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óxidos de ferro pedogênicos em solos do estado do Acre, Brasil

机译:英亩,巴西土壤中的生物氧化铁氧化物

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摘要

Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimentary rocks of the Solim?es Formation. Twenty one samples of subsurface horizons were collected from ten soil profiles. Soil samples were analyzed by x-ray diffractometry associated to selective chemical dissolutions. Fe contents in the clay minerals (Fes), in the pedogenic iron oxides (Fed) and in the poorly crystalline oxides (Feo) were determined. The Al 3+ -substitution and the mean crystal diameter of goethite and hematite were estimated. Soils presented low contents of Fes and Fed. The Fed/Fes ratio indicated soils in the intermediate stage of weathering, with dominance of goethite, hematite and maghemite. This condition of weathering was confirmed by the higher frequency of goethites and hematite with intermediate Al 3+ -substitution. Goethites have isodimensional forms and hematite have flat plaques forms.
机译:氧化铁是环境指标和对土壤物理和化学行为的影响。该研究旨在识别并表征巴西英亩国家土壤中的生物氧化铁。从Solim oS形成的沉积岩中产生的土壤。从十个土壤剖面中收集二十一个地下视野。通过与选择性化学溶解相关的X射线衍射测定分析土壤样品。测定粘土矿物(FES)中的粘土矿物(FES)中的Fe含量和含有差的氧化物氧化物(FeO)。估计Al 3+ - 溶液和甲酸盐和赤铁矿的平均晶体直径。土壤呈现出低含量的FE和喂养。美联储/ FES比例在风化中间阶段指示土壤,具有甲磺酸盐,赤铁矿和磁性磁石的优势。通过中间体Al 3+ -SubstITIT的植物和赤铁矿的较高频率确认了风化条件。碎片具有异尺寸的形式,赤铁矿有扁平斑块形式。

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