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• W977479991 abstract "A vas es fazisai a talajban egyreszt a redoxi-folyamatok erzekeny jelzői, masreszt jelentős szerepet jatszanak a kemiai elemek geokemiai korforgalmaban. Igy nemcsak talajtani, de kornyezetvedelmi szempontbol is fontos kerdes, hogy adott kemiai elem milyen mertekben kepes mobilizalodni a kornyezeti hatasok valtozasara. Jelen dolgozat celja a vastartalom vizsgalata szekvencialis kioldassal, tovabba a kioldott frakciok es a főbb talajtulajdonsagok (kemhatas, szervesszen-tartalom, karbonattartalom, szemcseosszetetel, agyagasvanyos jelleg) es a talajkepző kőzet jellege kozotti osszefugges vizsgalata 12, a leggyakoribb hazai talajtipusokat kepviselő talajszelvenyben.Az atlagos vastartalmu (1–4% teljes vastartalom) mintak kozott jol elkulonithetők a nagyobb vastartalmu, gyengen savanyu kemhatasu erdőtalaj- es a kisebb vastartalmu, semleges–gyengen lugos kemhatasu nem erdőtalajmintak. Az előbbi mintacsoportban a vastartalom az agyagtartalommal, az utobbiban az iszaptartalommal nő, utalva a helyben keletkezett es az atoroklott vasfazisok elterő szerepere a ket csoport kozott. Az agyagtartalommal tapasztalt osszefuggesnel szerepe lehet a duzzado agyagasvanyok dominanciajanak is a vizsgalt erdőtalajmintakban.A vas megoszlasa hasonlo jelleget mutat a ket mintacsoportban. A vas tulnyomo resze (>80%) minden talajtipusban a rezidualis, zommel atoroklott frakciohoz kothető. A masodik legjelentősebb frakciot ado redukalhato vastartalom aranya az erdőtalajokban nemileg nagyobb, ami a vas-oxidok, hidroxidok formajaban tortenő felhalmozodasahoz kedvezőbb feltetelekre utal ezekben a mintakban. Ezzel szemben a szerves anyaghoz kothető, oxidalhato frakcio a jelentősebb humuszfelhalmozodast mutato nem erdőtalajokra jellemző nagyobb aranyban. A novenyek szamara potencialisan legkonnyebben felvehető vashanyadok minden talajtipusban alacsonyak, a teljes vastartalomnak csak nehany tized szazalekat adjak.A vasmegoszlas szelvenybeli eloszlasaban is megjelenik az erdőtalajok felhal-mozodasi szintjere jellemző vasdusulas szinte minden frakcioban, valamint a nem erdőtalajokra jellemző nagyobb humuszfelhalmozodashoz kapcsolodo vasdusulas. Hasonlosag is tapasztalhato a ket csoport kozott ebben a tekintetben, miszerint a szerves anyaghoz kothető es a konnyen mobilizalhato vas aranya a melyseggel csokken, utalva a szerves anyag es vas kapcsolatara. A talaj vaskeszletet nagyreszt szolgaltato talajkepző kőzet hatasa azonban nem volt kimutathato a vas megoszlasara az alkalmazott modszerrel.A talajok teljes vastartalma es megoszlasanak valtozasa a szelvenyen belul jol mutatja az egyes talajkepző folyamatok tipusat, helyet es utal a mertekere is. Eredmenyeink szerint a talaj vastartalmanak szekvencialis kioldasa fontos informaciot nyujthat ezen folyamatokrol. | Iron and its phases are not only sensitive indicators of soil redox processes, but also play an important role in the geochemical cycle of chemical elements. Studies on the mobility of this element in different soil environments are thus of utmost importance from both the pedological and environmental point of view.The aim of present paper was to study the fractionation of iron by means of sequential extraction, and the relationship between the extracted iron fractions and both major soil properties (pH, TOC, carbonate content, particle size distribution, clay mineralogy) and the nature of the soil parent material in 12 profiles characteristic of the soil types found most frequently in Hungary (humous alluvial soil, leached chernozem, humous sandy soil, typical meadow soil, pseudomyceliar (calcareous) chernozem, meadow solonetz, brown forest soil with clay illuviations, brown forest soil with carbonate residues).Sequential extraction was performed on 33 samples from the 12 profiles, each involving three parallel measurements. The samples were ground to a particle size of <10 µm in an agate mortar and extraction was carried out using the Tessier technique modified by Li et al. (1995), which consists of the following five steps: 1. ion exchange with magnesium chloride (pH=7), 2. extraction with weak acidic acid (pH=5), 3. reductive extraction with hydroxylamine hydrochloride (pH=2), 4. oxidative extraction with hydrogen peroxide (pH=2), 5. complete dissolution with a mixture of nitric acid, hydrofluoric acid and perchloric acid. The relative error arising from the parallel measurements was 33%, 21%, 1%, 17% and 3% in the five steps.The studied samples were characterized by average iron content (1–4% total iron). Forest soils with slightly acidic pH and higher iron content could be clearly distinguished from non-forest soil samples with neutral or slightly alkaline pH and lower iron content. The amount of iron increased with the clay content in the former group and with the silt content in the latter, suggesting the diverse roles of pedogenic and inherited iron phases in the different soil types. Additionally, the dominance of swelling clay minerals may play an important role in the relationship between the iron and clay content in the forest soil samples.The fractionation of iron was similar in the two soil groups. Iron could be found predominantly (>80%) in the residual, mainly inherited fraction in all the soils. The second largest fraction was that of reducible iron, which was slightly higher in the forest soil samples than in non-forest soils, suggesting that conditions favoured the accumulation of iron in the form of oxides and hydroxides in these samples. By contrast, the oxidizable (e.g. organic matter-bound) iron fraction was much higher in non-forest soil samples, which exhibited more intense humus formation. The potentially bio-available iron fraction made up a very low proportion of the total iron in both soil groups.When the iron fractionation within the soil profiles was studied, the enrichment of all the iron fractions could be observed in the accumulation horizons of the forest soil profiles, while it accumulated in the organic horizons of non-forest soil samples. One similarity between the two soil groups was that the ratio of easily mobilizable iron bound to organic matter decreased with depth, suggesting a close association between soil organic matter and iron in these soils. However, the soil parent material was found to have no effect on iron fractionation.The total iron content of the soils and changes in its distribution within the profile gave a good reflection of the type, site and extent of certain soil-forming processes. The results showed that sequential extraction of the soil iron content was an effective tool for obtaining information about these processes." @default.
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• W977479991 date "2012-01-01" @default.
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• W977479991 title "A vastartalom vizsgálata szekvenciális kioldással néhány hazai talajtípusban" @default.
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