Estimation of Water Polludon Potential from Non Point Source in Rural Areas

Abstract

Pollutants runoff with rain water is a significant source of nutrients to lakes. Especially particulate matters play important roles to transport carbon, nitrogen and phosphorus. It is important but difficult to investigate NPS loading comprehensively from generation of pollutants to arrival at a lake. Alternatively in this study, surface soil of catchments was examined as a potential source of particulate pollutants. Soil was classified by particle size. Size distribution and carbon, nitrogen and phosphate contents were examined. Phosphate bioavailability was also examined. From point of view of bioavailability, soils from dry field has rapid and slow effects. While soils from paddy field had almost same slow effect as those of dry field, they showed little rapid effects.