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首页> 外文学位 >LITHOSEQUENCE AND TOPOSEQUENCE OF OXISOLS FROM GOIAS AND MINAS GERAIS STATES, BRAZIL.
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LITHOSEQUENCE AND TOPOSEQUENCE OF OXISOLS FROM GOIAS AND MINAS GERAIS STATES, BRAZIL.

机译：巴西戈亚斯州和米纳斯格拉斯州的恶臭素的岩序和拓扑序列。

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摘要

A toposequence of soils developed from basalt in the Central Plateau of Brazil (Goias State) and a pedon from the Quadrilatero Ferrifero (Minas Gerais State) were studied.;Trace elements are conserved in the solum by slow release, especially from magnetite, and by adsorption and/or incorporation into the structures of the secondary Fe oxyhydroxides.;The lithosequence study revealed that the itabirite-derived Oxisol has the following properties relative to the basalt-derived Oxisols: (1) Greater hematite content, except in the case of the basalt-derived soil in the summit position (G6), with smaller mean crystallite dimension; (2) Greater goethite content with smaller amount of Al substitution; (3) Much less gibbsite and virtual absence of kaolinite; (4) Redder moist soil color: dusky red (10R 3/4); (5) Much higher magnetic susceptibility; (6) Smaller P adsorption and larger P desorption; (7) Much lower content of all analyzed essential nutrients except Fe and P; (8) Purer magnetite (Fe(,2)('3+)Fe('2+)O(,4)), whereas the magnetite in basalt-derived soils is high in trace elements.;Thus, the effect of the parent material was still evident even in highly weathered soils, indicating the need for the separation between itabirite- and basalt-derived Oxisols in a system of soil classification. A breaking point at > 50% Fe(,2)O(,3), 15,000 x 10('-6) cgs of magnetic susceptibility, all of which reflect the original parent material, could be the differentiating characteristics. Particle density, amount of trace elements and capacity to fix phosphorus are accessory properties that are associated with the differentiating characteristics.;In the toposequence of soils derived from basalt, from upper (redder Oxisols) to lower (yellower Oxisols) slope positions the following trends were observed: (1) Hematite content decreased whereas goethite content increased; (2) The amount of Al substitution into the goethite structure increased; (3) Gibbsite content decreased whereas kaolinite content increased; (4) Moist soil color changed from dark reddish brown (2.5YR 3/4) to dark yellowish brown (10YR 4/4); (5) Magnetic susceptibility of fine clay decreased and thus maghemite content probably decreased; (6) P adsorption increased whereas P desorption decreased; (7) Mo content decreased whereas Cu, Mn, Zn, Cr, Ti, V, Co and Ni showed weak or no trends.
机译：研究了巴西中部高原地区（戈亚斯州）的玄武岩和米纳斯吉拉斯州Quadrilatero Ferrifero州的脚踏板所形成的土壤的通透性；微量元素通过缓慢释放（特别是从磁铁矿中以及通过磁铁矿）得以保存。羟基序数研究表明，与依玄武岩衍生的Oxisol相比，衍生自依abi石的Oxisol具有以下特性：（1）较高的赤铁矿含量，但玄武岩衍生的土壤处于顶峰位置（G6），平均晶粒尺寸较小； （2）针铁矿含量较高，铝取代量较少； （3）高岭石少且几乎没有高岭石； （4）较湿的土壤颜色：暗红色（10R 3/4）； （5）磁化率高得多； （6）较小的P吸附和较大的P解吸; （7）除铁和磷外，所有分析必需营养素的含量都低得多； （8）较纯的磁铁矿（Fe（，2）（'3+）Fe（'2+）O（，4）），而玄武岩衍生土壤中的磁铁矿中微量元素含量较高;即使在高度风化的土壤中，母体材料仍然很明显，这表明在土壤分类系统中需要分离依坦岩和玄武岩衍生的Oxisol。 Fe（，2）O（，3）> 15,000 x 10（'-6）cgs的磁化率> 50％时的断裂点都可以反映出原始母体材料，这可能是其区别特征。颗粒的密度，微量元素的含量和固磷的能力是与微分特征相关的辅助特性。在玄武岩土壤中，从上（红色氧化土）到下（黄色氧化土）坡度以下趋势观察结果：（1）赤铁矿含量下降而针铁矿含量上升； （2）针铁矿结构中Al的取代量增加； （3）菱铁矿含量下降而高岭石含量增加； （4）潮湿的土壤颜色从深红棕色（2.5YR 3/4）变为深黄棕色（10YR 4/4）； （5）细粘土的磁化率降低，磁赤铁矿含量可能降低； （6）磷吸附增加，而磷解吸减少； （7）Mo含量下降，而Cu，Mn，Zn，Cr，Ti，V，Co和Ni呈弱趋势或无趋势。

著录项

  • 作者

    CURI, NILTON.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Agronomy.
  • 学位 Ph.D.
  • 年度 1983
  • 页码 174 p.
  • 总页数 174
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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