Spatial distribution of slopeland acid sulfate soils in northeastern Taiwan

• Main Authors: Huey-Shan Chen, 陳慧珊
• Other Authors: 林昭遠
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/61067130394141621168

碩士 === 國立中興大學 === 水土保持學系所 === 105 === Generally, grasses are the pioneer plant in disturbed area and then successes to woody plants under subtropical and high humidity climate in northeastern Taiwan. However, Rui-Fang is a mining area with abandonment coal mine. Because the mining activity from 1895 to 1990, tailings of coal mine with high sulfides is vulnerable to oxidized to sulfuric acid and then cause Acid Sulfate Soils (ASS). Therefore, vegetation growth and succession will be disturbed by ASS so the distribution of ASS can be an important index for retarding vegetation succession. In this study, the areas of grass land were delineated by imageries of SPOT and Google Earth. Furthermore, the reason of grass land distribution would be discussed with topographical factors (elevation, slope and aspect) and the distance from coal mines coupled with cluster and discrimination analysis. Finally, the verification of delineation results for ASS which is potential area of mines tailings was compared with field survey and environment geology map draught by Industrial Technology Research Institute. The results showed that the overall accuracy of grass land reached 92.8%. The higher ratio of grass land in a subdivision has, the higher discrimination accurate it is. According to the study results, the grass land could be extracted by satellite images. The potential distribution of mines tailings would be delineated by environment indices such as topographical factors and the distance from coal mines coupled with statistical analysis in order to avoid secondary use of mines tailings.