不當之坡地農業開發常使台灣溪流水質受到嚴重的影響，如何保護水質為國人必須重視之課題。眾多研究顯示緩衝帶具有緩衝污染物與攔阻泥砂等功效，在溪流兩旁設置植生緩衝帶可有效解決農業非點源污染，並達到安定河岸與景觀美化等多種益處，且對於河川之生態保育助益良多，因此在溪流兩岸設置植生緩衝帶乃目前防治農業非點源污染最經濟且普遍之措施。
七家灣溪為國寶魚櫻花鉤吻鮭之棲地，但由於農業活動頻繁與大甲溪上游山坡地的開發，配合山區豐富的雨量及旱季密集灌溉，使得農地肥料在土層中移動迅速，因此本區溪岸農業非點源污染之防治措施極為重要。本研究分別探討不同土地利用對於土層營養鹽含量衰減與移動之關係，並配合環境背景值以推求各類營養鹽所須之安全土深，利用GIS進行分析與計算，以展示符合現地條件緩衝帶配置之寬度與區位。
研究結果顯示，本區各類營養鹽所需之安全土深分別為鉀(7.39m)、鈉(6.15m)、鈣(6.33m)、鎂(4.11m)、氮(3.6m)與磷(0.98m)；而在探討地層對於營養鹽衰減曲線的影響後，各類營養鹽所需之最大安全土深則變為以鎂(19.26m)最高，為了考慮地層對於營養鹽移動之影響，建議採用鎂的安全土深來做為配置植生緩衝帶之條件，表示土壤最少需要19.26m的土壤深度，才可過濾受污染的滲流水達到環境背景值之安全範圍。為有效防止各類營養鹽在七家灣溪造成污染，應以此為基準設計適當之植生緩衝帶，以維護當地之水源與生態環境。

Improper agricultural development on hillside deteriorates stream environment in Taiwan. How to protect the water quality is a very important issue. Many researches showed that the Vegetated Buffer Strips employed to intercept sediment and pollutant can be an alternative method. The Vegetated Buffer Strips along the streamside can solve the AGricultural NonPoint Source (AGNPS) pollution effectively and improve stabilization of riparian zones. It is good for conservation of ecosystem. Consequently, the Vegetated Buffer Strips is the most popular and economical way to reduce AGricultural NonPoint Source (AGNPS) pollution recently.
Chi Chia Wang Stream is the habitat of land-locked salmon. Because of agricultural activities and development on the upstream of Da Jia creek, the pollutants and nutrients transport actively with rainfall and irrigation. Therefore, it is very important to protect the water from AGNPS pollutants. This study established a model to estimate the suitable width of Vegetated Buffer Strips in different kinds of landuse placed on the Chi Chia Wang Stream riparian areas. Nutrients attenuation model and GIS were employed to analyze and calculate the safety depth.
The derived minimum safety depth for each element is potassium (7.39m), sodium (6.15m), calcium (6.33m), magnesium (4.11m), nitrogen (3.6m), phosphorous (0.98m), separately, the deepest safety depth is magnesium (19.26m) after simulation. Based on the nutrient transportation results, the soil needs 19.26m depth to reduce all the pollutants at least. In order to prevent the stream water and environment deterioration from the pollutants, the wider magnesium vegetated strip is suggested as a buffer zone to ensure pollution control effectiveness.

目 錄
頁次
中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖次 Ⅴ
表次 Ⅵ
壹、前言 1
貳、前人研究 2
一、櫻花鉤吻鮭 2
二、非點源污染 5
三、植生緩衝帶之相關研究 8
四、GIS相關之研究 16
五、植生緩衝帶相關法規 17
參、研究地區與方法 19
一、研究地區概況 19
（一）地理位置 19
（二）地質與土壤 20
(三) 植生種類 20
（四）水質 21
二、研究材料與方法 23
（一）研究材料 24
（二）研究方法 24
肆、結果與討論 30
一、土層營養鹽之衰減 30
二、營養鹽衰減曲線與安全土深之推估 31
三、N、P的探討 36
四、濱水區植生緩衝帶之配置 38
五、考慮地層影響植生緩衝帶之配置 41
（一）地層分布之探討 41
（二）地層分布對於安全土深之影響 43
（三）地層分布對於緩衝帶配置之比較 46
伍、結論 50
陸、誌謝 51
參考文獻 52
附錄一 61
附錄二 62
附錄三 63
附錄四 64
附錄五 65
附錄六 66
附錄七 67
附錄八 68
附錄九 68





圖 次
頁次
圖3-1 研究地區位置圖 19
圖3-2 研究流程圖 23
圖3-3 鑽孔位置圖 24
圖3-4 高程分布圖 26
圖3-5 坡度分布圖 27
圖3-6 坡向分布圖 27
圖3-7 高入滲濱水區植生緩衝帶配置圖 29
圖4-1 武陵地區土壤剖面飽和水力傳導度 30
圖4-2 鉀離子濃度變化圖 33
圖4-3 鈉離子濃度變化圖 33
圖4-4 鈣離子濃度變化圖 34
圖4-5 鎂離子濃度變化圖 34
圖4-6 七家灣溪濱水區植生緩衝帶配置圖 39
圖4-7 七家灣溪濱水區植生緩衝帶寬度圖 40
圖4-8 植生緩衝帶左右岸配置寬度圖 40
圖4-9 地質剖面線位置圖 41
圖4-10 AA’剖面地層分布圖 42
圖4-11 BB’剖面地層分布圖 42
圖4-12 CC’剖面地層分布圖 43
圖4-13 七家灣溪濱水區植生緩衝帶配置比較圖 46
圖4-14 植生緩衝帶右岸寬度比較圖 47
圖4-15 植生緩衝帶左岸寬度比較圖 47
圖4-16 有勝溪河岸農業 49


表 次
頁次
表2-1 污染源對水質之影響 6
表2-2 植生緩衝帶對泥砂與總磷傳輸之影響 12
表2-3 植生緩衝帶減少各種污染物之比較 12
表2-4 植生緩衝帶配置寬度之回顧 14
表4-1 林地各類營養鹽之衰減曲線方程式 35
表4-2 蔬菜區各類營養鹽之衰減曲線方程式 35
表4-3 安全土深估算表 36
表4-4 有效磷與NO3-之衰減曲線方程式 37
表4-5 AA’剖面安全土深之估算 45
表4-6 BB’剖面安全土深之估算 45
表4-7 CC’剖面安全土深之估算 45

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