Behavior of Nutrients in Runoff Water from a Small Rural Watershed
2009
Oh, K.Y. (National Institute of Environmental Research, Incheon, Republic of Korea) | Kim, J.S. (Chungbuk National University, Cheongju, Republic of Korea), E-mail: [email protected] | Oh, S.Y. (National Institute of Environmental Research, Incheon, Republic of Korea)
The purpose of this study was to investigate characteristics of behavior of nutrients such as TN (Total nitrogen), TDN (Total dissolved nitrogen), TP (Total phosphorus) TDP (Total dissolved phosphorous) in runoff water from a nonpoint source dominated watershed (6.67 ㎢). Regular and intensive flow measurement and water sampling were taken during two years (February 2002 to January 2004) in the Ingyeong River, a tributary of the Han River. The mean concentrations of nutrients during rainy days were significantly (p less than 0.05) higher than those during dry days. The mean TDN/TN ratio in rainy days (95%) is almost identical to that in dry days (96%), but mean TDP/TP ratio in rainy days (24%) significantly decreased compared with that in dry days (66%), suggesting that dominant form of TP is shifted from dissolved form to particulate form. Accordingly, the measures (.eg. filter strips, cover crops) to reduce soil erosion for fallow upland in the rainy season should be taken to control particulate phosphorous.
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