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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Improved identification of sulfidic soil materials by a modified incubation method
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Improved identification of sulfidic soil materials by a modified incubation method

机译：通过改进的培养方法改进对硫化土壤物质的鉴定

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This study examines the acidification behaviour and rate of sulfidic-sulfur oxidation in the incubation method that is currently used in soil taxonomies to identify sulfidic materials, for some clayey textured soil materials. 'Sulfidic' in these taxonomies identifies that a soil material is capable of becoming extremely acidic (i.e. pH<4) as a result of oxidation of sulfide minerals contained in that soil material. As well as examining incubation slabs of acid sulfate soil materials with the standard 10 min thickness, the utility of thinner (i.e. 2 mm thick) incubation slabs of these soil materials for identification of sulfidic soil materials was also examined. The clayey soil materials in the 2 mm thick slabs exhibited more rapid sulfidic-sulfur oxidation and acidification and resulted in fewer false-negative sulfidic soil material identifications than did the use of 10 mm thick slabs. However, the rates of sulfidic-sulfur oxidation and sulfide-derived acidification within the slabs (whether 2 min or 10 mm thick) were not always rapid enough during incubation for the full expression of acidification to be evident within the maximum incubation duration of 8 weeks required by soil classification taxonomies. The results indicate the incubation method for determination of the sulfidic nature of soil materials for soil classification purposes could be improved to reduce the risk of false-negative identification by: i. allowing the use of 2 mm thick slabs, and ii. changing the maximum duration of incubation from 8 weeks to until a stable pH is reached after at least 8 weeks of incubation. (c) 2008 Published by Elsevier B.V.
机译：这项研究检查了土壤分类法中目前用于某些黏性质感土壤材料的育种方法中，其酸化行为和硫-硫氧化的速率。这些分类法中的“硫化的”表明土壤物质由于包含在土壤物质中的硫化物矿物的氧化而能够变得极酸性（即pH <4）。除了检查标准厚度为10分钟的酸性硫酸盐土壤材料的培养板外，还检查了较薄（即2 mm厚）的这些土壤材料的培养板用于鉴定硫化土壤材料的效用。与使用10 mm厚板相比，2 mm厚板中的黏性土壤材料表现出更快的硫化硫氧化和酸化作用，并导致较少的假阴性硫化物土壤材料鉴定。然而，在培养过程中，平板中的硫硫氧化和硫化物衍生的酸化速率（无论是2分钟还是10毫米厚）并不总是足够快，无法在8周的最大培养时间内完全表达酸化作用按土壤分类法要求。结果表明，可以通过以下方法改进用于确定土壤分类目的的土壤材料硫化物性质的培养方法，以降低假阴性鉴定的风险：允许使用2毫米厚的平板，以及ii。将孵育的最长持续时间从8周更改为至少孵育8周后达到稳定的pH值。 （c）2008年由Elsevier B.V.

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