Tensile and erosive strength of soil macro-aggregates from soils under different management system

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Title:Tensile and erosive strength of soil macro-aggregates from soils under different management system
Creators:
Urbanek, Emilia; e dot urbanek at swansea dot ac dot uk; Royal Society Research Fellow, Swansea University, College of Science, Department of Geography, Singleton Park, Swansea, UK.
Horn, Rainer; Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University of Kiel, Kiel, Germany.
Smucker, Alwin J.M.; Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University of Kiel, Kiel, Germany.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 62, 4, p. 333
Uncontrolled Keywords:tensile strength, erosive strength, exterior/interior aggregate region, aggregate, concentric layers, dry aggregate stability, reduced tillage

Abstract

Reduced soil tillage practices are claimed to improve soil health, fertility and productivity through improved soil structure and higher soil organic matter contents. This study compares soil structure stability of soil aggregates under three different tillage practices: conventional, reduced and no tillage. The erosive strength of soil aggregates has been determined using the abrasion technique with the soil aggregate erosion chambers (SAE). During abrasion soil aggregates have been separated into the exterior, transitional and interior regions. The forces needed to remove the material from the aggregate were calculated as erosive strength and compared with the tensile strength of the aggregates derived from crushing tests. The relationship between aggregate strength and other soil properties such as organic carbon and hydrophobic groups’ content has also been identified. The results show that erosive and tensile strength of soil aggregates is very low in topsoil under conventional and reduced tillage comparing with the subsoil horizons. Negative correlation was found between the content of organic carbon, hydrophobic compounds and erosive aggregate strength which suggests that the stabilising effect of soils organic carbon may be lost with drying. The positive relationship between the tensile strength and erosive strength for aggregates of 8–5 mm size suggests that the total strength of these aggregates is controlled by the sum of strength of all concentric layers.

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Title:Tensile and erosive strength of soil macro-aggregates from soils under different management system
Translated title:Tensile and erosive strength of soil macro-aggregates from soils under different management system
Creators:
Urbanek, Emilia; e dot urbanek at swansea dot ac dot uk; Royal Society Research Fellow, Swansea University, College of Science, Department of Geography, Singleton Park, Swansea, UK.
Horn, Rainer; Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University of Kiel, Kiel, Germany.
Smucker, Alwin J.M.; Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University of Kiel, Kiel, Germany.
Uncontrolled Keywords:tensile strength, erosive strength, exterior/interior aggregate region, aggregate, concentric layers, dry aggregate stability, reduced tillage
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:62
Number:4
Page Range:p. 333
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8355
Item Type:Article
Deposited On:08 Jan 2015 18:41
Last Modified:08 Jan 2015 17:41

Citation

Urbanek, Emilia; Horn, Rainer; Smucker, Alwin J.M. (2014) Tensile and erosive strength of soil macro-aggregates from soils under different management system. Journal of Hydrology and Hydromechanics, 62 (4). p. 333. ISSN 0042-790X

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