil is described in detail by Lamandé and Schjønning (2011). The sampling location was close to soils used by Naveed et al (2016).…”

Section: Methodsmentioning

confidence: 99%

Soil pore system evaluated from gas measurements and CT images: A conceptual study using artificial, natural and 3D‐printed soil cores

Lamandé

Schjønning

Ferro

et al. 2020

European J Soil Science

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Combining digital imaging, physical models and laboratory measurements is a step further towards a better understanding of the complex relationships between the soil pore system and soil functions. Eight natural 100‐cm3 soil cores were sampled in a cultivated Stagnic Luvisol from the topsoil and subsoil, which we assumed had contrasting pore systems. Artificial 100‐cm3 cores were produced from plastic or from autoclaved aerated concrete (AAC). Eight vertical holes of each diameter (1.5 and 3 mm) were drilled for the plastic cylinder and for one of the two AAC cylinders. All natural and artificial cores were scanned in an X‐ray CT scanner and printed in 3D. Effective air‐filled porosity, true Darcian air permeability, apparent air permeability at a pressure gradient of 5 hPa and oxygen diffusion were measured on all cores. The active pore system characteristics differed between topsoil (sponge‐like, network of macropores of similar size) and subsoil (dominated by large vertical macropores). Active soil pore characteristics measured on a simplified pore network, that is, from artificial and printed soil cores, supported the fundamental differences in air transport by convection and diffusion observed between top‐ and subsoil. The results confirm the suitability of using the conceptual model that partitions the pore system into arterial, marginal and remote pores to describe effects of soil structure on gas transport. This study showed the high potential of using 3D‐printed soil cores to reconstruct the soil macropore network for a better understanding of soil pore functions.

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Transmission of vertical stress in a real soil profile. Part I: Site description, evaluation of the Söhne model, and the effect of topsoil tillage

Cited by 42 publications

References 33 publications

Compactação De Um Cambissolo Causada Por Máquinas De Colheita Florestal Espacializada Com Geoestatística

Compactação De Um Cambissolo Causada Por Máquinas De Colheita Florestal Espacializada Com Geoestatística

Seasonal dynamics in wheel load‐carrying capacity of a loam soil in the Swiss Plateau

Soil pore system evaluated from gas measurements and CT images: A conceptual study using artificial, natural and 3D‐printed soil cores

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