강우시 비영농기와 영농기의 광역 논에서의 오염물질 유출 특성 = Pollutant runoff from a paddy field watershed during storms in the non-growing and growing seasons

다국어 초록 (Multilingual Abstract)

The objective of this research was to investigate pollutant dynamics from a 26.2 ha rice field watershed during non-growing and growing seasons. Water samples were collected, and runoff water was measured at 1～6 hours intervals during six storm events of the year 2011～2012 .
The water samples were analyzed for total nitrogen (TN), nitrate-nitrogen (NO3-N), total phosphorous (TP), phosphate-phosphorous (PO4-P), suspended solid (SS) and chemical oxygen demand (COD).
Mean flow-weighted concentrations of pollutants were 10.2 mg/L for TN, 6.9 mg/L for NO3-N, 0.50 mg/L for TP, 0.35 mg/L for PO4-P, 64.4 mg/L for SS and 29.4 mg/L for COD in the non-growing season and 1.7 mg/L for TN, 1.2 mg/L for NO3-N, 0.16 mg/L for TP, 0.07 mg/L for PO4-P, 59.0 mg/L for SS and 11.5 mg/L for COD in the mid-growing season.
The mean flow-weighted concentrations of pollutants except for SS in the non-growing season were higher than those in the mid-growing season. The mean flow-weighted concentration of SS in the non-growing season was almost the same as that in the mid-growing season. This may be because rice plant residues on the topsoil in the non-growing season act as surface mulch, and therefore prevent soil erosion.
The average ratio of NO3-N to TN in the non-growing season was 68.0%, similar to 70.0% in the mid-growing season. However, the average ratios of PO4-P to TP in the non-growing season was 70.0%, much higher than 44.0% in the mid-growing season. The high average ratios of PO4-P to TP in the non-growing season may be due to mineralization and desorption of P caused by low soil water content.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• Ⅱ. 연 구 사 3
• Ⅲ. 조사지구 및 연구방법 8
• 3.1 조사지구 8
• 3.1.1 개요 8
• 3.1.2 기상 11
• 3.1.3 배수로 13
• 3.1.4 논의 작물과 수분 상태 14
• 3.2 연구방법 15
• 3.2.1 조사시기 15
• 3.2.2 토양 15
• 3.2.3 시비시기 및 시비량 17
• 3.2.4 유속 17
• 3.2.5 강우량 19
• 3.2.6 수질 19
• Ⅳ. 결과 및 고찰 20
• 4.1 토성과 시비 20
• 4.1.1 토성 20
• 4.1.2 시비시기 및 시비량 22
• 4.2 강수량 24
• 4.2.1 비영농기 24
• 4.2.2 영농기 25
• 4.3 강우사상 개요 26
• 4.4 강우 오염물질 농도 27
• 4.5 시기별 강우시 오염물질 농도변화 특성 28
• 4.5.1 N 농도 28
• 4.5.2 P 농도 30
• 4.5.3 SS 농도 32
• 4.5.4 COD 농도 34
• 4.6 오염물질 유량가중 평균농도 36
• 4.7 유출량과 부하량 38
• 4.7.1 부하량 38
• 4.7.2 유출량-부하량 관계 39
• 4.8 오염물질 평균농도의 비 43
• 4.8.1 NO3-N/TN의 비 43
• 4.8.2 PO4-P/TP의 비 44
• Ⅴ. 결 론 45
• Ⅵ. 참고문헌 47