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Sammanfattning

The soil structure near the surface of agricultural soils changes with season mainly by land management together with climatic and biological factors. Quantitative analysis of post-tillage changes in soil structure and related hydraulic properties are necessary for evaluating and improving models of soil hydrological and transport processes. The objectives of this study were to quantify changes in soil seedbed structure induced by rainfall and drainage and to estimate the eff ;ects of soil texture and SOC on these changes. We collected samples from the harrowed layer of twenty-six fine to coarse textured Swedish mineral soils. Air-dried soil was placed in cylinders (5 cm high, diameter 5 cm) and exposed to simulated rainfall (5 mm h(-1) for 4 h) and drainage (-50 cm pressure potential) cycles in the laboratory. We used X-ray tomography to quantify changes in pore networks in a thin surface layer and in the whole cylinder. Infiltration rates at-5 cm pressure potential were measured using a mini disc tension infiltrometer on replicate air-dried samples and on the samples included in the consolidation experiments at the final state. Total imaged specific pore volumes generally decreased from initial to final state and pore size distributions were shifted towards larger proportions of below image resolution pores (< 80 mu m). There was a strong positive correlation between clay content and changes (i.e. final state-initial state) in the specific volume of pores

Nyckelord

Seedbed; Consolidation; Surface sealing

Publicerad i

Soil and Tillage Research
2021, volym: 206, artikelnummer: 104849

SLU författare

Globala målen (SDG)

SDG15 Ekosystem och biologisk mångfald

UKÄ forskningsämne

Miljö- och naturvårdsvetenskap
Markvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.still.2020.104849

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/109059