Properties and Genesis of Finer Textured Subsoil Bands in Some Sandy Michigan Soils1
Properties and Genesis of Finer Textured Subsoil Bands in Some Sandy Michigan Soils1
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密歇根州一些沙土中较细纹理的底土带的特性和成因1
DOI：
10.2136/sssaj1959.03615995002300020017x
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发表时间：
1959
影响因子：
2.9
通讯作者：
M. M. Mortland
中科院分区：
文献类型：
--
作者：
E. Wurman;E. P. Whiteside;M. M. Mortland
实地和实验室研究表明，在密歇根州的三个粗质地土壤剖面底土中发现的非石灰质，更红，更细的质地层（Bt）含有相当高的浓度的硅酸盐粘土矿物和“游离氧化铁”比相邻的砂层。这些地层的有机质也比相邻的砂质地层略多，而有机质则比同一剖面或相关剖面中的Bhir层位少得多。这些结构带可能来自或可能不来自与其正上方或正下方的层位相同的初始物质。它们全部或部分是成土作用的结果。质构带的形成可能涉及物理和化学机制。“游离氧化铁”-硅酸盐粘土-土壤中有机物的复合物的存在及其通过含有天然非石灰质土壤材料的人工柱的移动能力在实验室中得到证明。此外，硅酸盐粘土和铁有机质复合物的运动同时或在不同的时间可以假定。单个复合物或它们的组合的沉积可以由它们之间的化学相互作用、物理因素如土壤的润湿和干燥、或第三因素对一种或两种移动的成分的活性引起，游离石灰石粘土和/或有机铁复合物。结果表明，上述因素的组合需要解释的物理，化学和微观土壤学观察。要查看完整的文章，请插入光盘2，然后单击按钮8
Field and laboratory studies show that the nonlimy, more reddish, finer textured layers (Bt) found in the subsoils of three coarse-textured soil profiles in Michigan contain a considerably higher concentration of silicate clay minerals and "free iron oxide" than the adjoining sandier layers. These layers also have slightly more organic matter than the adjoining sandier layers, and considerably less organic matter than the Bhir horizons in the same or associated profiles. These textural bands may or may not be from the same initial material as the horizons immediately above or below them. They are wholly or in part the result of pedogenetic processes. Both physical and chemical mechanisms are probably involved in the textural band formation. The existence of complexes of "free iron oxide"-silicate clay-organic matter in the soil and their ability to move through artificial columns containing natural nonlimy soil material was demonstrated in the laboratory. In addition, the movement of silicate clay and iron-organic matter complexes simultaneously or at different times can be postulated. The deposition of the individual complexes or a combination of them may be caused by a chemical interaction between them, physical factors such as wetting and drying of the soil, or the activity of a third agency on one or both of the mobile constituents, e.g., free lime flocculating clay and/or organic-iron complexes. Results indicate that a combination of the above mentioned factors is needed to explain the physical, chemical, and micropedological observations. View complete article To view this complete article, insert Disc 2 then click button8