Color change during the drying of samples of medium-loamy slightly ferruginous gley taken from a pit of alluvial swampy mucky-gley soil in the Moscow region was studied using a portable spectrophotometer in the field and at a laboratory. Despite the absence of visual differences, instrumental examination revealed particular changes in the lightness and yellowness of soil samples. Two types of dependencies were determined: at short-term field study and at long-term gley drying at the laboratory. The latter dependence of lightness or yellowness on the duration of the drying period is logistic: there are two steady states of the parameters and a transition area between them, where their values sharply increase. The slow yellowing of the studied gley puts the presence of green rust mineral into question, which is typical for higher ferruginous gley soils. Drying exerts different effects on the rate of color change in the top and deep parts of the visually uniform gley horizon. This is clearly related to its chemical (and mineralogical) differentiation.

中文翻译：

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干燥过程中冲积格利微铁质土壤的颜色变化

在野外和实验室，使用便携式分光光度计研究了从莫斯科地区冲积沼泽性泥质-gley土坑取来的中粒轻度含铁质gley样品干燥过程中的颜色变化。尽管没有视觉差异，仪器检查显示土壤样品的亮度和泛黄度发生了特定变化。确定了两种类型的依存关系：在短期的现场研究和在实验室的长期g干。后者在干燥期间的持续时间取决于亮度或黄色，这是逻辑关系：参数有两个稳态，并且在它们之间有一个过渡区域，它们的值急剧增加。研究的鸡g缓慢变黄使绿色锈蚀矿物的存在受到质疑，这对于高铁质的ley利土壤是典型的。干燥对视觉上均匀的灰度地平线顶部和深部的颜色变化速率产生不同的影响。这显然与其化学（和矿物学）差异有关。