本文選題：網紋紅土 + 中亞熱帶��； 參考：《浙江師范大學》2015年碩士論文

【摘要】：網紋紅土是由不同比例的紅色基質、白網紋、黃網紋組合形成的具有特殊結構的一種沉積物。本文首次使用監(jiān)督分類的手段將不同網紋紅土剖面中紅、白、黃色分別提取出來,并且計算出各自所占比例,并且建立與色度值的關系來分析網紋紅土剖面上的網紋形態(tài)差異,嘗試解釋網紋紅土的成因。主要結論如下：(1)在同一剖面中,總體上,紅色所占比例均高于黃、白兩色,而黃白兩色的差異不大。但同一剖面不同層,顏色的比例存在較大差異。在上層剖面中,黃、紅兩色和白、紅所占比例呈較為明顯的消長關系,而白色與黃色的相關關系則表現(xiàn)得不明顯；在剖面下層,黃紅、紅白和黃白所占比例關系與上層一致。其原因是鐵氧化物的類型與土質紅黃度有關。當網紋紅土中含水量變化時,不同類型的鐵氧礦物容易相互轉化,使從而使土壤顏色改變。因此,紅色基質中紅黃網紋的消長關系可以指示土壤水分狀況的差異。(2)剖面白色網紋所占的比例大小直接影響土體的網紋化程度,各地網紋紅土的網紋化程度是存在差異的。在不同剖面中,白色網紋在九江所占比例最大,為36.430%,網紋形態(tài)以蠕蟲狀、根狀為主。白色網紋所占比例較小的剖面,網紋形態(tài)呈不規(guī)則的絮狀零星分布,并且網紋層面積小,發(fā)育程度差。(3)沖擊相的網紋紅土具有明顯的河流二元沉積結構,而發(fā)育于基巖上的網紋紅土與基巖有良好的漸變關系。剖面底部的白色網紋發(fā)育形態(tài)與方向通常與下伏巖層相似,揭示了網紋紅土與地表、地下徑流的關聯(lián)。
[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.
【學位授予單位】：浙江師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S155.25

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本文編號：1983121