摘要 : The identification of sources and behavior of agricultural contaminants is important to control and manage groundwater quality of aquifer systems in rural areas. In this study, hydrogeochemistry of major constituents and stable is... 展开 The identification of sources and behavior of agricultural contaminants is important to control and manage groundwater quality of aquifer systems in rural areas. In this study, hydrogeochemistry of major constituents and stable isotope ratios of NO sub(3) super(-) and SO sub(4) super(2) super(-) in groundwater were determined to identify contamination sources and transformation processes occurring in soils and shallow groundwater of Yupori (Chuncheon district), a rural area in Korea with intense agricultural activities. The western gently sloped part of the study area, used mainly for vegetable cropping, was characterized by locally recharged Ca-Cl(NO sub(3)+SO sub(4)) type groundwater with elevated NO sub(3) super(-) concentrations (>10mgL super(-) super(1) NO sub(3) super(-)-N). Low delta super(3) super(4)S values of sulfate and delta super(1) super(5)N values of nitrate between 6 and 10%% indicated that a mixture of chemical fertilizers and manure is responsible for groundwater contamination with agro-chemicals. In the steeper eastern part of the study area, in which fruit orchards are the predominant land use, the groundwater type was Ca-HCO sub(3) super(-) water with lower NO sub(3) super(-) (<3mgL super(-) super(1) NO sub(3) super(-)-N) and sulfate concentrations. Elevated delta super(1) super(5)N values of NO sub(3) super(-) indicated that manure was the predominant NO sub(3) super(-) source, but lower fertilizer application rates were the predominant reason for the lesser extent of groundwater contamination. This study demonstrates that a thorough evaluation of hydrodynamic and hydrochemical parameters in concert with multiple stable isotope ratios including dual isotopes of NO sub(3) super(-) (N, O) and SO sub(4) super(2) super(-) (S, O) constitutes an effective approach for identifying sources and transformation processes of NO sub(3) super(-) and SO sub(4) super(2) super(-) in shallow groundwater systems underneath agricultural areas with different land use. 收起