Redoximorphic Features as Related to Soil Hydrology and Hydric Soils

Vepraskas, M. J.; Lindbo, David

doi:10.1016/b978-0-12-386941-8.00005-8

Cited by 31 publications

(26 citation statements)

References 51 publications

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“…300 to 200 ka. The mottles and concretions within these soils, together with the presence of well-developed pressure faces and slickensides in the more clay rich horizons, suggest that the soils were subject to alternating wetting-drying cycles (Pal et al, 2009;Vepraskas and Lindbo, 2012). This hydromorphic interpretation is compatible with the position of soils within a fine-grained floodplain setting where the water table is close to the surface.…”

Section: Pp Cunha Et Al / Quaternary Science Reviews XXX (2016) 1esupporting

confidence: 67%

New data on the chronology of the Vale do Forno sedimentary sequence (Lower Tejo River terrace staircase) and its relevance as a fluvial archive of the Middle Pleistocene in western Iberia

Cunha

Martins

Buylaert

et al. 2017

Quaternary Science Reviews

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a b s t r a c tThe Vale do Forno archaeological sites (Alpiarça, central Portugal) document the earliest human occupation in the Lower Tejo River, well established in geomorphological and environmental terms, within the Middle Pleistocene. In a staircase of six fluvial terraces, the Palaeolithic sites were found on the T4 terrace (þ24 m, above river bed) which is made of a basal Lower Gravels unit (LG) and an overlying Upper Sands unit (US). Geomorphological mapping, coupled with lithostratigraphy, sedimentology and luminescence dating (quartz-OSL and K-feldspar post-IRIR 290 ) were used in this study. The oldest artefacts found in the LG unit show crude bifacial forms that can be attributed to the Acheulian. In contrast, the US unit has archaeological sites stratigraphically documenting successive phases of an evolved Acheulian. Luminescence dating and correlation with the Marine Isotopic Stages suggest that the LG unit has a probable age of ca. 335 to 325 ka and the US unit an age of ca. 325 to 155 ka. This is in contrast to previous interpretations ascribing this terrace (and lithic industries) to the Last Interglacial and early phases of the Last Glacial. The VF3 site (Milhar os), containing Micoquian (Final Acheulian) industries (with fine and elaborated bifaces), found in a stratigraphic level located between the T4 terrace deposits and a colluvium associated with Late Pleistocene aeolian sands, is younger than 155 ka but much older than 32 ka.© 2016 Elsevier Ltd. All rights reserved. IntroductionUnderstanding of the Palaeolithic occupation of Northern Europe has been substantially based on evidence from rivers (e.g. Bridgland et al., 2006). For Western Europe and specifically in Iberia, insights into the Palaeolithic occupation is similarly derived from its major rivers (from north to south: Douro, Tejo/Tagus, Guadiana, Guadalquivir) (e.g. Santonja and Villa, 2006). Within this context, the Vale do Forno archaeological sites (Alpiarça, in central Portugal; Fig. 1) provide the earliest and most well documented human occupation in the Lower Tejo (the Portuguese part of the Tejo basin). Lower Palaeolithic bifacial sites are common, often well represented by lithic industries. Their local stratigraphy and technological characteristics indicate successive phases of what is commonly named as the Acheulian. However, they were chronologically poorly constrained.From the Spanish border to the Atlantic coast, the Tejo crosses major faults which provide a natural geomorphological subdivision of the river into a series of valley reaches (I to V;Cunha et al., 2005). * Corresponding author.E-mail addresses: pcunha@dct.uc.pt (P.P. Cunha), aam@uevora.pt (A.A. Martins), jabu@dtu.dk (J.-P. Buylaert), anmu@dtu.dk (A.S. Murray), 3raposos@sapo.pt (L. Raposo), paolo.mozzi@unipd.it (P. Mozzi), m.stokes@plymouth.ac.uk (M. Stokes).

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Section: Pp Cunha Et Al / Quaternary Science Reviews XXX (2016) 1esupporting

confidence: 67%

New data on the chronology of the Vale do Forno sedimentary sequence (Lower Tejo River terrace staircase) and its relevance as a fluvial archive of the Middle Pleistocene in western Iberia

Cunha

Martins

Buylaert

et al. 2017

Quaternary Science Reviews

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“…Enquanto que, nas posições mais altas, os paleodiques, a precipitação pode causar a formação de lençol suspenso. A formação de lençol suspenso e epissaturação do solo levam ao surgimento de características estágnicas (FAO, 2001;VAN BREEMEN;BUURMAN, 2002;BRADY;WEIL, 2004;BUOL et al, 2011;VEPRASKAS;LINDBO, 2012) …”

Section: Introductionunclassified

Spatial distribution of iron and manganese exchangeable wetland soils

Chig¹,

Couto²,

Beirigo³

et al. 2016

Ambiência

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ResumoO ferro (Fe) e o manganês (Mn) trocáveis estão entre os elementos mais móveis na solução do solo em ambientes redutores. No Pantanal, há vários ambientes em que os solos apresentam condições redutoras sazonais ou permanentes relacionadas aos pulsos de inundação. Dentre as principais alterações que os pulsos de inundação causam nos solos, estão as mudanças nas condições de oxirredução. O Fe e o Mn estão entre os elementos mais suscetíveis a tais alterações, que influenciam diretamente a disponibilidade desses elementos para os ciclos biogeoquímicos. O objetivo deste trabalho foi estudar a variabilidade espacial dos teores de Fe e de Mn trocáveis em três áreas com superfícies geomórficas representativas da paisagemda sub-região do pantanal de Poconé (MT). Em cada área, foi delimitada uma parcela de 6.000 m 2 , subdividida em unidades amostrais de 10 x 10 m, onde foram realizadas coletas sistemáticas de 77 amostras de solos, nas profundidades de 0 a 20 cm e de 40 a 60 cm. Nas áreas ocorrem solos das classes: LuvissoloHáplicoem um paleodique (área 1) e Gleissolo Háplicoem duas paleoplanícies (áreas 2 e 3).Os resultados indicam grande variabilidade espacial dos teores de Fe e de Mn trocáveis e dos teores de argila. A dependência espacial dos teores de Fe e de Mn trocáveis foi considerada de alta a moderada, nas duas profundidades, evidenciando os efeitos 1 Dr.; Engenheiro Agrônomo; Professor Titular

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“…Anaerobicity occurs when (1) there is organic matter present, (2) microorganisms are actively oxidising organic material, (3) the soil is saturated and (4) dissolved oxygen is removed from the pores (Vepraskas et al 2012). When one of these four conditions is not present, hydromorphic properties in soils will not form.…”

mentioning

confidence: 98%

“…As opposed to vegetation, soil morphology can therefore be used to delineate and identify wetlands whose hydrology has been altered by anthropogenic impacts (Mausbach and Richardson 1994). Hydromorphic soil properties relevant to wetland classification include the following: organic carbon (OC) accumulation (10% OC); peat layers; grey matrix colours (chroma  2); high chroma mottles in grey matrix; low chroma mottles (10%) in high chroma matrix; and oxidised root channels (Mitsch and Gosselink 1993;Vepraskas et al 1994;Vepraskas and Faulkner 2001;Vepraskas and Lindbo 2012). These morphological properties should occur within 500 mm from the surface in order for the soils to classify as wetland soils.…”

mentioning

confidence: 99%