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낙동강수계 농촌유역의 토지이용 및 수질 특성

Properties of Water Quality and Land Use at the Rural Area in the Nakdong River Watershed

김원일|이종식|정구복|이성태|김찬용|최철만|김진호
한국환경농학회 (The Korean Society Of Environmental Agriculture)|2007.06|한국환경농학회지 (Agricultural and Environmental Sciences)|제30권 제2호|pp. 99-106

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참고문헌

주제분류농학

초록

낙동강수계내 농촌유역의 토지이용 및 수질특성과의 관련성을 파악하기 위해서, 주요 농촌 소유역 중소하천 72지점을 대상으로 2001년, 2003년, 2005년의 수질을 각 년 3회씩 각 유역별로 조사하였다. 또한 유역의 오염현황과 유역특성과의 관계도 분석하고자 하였다. 낙동강 상류의 수질은 EC의 경우, 0.040～0.510 dS/m, DO는 3.55～22.60 mg/L, T-N이 0.32～16.64 mg/L, NO3-N은 0.00～12.21 mg/L, T-P는 0.000～0.860 mg/L, PO4-P는 0.000～0.640 mg/L로 조사되었고 하류의 수질은 EC의 경우, 0.030～0.520 dS/m, DO는 4.13～18.36 mg/L, T-N이 0.38～26.88 mg/L, NO3-N은Table 5. Pearson correlation coefficient between water quality and land useParameterBasinResidentialBareGrasslandForestPaddyUplandBOD0.0570.5410.4060.343-0.3590.2000.343EC0.0100.4370.2840.256-0.3870.4080.174CODMn0.0410.4380.2120.202-0.4310.3090.383T-N-0.0010.1480.153-0.027-0.0410.0430.001T-P-0.0320.3650.0890.298-0.3850.2910.332SS-0.0570.341-0.0320.277-0.4290.3230.390NH3-N0.0550.3900.3850.300-0.2470.0820.293pH-0.0330.0040.135-0.1010.032-0.0720.025CODCr-0.0050.4820.3070.278-0.4070.2920.346NO3-N-0.0430.027-0.010-0.028-0.0360.071-0.014PO4-P-0.0650.335-00020.265-0.4510.4490.282*Bold values are statistically significant at p<0.01, italics at p<0.05 0.10～20.12 mg/L, T-P는 0.002～0.820 mg/L, PO4-P는 0.00～0.690 mg/L로 조사되어 소유역별 수질은 큰 차이는 없었지만 전반적인 경향은 낙동강 상류지역의 소유역에서 유출되는 오염도가 하류지역의 소유역보다 높게 조사되었다. 수질과 토지이용의 점유율과의 상관관계는 BOD와 시가화가 0.541(p<0.01)로 가장 높은 양의 상관관계를 보였고, PO4-P가 산림과 -0.451(p<0.01)로 가장 낮은 음의 상관관계를 보였다. T-N, NO3-N, pH는 모든 유역 특성과 유의성이 없었고 수역은 모든 수질 항목과 유의성이 없었다. 또한 시가화는 T-N, NO3-N, pH을 제외한 모든 수질 항목에서 유의수준 1% 이내로 양의 상관관계를 나타내어 수질 악화의 원인으로 작용하였고 산림의 경우 대부분의 수질과 음의 상관관계를 보여 수질 개선의 요인으로 작용하였다.

Abstract

This study was focused on understanding the agricultural non-point sources pollution in 72 rural catchments of Nakdong river watershed from 2001 to 2005 every two year. Also, Pearson correlations between water quality and basin characteristic were computed. Water quality of this study watershed was better in 2003 than any other period. The water quality of upstream was recorded from 0.040 to 0.510 dS/m in EC, from 3.55 to 22.60 mg/L in DO, from 0.32 to 16.64 mg/L in T-N, from 0.00 to 12.21 mg/L in NO3-N, from 0.000 to 0.860 mg/L in T-P, and from 0.000 to 0.640 mg/L in PO4-P. At the downstream, EC was measured from 0.030 to 0.520 dS/m, DO from 4.13 to 18.36 mg/L, T-N from 0.38 to 26.88 mg/L, NO3-N from 0.10 to 20.12 mg/L, T-P from 0.002 to 0.820 mg/L, PO4-P from 0.002 to 0.690 mg/L. But, there was no difference between upstream and downstream for the water quality. Based on the correlation analysis between water quality and land use, correlation between BOD and residential was the highest positive correlation of 0.541 (p<0.01), and correlation between PO4-P and forest was the highest negative correlation of -0.451 (p<0.01). Also, T-N, NO3-N, and pH were not correlated with all basin characteristics, and basin was not correlated with all water quality parameter. According to the correlation, residential was causative of growing worst for water quality, and forest was causative of improving for water quality.

참고문헌 (19)

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