Depth function of manganese (Mn) concentration in soil solutions: Hydropedological translocation of trace elements in stratified soils

Authors : Martin REİSS, Peter CHİFFLARD

Pages : 169-177

Doi:10.18393/ejss.2015.3.169-177

View : 114 | Download : 14

Publication Date : 2015-07-15

Article Type : Research Paper

Abstract :Periglacial cover beds are an important trigger of slope-water paths in sloped terrain of the mid-latitudes. Most hydropedological studies focus on the quantitative analysis about the interrelation between subsurface layering and runoff processes at the slope scale. In this research we emphasis on a qualitative environmental geochemical analysis of trace elements and dissolved organic carbon in a small forest hydrological study area in the central parts of the subdued mountains of Germany insert ignore into journalissuearticles values(Location: KrofdorferForst, +50° 41` 3.69`, +8° 38` 38.87`);. The main objective is to assess the effect of lithological discontinuities of stratified soils within the depth functions of trace elements concentration in soil solutions insert ignore into journalissuearticles values(soil water and its dissolved and mobile fraction in a vertical distribution);. Lorz insert ignore into journalissuearticles values(2008); show that depth functions of manganese insert ignore into journalissuearticles values(Mn); are characterized by strong pedogenic dynamics, analysing a shortened sequential extraction of solid soil material. We investigated the hypothesis that lithological discontinuities act like aquicludes. Therefore we expect abrupt changes within the depth function of manganese as a result of such water-blocking effect insert ignore into journalissuearticles values(= geochemical barriers); as a consequence of mobilization under wet soil conditions. In a preliminary case study we sampled soil solutions from three different plots within a 400m-toposequence. We use in situ trench installed suction lysimeters with ceramic tips insert ignore into journalissuearticles values(Irrometer Soil Solution Access Tube); to extract soil water samples each 20 cm from top- insert ignore into journalissuearticles values(10 cm); to subsoil insert ignore into journalissuearticles values(110 cm);. For geochemical element analysis we use an inductively coupled plasma mass spectrometry insert ignore into journalissuearticles values(ICP-MS);. The results: A clear character of abrupt changes within the depth function could be illustrated for most of the plots. For example, at the upper slope plot a contrast of the depth function is from 1013 ppb mean concentration at 50 cm profile depth to 290 ppb mean concentration at 70 cm profile depth insert ignore into journalissuearticles values(17 month sampling period);. To conclude, these results demonstrate that hydrochemical quality and translocation processes of soil solutions determining an interrelation between subsurface layering and run off processes - respectively could be seen as an environmental consequence of it.
Keywords : Pedohydrology, trace elements, periglacial cover beds, hillslope hydrology, geochemical barriers

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