基于监督分类的中国南方网纹红土色彩与形态研究

发布时间：2018-06-05 19:14

本文选题：网纹红土 + 中亚热带　；参考：《浙江师范大学》2015年硕士论文

【摘要】：网纹红土是由不同比例的红色基质、白网纹、黄网纹组合形成的具有特殊结构的一种沉积物。本文首次使用监督分类的手段将不同网纹红土剖面中红、白、黄色分别提取出来,并且计算出各自所占比例,并且建立与色度值的关系来分析网纹红土剖面上的网纹形态差异,尝试解释网纹红土的成因。主要结论如下：(1)在同一剖面中,总体上,红色所占比例均高于黄、白两色,而黄白两色的差异不大。但同一剖面不同层,颜色的比例存在较大差异。在上层剖面中,黄、红两色和白、红所占比例呈较为明显的消长关系,而白色与黄色的相关关系则表现得不明显；在剖面下层,黄红、红白和黄白所占比例关系与上层一致。其原因是铁氧化物的类型与土质红黄度有关。当网纹红土中含水量变化时,不同类型的铁氧矿物容易相互转化,使从而使土壤颜色改变。因此,红色基质中红黄网纹的消长关系可以指示土壤水分状况的差异。(2)剖面白色网纹所占的比例大小直接影响土体的网纹化程度,各地网纹红土的网纹化程度是存在差异的。在不同剖面中,白色网纹在九江所占比例最大,为36.430%,网纹形态以蠕虫状、根状为主。白色网纹所占比例较小的剖面,网纹形态呈不规则的絮状零星分布,并且网纹层面积小,发育程度差。(3)冲击相的网纹红土具有明显的河流二元沉积结构,而发育于基岩上的网纹红土与基岩有良好的渐变关系。剖面底部的白色网纹发育形态与方向通常与下伏岩层相似,揭示了网纹红土与地表、地下径流的关联。
[Abstract]:Reticulated red soil is a kind of sediment with special structure formed by the combination of different proportions of red matrix, white mesh and yellow net. In this paper, for the first time, the red, white and yellow are extracted from different network laterite sections by means of supervised classification, and their respective proportions are calculated, and the relationship with the chroma value is established to analyze the difference of mesh morphology in the network red soil profile. Try to explain the origin of reticulated red earth. The main conclusions are as follows: (1) in the same section, the proportion of red is higher than that of yellow and white, but the difference between yellow and white is not significant. However, the proportion of color varies greatly in different layers of the same section. In the upper section, the proportion of yellow, red, white and white is more obvious, but the correlation between white and yellow is not obvious, and the proportion of yellow, red, red and yellow white is the same as that of the upper layer in the lower layer of the section. The reason is that the type of iron oxides is related to the red yellowness of soil. When the water content in the reticulated red soil changes, different types of ferric oxide minerals are easily converted to each other, which makes the soil color change. Therefore, the relationship between red and yellow net patterns in red substrates can indicate the difference of soil moisture status. In different sections, the proportion of white mesh in Jiujiang is the largest, which is 36.430. The pattern of mesh is wormlike and root-shaped. In the section with small proportion of white mesh, the pattern of net grain is irregular and scattered, and the net layer area is small, the development degree is poor. 3) the red soil of impact phase has obvious fluvial dualistic sedimentary structure. The reticulated laterite developed on the bedrock has a good relationship with the bedrock. The shape and direction of the white network at the bottom of the section are usually similar to that of the underlying strata, which reveals the correlation between the red soil and the surface and underground runoff.
【学位授予单位】：浙江师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S155.25

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