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研究生:盧奕穎
研究生(外文):Lu, Yi-Ying
論文名稱:未管理廢耕農地對河川水質與河岸侵蝕之影響──以有勝溪為例
論文名稱(外文):Effects of Unmanaged Agricultural Land Abandonment on River Water Quality and Bank Erosion in Yousheng Creek
指導教授:李宗祐李宗祐引用關係
指導教授(外文):Lee, Tsung-Yu
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:地理學系
學門:社會及行為科學學門
學類:地理學類
論文出版年:2021
畢業學年度:109
語文別:中文
論文頁數:93
中文關鍵詞:農地廢耕水質分析河岸侵蝕
外文關鍵詞:land abandonmentwater quality analysisriver bank erosion
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施肥是導致水質惡化的主因,因此停止農業活動被認為是改善水質的最有效方法,但是過往鮮少有研究仔細探討農地廢耕時間與河川水質變化之關連性。本研究使用了1992年至2018年間的航空照片和衛星影像數化了有勝溪沿岸農地廢耕面積的時間序列,並與逐月水質檢測結果兩相比較。結果顯示,直到2018年有勝溪流域內的農地有65%停止了農業活動,其中絕大多數的農地廢耕集中在2004年至2008年(廢耕期),佔總廢耕面積的75%。利用變異範圍法分析水質量測數據後,發現有勝溪廢耕期的氨氮濃度相比於2000年至2003年的耕作期,其高濃度發生機會增加120%,廢耕後期(2009年之後)中濃度發生的機會增加188%。另外本研究自影像資料中發現2005至2018年,有勝溪沿岸共有11%的農地面積遭遇河岸侵蝕,且以廢耕地為主,疏於管理的廢耕農地似乎更容易受到侵蝕的威脅,同時廢耕後期的總磷發生高濃度的機會也增加132%。本研究結果顯示,未管理廢耕地除短期內可能因缺乏地表敷蓋而造成肥料流入河川外,長期將遭受河岸侵蝕,除應正視廢耕地的管理外,亦表示農業活動對於河川的長遠影響。
Fertilization results in deterioration of the quality of water bodies. Therefore, stopping agricultural activities was regarded as the most effective method to improve the water quality. However, few studies have used the time-series data to explore the relations between river water quality and the abandonment of agricultural land. This study used aerial photos and satellite images from 1992 to 2018 to identify time series changes in the area of agricultural land abandonment along the Yousheng Creek, and compared to the monthly river water quality measurement. It was found that 65% of the agricultural land area had stopped agricultural activities by 2018, and 78% of it occurred in 2004 to 2008 (Abandonment Period). However, according to the result of the RVA alteration based on the water quality measurement data ,it was found that the chance of high-concentration of ammonia nitrogen in the Abandonment Period was greatly increased by 120% compared to that in the Pre-abandonment Period (2000-2003). Moreover, the chance of mid-concentration was increased by 188% compared to that in Post-abandonment Period (after 2009). In addition, a total of 11% of the agricultural land along the river was eroded by river water after 2005, and most of the eroded agricultural land was abandoned farmland. These poorly managed abandoned farmland seem more susceptible to flood, perhaps resulting in the occurrence of high-concentration total phosphorus has increased by 132% in the Post-abandonment Period. The results of this study indicate that the remaining fertilizer on abandoned and unmanaged farmland still poses threats to the river water quality via leaching in a short-term period and via bank erosion in a long-term period after the abandonment, implying the lingering effects of agricultural activities on river water qualities.
第一章 緒論 1
1.1 研究動機 1
1.2 研究目的 2

第二章 文獻回顧 3
2.1 農業活動與水質之關係 3
2.2 農地的廢耕與水質之關係 4
2.3 河岸侵蝕 6
2.4 臺灣山區的開墾、放領與廢耕 7
2.4.1臺灣山區的開墾(1955-1988年) 8
2.4.2農地放領政策(1989-2003) 8
2.4.3國土復育計畫(2005開始) 9

第三章 研究區域、材料、方法 11
3.1 研究區域 11
3.2 研究材料 13
3.2.1影像判釋資料 13
3.2.2流量、雨量、溫度、水質資料 15
3.3 研究方法 16
3.3.1農地廢耕判釋 16
3.3.2 河岸侵蝕判釋與分析 20
3.3.3 有勝溪土地利用數位化 21
3.3.4 水質檢測結果分析 22
3.4 研究流程 23

第四章 有勝溪的農地廢耕與水質變化 25
4.1 農業土地利用數化結果 25
4.1.1有勝溪農業土地利用時間序列 28
4.1.2有勝溪土地利用分期 29
4.2 有勝溪雨量及流量之變化 31
4.3 有勝溪水質變化之原因 34

第五章 有勝溪的河岸侵蝕 49
5.1 有勝溪河岸侵蝕事件 49
5.2 有勝溪河岸侵蝕與降雨之關連性 55
5.3 河岸侵蝕與河川水質之關連性 57

第六章 結論與建議 59
6.1 研究結論 59
6.2 研究建議 60
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