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論文中文名稱:農業非點源汙染對地下水水質之影響評估-以彰雲地區水稻田為例 [以論文名稱查詢館藏系統]
論文英文名稱:Impact of Agricultural Nonpoint Source Pollution on Groundwater Quality–Case Study of Paddy Fields in Changhua and Yunlin Area [以論文名稱查詢館藏系統]
英文姓名:Jhen-Ru Yang
英文關鍵詞:Nonpoint Source PollutionPesticideChemical Fertilizers
論文英文摘要:The chemical components and nutrient contained in pesticides and chemical fertilizers are the important sources of agricultural non-point source pollution. Rational use of pesticides and chemical fertilizers has become a critical issue for human health and ecological environment balance. This study aims to access the impacts of preferential flow and application of pesticides and chemical fertilizers on ground water quality in paddy field area. As the most important agricultural region, two experimental sites located in Changhua and Yunlin County was selected as the study areas to study the mechanisms of preferential flow. In-situ measurements including total field infiltration, double-ring vertical infiltration, and soil-water distribution was conducted in ponding state, and hydraulic conductivities for various depths within blocks and in the bunds were analyzed in laboratory. The soil and ground water quality monitoring data during the rice growing period obtained from the Environmental Protection Apartment (EPA) was used for the impact assessment resulting from fertilizer application.
Through checking out the details of pesticides and their concentration with physical and chemical characteristic and related indexes, and the soil and groundwater pollution monitoring and control standards from the EPA, we can further determine the reasons why pesticide still remains in paddy field. Although the different environmental media in the study region has not exceeded the monitoring and control standards established by EPA, it still needs to track its causes of residual and trends. Although with different kinds of pesticides applied in the two experimental sites, the analysis shows that 4,4-DDT, 4,4-DDE, chlorpyrifos, butachlor, paraquat, and terbufos can be detected in soils, and terbufos, phorate, and paraquat detected in ground water. It is worth noting that not all the above pesticides detected were applied in the experimental sites, which means some pesticides could move easily from neighborhood farmlands and with high risk to contaminate the soil and ground water. As for chemical nitrogenous fertilizer, various nitrogen concentration analysis for ponding water, soil, and ground water quality analysis showed that when the nitrogen fertilizer is hydrolyzed into ammonia nitrogen in top soil, it is bad not valid for proceeding the nitrification process due to the reducing environment, and this should be the important reason for ammonia nitrogen concentration in ground water keeps raising. In addition, an excessive use of chemical nitrogen fertilizer in paddy field also increase the contamination risk of ground water in this area.
Preferential flow developed near and underneath the bunds has been demonstrated by significant deviations between infiltration rates within the fields measured with infiltration rings, and percolation and seepage losses as derived from a water balance for the experimental field plots in this study. Such preferential flow could accelerate the downward movement of contaminated materials.The result of this study can be provided the relevant agencies as the reference for formulating the control nonpoint sources pollution control measures in the future.
論文目次:摘要 i
誌謝 vi
目錄 vii
表目錄 x
圖目錄 xiii
第一章 緒論 1
1.1前言 1
1.2研究目的 2
1.3論文架構及流程 2
第二章 文獻回顧 4
2.1台灣農藥使用概況 4
2.2農藥與水土環境汙染 6
2.3台灣肥料使用概況 7
2.3.1氮素於水田環境之轉化作用 8
2.3.2水田氮素之入滲淋洗 9
2.4水田優勢流-埂間滲漏機制及量化研究 10
第三章 材料與方法 12
3.1實驗田區概述 13
3.2田間試驗與土壤/入滲水力特性分析 17
3.2.1水稻田水收支平衡 18
3.2.2減水深試驗 21
3.2.3雙環定水頭試驗 22
3.2.4土壤水分分布觀測 24
3.2.5土壤分層成分分析 25
3.2.6水力傳導係數分析試驗 29
3.3水田環境氧化還原電位量測 32
3.4湛水入滲至地下水之時間推估 33
3.5農藥物化特性與指數分類 34
第四章 結果與討論 37
4.1田區垂直入滲及埂間滲漏/側滲結果 37
4.2土壤水分分布分析結果 39
4.3土壤分層成分分析結果 44
4.4土壤水力傳導係數K值分析 48
4.5湛水入滲至地下水之時間推估結果 50
4.5.1田區內垂直入滲至地下水位時間推估 50
4.5.2 埂間滲漏至地下水位時間推估 53
4.6農藥及施用與驗出 55
4.6.1彰化農藥檢出結果 55
4.6.2雲林農藥檢出結果 59
4.6.3驗出結果與討論 62
4.7水稻田環境氧化還原電位監測 70
4.8肥料施用量分析 72
4.9土壤及地下水氮素濃度分析 73
4.9.1不同深度土壤之氮素變化 73
4.9.2地下水之氮素濃度變化 75
4.9.3地表水之氮素濃度變化 76
4.9.4綜合探討 78
第五章 結論與建議 81
5.1結論 81
5.2建議 82
參考文獻 84
附錄A 彰化田中土壤粒徑分布曲線 91
附錄B雲林西螺土壤粒徑分布曲線 98
附錄C彰化伸港土壤粒徑分布曲線 102
附錄D彰化田中水分飽和度量測結果 108
附錄E 雲林西螺水分飽和度量測結果 112
附錄F 彰化伸港水分飽和度量測結果 113
附錄G 農藥濃度變化 114
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