In: Journal of Hydrology and Hydromechanics, vol. 62, no. 4
Emilia Urbanek - Rainer Horn - Alwin Smucker
Detaily:
Rok, strany: 2014, 324 - 333
Kľúčové slová:
Tensile strength; Erosive strength; Exterior/interior aggregate region; Aggregate; Concentric layers; Dry
aggregate stability; Reduced tillage.
URL originálneho zdroja: http://www.ih.savba.sk/jhh
O článku:
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.
Ako citovať:
ISO 690:
Urbanek, E., Horn, R., Smucker, A. 2014. Tensile and erosive strength of soil macro-aggregates from soils under
different management system. In Journal of Hydrology and Hydromechanics, vol. 62, no.4, pp. 324-333. 0042-790X (until 2019) .
APA:
Urbanek, E., Horn, R., Smucker, A. (2014). Tensile and erosive strength of soil macro-aggregates from soils under
different management system. Journal of Hydrology and Hydromechanics, 62(4), 324-333. 0042-790X (until 2019) .