| Summary: | 碩士 === 國立彰化師範大學 === 地理學系 === 98 === Tsaotun lateritic terraces are located in central Taiwan. Most scholars compared the use of traditional methods to study the topography of the area landscape evolution of the cause and process. Therefore, this study viewed the soil topography; five of the six pedons Pingding, Dingcheng, Santsengchi, Erpingtzai, Leigung were described and calculated the development index to establish soil chronosequence.They were also analyzed for physical and chemical properties to discuss the soil genesis and soil classification. Furthermore, the study investigated which soil properties were suitable for indicators to established soil chronosequence, and used them to compare the northern and southern Pakua tableland terraces, and Chushan terraces with Tsaotun lateritic terraces.
The results showed that the degree of difference in soil genesis, mainly in soil color, soil texture, sand content, clay content, Fed content, horizon index,and weighted profile development index, were used to establish soil chronosequence. However, the process of landscape evolution is complicated and it’s often subject to interference. If we aim to make use of the concepts of soil topography to do comparison, we must use a number of indicators of soil chronosequence to support comparison. In this way, it won’t be underestimated and lead to misjudgment. Thereforethe, results of this study indicated that that soil development has the following sequences: Pingding（TTN-1a、1b）＞Dingcheng（TTN-2）＞Santsengchi（TTN-3）＞Erpingtzai（TTN-4）＞Leigung（TTN-5）. The study found Pingding in the process of soil genesis, soil erosion has occurred, then re-genesis resulting in thinner soils, and led to Slightly lower than Dingcheng in some soil properties. If through the view the soil genesis, the comparative results of Tsaotun lateritic terraces was in line with previous studies.
In this study, according to clay content, soil texture and weighted profile development index, the results suggested that the northern and southern Pakua tableland terraces formed the earliest time possible, followed by Tsaotun lateritic terrace, the last group for the Chushan terraces.
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