Some Physical, Chemical, and Mineralogical Properties of Compacted and Adjacent Soil Layers in Coarse-Textured Soils
Some Physical, Chemical, and Mineralogical Properties of Compacted and Adjacent Soil Layers in Coarse-Textured Soils
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粗质地土中压实土层和相邻土层的一些物理、化学和矿物学特性
DOI：
10.2136/sssaj1961.03615995002500060028x
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发表时间：
1961
期刊：
影响因子：
--
通讯作者：
M. E. Bloodworth
中科院分区：
文献类型：
--
作者：
M. H. Milford;G. Kunze;M. E. Bloodworth
对压实土层和邻近土层的一些物理、化学和矿物学特性进行了研究，这些土层选自德克萨斯州里奥格兰德河谷下游的耕种和原始威拉西细砂壤土，以更好地了解压实区及其发展。水力传导率测量和现场研究证实了硬质层的存在，在五个采样点中，硬质层首先在 3.5 至 7 英寸的深度处出现，深度范围为 7.5 至 12 英寸。粘土含量随深度增加而增加，而砂含量减少。对于所有样品，细沙（0.25 至 0.1 毫米）和极细沙（0.1 至 0.05 毫米）部分至少占总沙子的 95%，占总土壤的 60% 以上。测定土壤反应（pH）、有机质含量、阳离子交换能力、可交换阳离子以及可提取的二氧化硅、铝和铁。在任何层中均未发现大量可萃取胶结材料。对样品的矿物学分析表明，石英和少量的长石组成了沙子和淤泥部分，而伊利石和排列不良的风化云母材料占粘土部分的主导地位。与硬质层之上和之下的层相比，没有发现硬质层的化学和矿物学性质存在显着差异。
Some physical, chemical, and mineralogical properties of compacted and adjacent soil layers, which were selected from cultivated and virgin Willacy fine sandy loam soils in the lower Rio Grande Valley of Texas, were studied to attain a better understanding of the compacted zone and its development. Hydraulic conductivity measurements and field studies substantiated the presence of a hardpan layer, which was first encountered at a depth of 3½ to 7 inches and ranged to a depth of 7½ to 12 inches, at each of the five sites sampled. Clay content increased with depth, while sand content decreased. The fine (0.25 to 0.1 mm.) and very fine sand (0.1 to 0.05 mm.) fractions, for all samples, comprised at least 95% of the total sand and more than 60% of the total soil. Soil reaction (pH), organic matter content, cation-exchange capacity, exchangeable cations, and extractable silica, aluminum, and iron were determined. Extractable cementing materials were not found in important quantities in any of the layers. Mineralogical analyses of the samples showed that quartz and lesser amounts of feldspar composed the sand and silt fractions, while illite and poorly ordered, weathered micaceous materials dominated the clay fraction. No pronounced differences in the chemical and mineralogical properties of the hardpan layers as compared to the layers above and below the hardpan were found.