Schutz vor mechanischer Belastung

Horn, Rainer; Paul, Rainer; Simota, C.; Fleige, Heiner

doi:10.1002/9783527678495.hbbk2002006

Cited by 2 publications

(1 citation statement)

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“…The particular instability of the air-filled coarse pores is described by numerous authors (e.g., Horn et al, 2002;Panayiotopoulos et al, 2003;Håkansson, 2005;Kutilék et al, 2006). Studies which were carried out by Bruand and Cousin (1995), Richard et al (2001), and Pagliai and Vignozzi (2002) show in good agreement with own results, that pores with diameter > 10 lm are particularly affected by a decrease after compaction, while smaller pores show both, increases and decreases.…”

Section: Figurementioning

confidence: 93%

Effect of compaction on pore functions of soils in a Saalean moraine landscape in North Germany

Gebhardt

Fleige

Horn

2009

Z. Pflanzenernähr. Bodenk.

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Soil compaction and related changes of soil physical parameters are of growing importance in agricultural production. Different stresses (70, 230, 500, and 1000 kPa) were applied to undisturbed soil core samples of eight typical soils of a Saalean moraine landscape in N Germany by means of a confined compression device to determine the effect on (1) total porosity/pore-size distribution, (2) saturated hydraulic conductivity, and (3) air conductivity to assess the susceptibility towards compaction. Different deformation behaviors after exceeding the mechanical strength particularly resulted from a combination of soil characteristics like texture and initial bulk density. The saturated hydraulic conductivity, as an indicator for pore continuity, was largely affected by the volume of coarse pores (r 2 = 0.82), whereas there was no relationship between bulk density and saturated hydraulic conductivity. Since coarsely textured soils primarily possess a higher coarse-pore fraction compared to more finely textured soils, which remains at a high level even after compaction, only minor decreases of saturated hydraulic conductivity were evident. The declines in air conductivity exceeded those in hydraulic conductivity, as gas exchange in soils is, besides the connectivity of coarse pores, a function of water content, which increases after loading in dependence of susceptibility to compaction. A soil-protection strategy should be focused on more finely textured soils, as stresses of 70 kPa may already lead to a harmful compaction regarding critical values of pore functions such as saturated hydraulic conductivity or air capacity.

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Section: Figurementioning

confidence: 93%