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首页> 外文期刊>Moscow University Soil Science Bulletin >Transformation of Fe-Minerals in Hydromorphic Soils
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Transformation of Fe-Minerals in Hydromorphic Soils

机译：潮湿土壤中Fe矿物的转化

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Unstable Fe-minerals, which change the color of gley after the sample extraction from soil and make less pronounced the features of gleying in the dry season, are important in hydromorphic soils parallel to stable Fe-minerals conventionally detected in dried soil. Two new parameters are proposed for the additional characteristic of Fe-minerals. The first one—index I —characterizes the interaction of active Fe-minerals with colloids and is determined as I = CEC/Fe_(free), where CEC is the cation exchange capacity. The second parameter is the change in the redness of gley after drying (Δа*) according to the CIE–L*a*b* optic system. In iron-enriched reduced gley (Gr) with low I ~ 0.1 and a strong increase in Δа* (≈9) after drying, the green rust is transformed into brown lepidocrocite. During a decrease in humidity, the transformation of reduced gley into oxidized one is accompanied by a rise in Δа* (≈3) and by a change in the composition of the green rust: the transformation of fougerite into trebeurdenite (Fe-ephemer with a higher oxidation rate of iron). When oxidized gley Go with I = 2–8 dries up, a slow increase in Δа* is caused by the inhibition of crystallization of Fe-hydroxides by colloids. In the deferruginated gley (Gdf) with high I = 6–27, the absence of a rise in the red color (Δа* ≈ 0) during drying is probably related to the inactivity of Fe-phyllosilicates.
机译：不稳定的Fe-minerals，它在水土中提取后改变了狭窄的颜色，并在干燥季节中缩小的歌剧特征，在平行于干旱中常规检测到的稳定Fe-minerals的稳定Fe-minerals中很重要。提出了两种新参数，用于Fe-Minerals的额外特征。第一单索引I - CEC是I = CEC / FE_（免费）的活性Fe-Minerals的相互作用，CEC是阳离子交换能力。第二个参数是根据CIE-L * A * B *光学系统干燥（Δа*）后狭窄的变化。在富含铁的狭窄（GR）中，低于I〜0.1，干燥后Δа*（≈9）的强烈增加，将绿色锈蚀转化为棕色鳞片。在湿度的降低期间，减少狭窄到氧化的过程中的转化伴随着Δа*（≈3）的升高，并通过绿色锈的组成的变化：核心节转化为Trebeurdenite（Fe-ePhemer铁的氧化率较高）。当氧化的狭窄随着I = 2-8次干燥时，Δа*的缓慢增加是通过胶体抑制Fe-氢氧化物的结晶来引起的。在具有高I = 6-27的渗透的狭窄（GDF）中，干燥期间，在干燥期间没有升高的红色（Δа*≈0）可能与Fe-phyllosilicates的不活动有关。

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