Genesis and classification of sesquioxidic soils from volcanic rocks in sub-humid tropical highlands of Ethiopia

Abayneh, E.; Zauyah, S.; Hanafi, Mohamed; Rosenani, A. B.

doi:10.1016/j.geoderma.2006.05.006

Cited by 22 publications

(14 citation statements)

References 19 publications

(26 reference statements)

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“…The areal fraction of clay-producing lithologies was defined as the sum of the fractions of limestone (LST), limestone-marls (LSM), shales (SHA) and basalts (BAS) outcropping in the catchment, since previous studies reported that these lithologies generally produce clayey soils in the study area (e.g. Abayneh et al 2006; Van de Wauw et al 2008). …”

Section: Suspended Sediment Concentrationsmentioning

confidence: 99%

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

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Purpose The Ethiopian highlands are a fragile environment, characterized by steep slopes, intense rainfall, a sparse vegetation cover and the occurrence of flash floods. Although important efforts have been made to mitigate the ongoing soil erosion and land degradation problems, the sediment dynamics at medium-sized catchment scale (100-10,000 km²)are not fully understood. Therefore, this study aims to provide a better of sediment export processes and the importance of flash flood events in semi-arid tropical catchments. 2Methods Measuring campaigns were conducted in 10 subcatchments of the Geba, a tributary of the Tekeze, representative of the northern Ethiopian highlands. During 2 to 4 rainy seasons, the rivers were sampled for their suspended sediment concentration (SSC) and runoff discharge.Results and discussion Variations in SSC and sediment grain-size distribution indicate changes in sediment supply during the rainy season, due to the depletion of readily available sediments and the development of a vegetation cover.Also during flood events, changes in sediment supply are observed. Sediment yields (i.e. 497-6,543 t km -2 yr -1 ) are higher than suggested by previous studies and correlate with rainfall depth. The majority of sediment export occurs during a few short but intense flash floods. No clear effect of implemented soil and water conservation measures could be detected in the sediment yields of the catchments.Conclusions Sediment export rates in the Ethiopian highlands are high, are characterized by important changes in sediment supply and are mainly controlled by the occurrence and magnitude of flash flood events. Mitigation measures to reduce sediment yield at the catchment scale should therefore not only focus on the reduction of hillslope erosion rates, but also on the magnitude of these floods.

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Section: Suspended Sediment Concentrationsmentioning

confidence: 99%

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

et al. 2010

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“…Pyrophosphate-extractable aluminium is high in FLM5 topsoil horizon, with an increase in the B w horizon of POM1. An increase in Al p content with depth, despite the decrease of OC content, has been reported in other research worldwide (Vacca et al, 2003;Delvaux et al, 2004;Kleber et al, 2004;Abayneh et al, 2006;Eger and Hewitt, 2008). In an attempt to explain such findings, some authors suggest the following reasons: dispersion problems in pyrophosphate extraction depending on centrifugation and filtration (Mizota and Van Reeuwijk, 1989).…”

Section: Selective Dissolutionsmentioning

confidence: 74%

“…This such conjecture is in line with the findings of Moon and Jayawardane (2004), who showed that basalt abrasion pH decreases with weathering, together with the simultaneous reduction of alkali and alkali-earth cations, and increase of Al and Fe. NaF pH values are N10.5 for all POM1 horizons, suggesting the presence of amorphous material (Shoji and Ono, 1978;Abayneh et al, 2006).…”

Section: Chemical and Physical Propertiesmentioning

confidence: 98%

From andic non-allophanic to non-andic allophanic Inceptisols on alkaline basalt in Mediterranean climate

et al. 2009

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“…This result indicates the low degree of pedogenic evolution of these soils. In a study on the genesis of volcanic rocks in Ethiopia, Abayneh et al (2006) observed high Feo values, ferrihydrite being one of the main oxide forms.…”

Section: Total Elements and Extractable Fe Forms (Fef Fed And Feo)mentioning

confidence: 98%

Genesis of Soils Formed from Mafic Igneous Rock in the Atlantic Forest Environment

Santos

Pereira

Anjos

et al. 2016

Rev. Bras. Ciênc. Solo

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Different parent materials participate in the formation of soils in the hilly landscape of "Mar de Morros" in the Atlantic Forest environment. Those derived from mafic igneous rock (gabbro) frequently show erosion problems because of land use, which is aggravated by the mountainous relief and soil attributes. This study evaluated the main pedogenic processes of soils formed from mafic igneous rock (gabbro) in a toposequence in Pinheiral (RJ) by characterizing physical, chemical, mineralogical and micromorphological attributes. The profiles are located at different sections in the toposequence: summit (P1), shoulder (P2), backslope (P3) and footslope (P4).They were classified according to the Brazilian System of Soil Classification (SiBCS) and correlated to Soil Taxonomy. The soil morphology of profiles P2, P3 and P4 is expressed by a brownish-red color, blocky structure with high to moderate development, clay films and clay loam to clay texture, with a textural B horizon. P1 shows less development, with a shallow profile and the sequence of horizons A-C-Cr. The soils have a slightly low degree of weathering, identified by the presence of pyroxenes and feldspars in the sand fraction and montorillonite in the clay fraction; the sum of bases is from 15 to 24 cmol c kg -1 ; and cation exchange capacity (CEC) is from 12 to 22 cmol c kg -1. A significant presence of clay skins was observed in the field and was confirmed by thin section analysis, which showed features such as argillans, ferriargillans and iron nodules. The soil profile at the summit (P1) was classified as Neossolo Regolítico Órtico (Typic Udorthents), and the other profiles as Chernossolo Argilúvicos Órticos (Typic Argiudolls).

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Genesis and classification of sesquioxidic soils from volcanic rocks in sub-humid tropical highlands of Ethiopia

Cited by 22 publications

References 19 publications

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia

From andic non-allophanic to non-andic allophanic Inceptisols on alkaline basalt in Mediterranean climate

Genesis of Soils Formed from Mafic Igneous Rock in the Atlantic Forest Environment

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