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Iron Speciation in Organic Matter Fractions Isolated from Soils Amended with Biochar and Organic Fertilizers

机译：从生物炭和有机肥料改良过的土壤中分离出的有机物质中的铁形态

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摘要

The role and distribution of iron (Fe) species in physical soil fractions have received remarkably little attention in field-scale systems. Here, we identify and quantify the Fe phases into two fractions (fine sand, FSa, and fine silt and clay, FSi + Cl), isolated from an agricultural soil unamended and amended with different organic materials, by Fe K-edge extended Ⅹ-ray absorption fine structure (EXAFS) spectroscopy. The linear combination fitting and wavelet transform of EXAFS data revealed noticeable differences between unamended FSa and FSi + Cl fractions. Specifically, the FSi + Cl fraction was mainly characterized by ferrihydrite (48%) and Fe(Ⅲ)-soil organic matter (SOM) complexes (37%), whereas in the FSa fraction, ferrihydrite still represented a major phase (44%), with a lower contribution from Fe(Ⅲ)-SOM (18%). In the FSa fraction, the addition of the organic amendments resulted in an increase of Fe-SOM complexes (31-35%) and a decrease of ferrihydrite (28-29%). By contrast, in the amended FSi + Cl fractions, the added organic matter led to negligible changes in percent ferrihydrite. Therefore, regardless of the amendment type, the addition of organic matter to soil increased the capability of the coarse fraction (FSa) to stabilize organic carbon, thus pointing out that the role of FSa in carbon sequestration in agricultural soils at a global scale may be overlooked.
机译：铁（Fe）物种在土壤物理成分中的作用和分布在田间规模的系统中很少受到关注。在这里，我们将Fe相分为两部分（细砂，FSa，细粉土和粘土，FSi + Cl），并将其量化，并通过Fe K边扩展Ⅹ-分离自未改性并用不同有机材料改性的农业土壤。射线吸收精细结构（EXAFS）光谱。 EXAFS数据的线性组合拟合和小波变换揭示了未修正的FSa和FSi + Cl分数之间的显着差异。具体而言，FSi + Cl组分的主要特征是水铁矿（48％）和Fe（Ⅲ）-土壤有机物（SOM）配合物（37％），而在FSa组分中，水铁矿仍是主要相（44％） ，其中Fe（Ⅲ）-SOM的贡献较低（18％）。在FSa级分中，添加有机改性剂导致Fe-SOM配合物增加（31-35％），亚铁水合物减少（28-29％）。相反，在修正的FSi + Cl馏分中，添加的有机物导致亚铁水合物百分含量的变化可忽略不计。因此，无论修正类型如何，向土壤中添加有机物都会增加粗级分（FSa）稳定有机碳的能力，因此指出FSa在全球范围内农业土壤固碳中的作用可能是被忽略了。

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  • 来源
    《Environmental Science & Technology》 |2020年第8期|5093-5101|共9页
  • 作者

    Beatrice Giannetta; César Plaza; Matthew G. Siebecker; Giuliana Aquilanti; Costantino Vischetti; Jasper R. Plaisier; Miguel Juanco; Donald L. Sparks; Claudio Zaccone;

  • 作者单位

    Department of Agricultural Food and Environmental Sciences Polytechnic University of Marche 60131 Ancona Italy;

    Institute de Ciencias Agrarias Consejo Superior de Investigaciones Cientficas 28006 Madrid Spain;

    Department of Plant and Soil Science Texas Tech University Lubbock Texas 79409 United States Department of Plant and Soil Sciences University of Delaware Interdisciplinary Science and Engineering (ISE) Laboratory Newark Delaware 19716 United States;

    ELETTRA Sincrotrone Trieste S.C.p.A. 34149 Trieste Italy;

    Instituto de Ciencias Agrarias Consejo Superior de Investigaciones Cientficas 28006 Madrid Spain;

    Department of Plant and Soil Sciences University of Delaware Interdisciplinary Science and Engineering (ISE) Laboratory Newark Delaware 19716 United States;

    Department of Biotechnology University of Verona 37134 Verona Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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