Abstract
This study investigated the characteristics of shallow groundwater quality under agricultural areas dominated by rice paddy fields, vegetable fields, and a residential zone on an alluvial basin by examining spatial distributions of Cl\u., Na\u+, NO\u-\d3, and SO²\d4\u- concentrations. Seasonal changes in spatial distribution of ion concentrations during one cultivation period and the causes of the changes were discussed. Changes in spatial distribution of Cl. and Na+ concentrations of the groundwater were mainly affected by seasonal changes in precipitation concentrations. NO\u-\d3 concentration was strongly influenced by fertilization of vegetable fields and a following heavy rainfall. Elevated NO\u-\d3 concentration was less likely to occur under paddy fields than under vegetable fields. It was suggested that paddy fields might mitigate NO\u-\d3 contamination of shallow groundwater possibly because of denitrification in paddy soil in an anaerobic state during ponding. As for SO²\d4\u-, it was acknowledged that there could be a specific point source near a particular observation well.
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