창포를 이용하여 질소와 인의 농도별, 식물의 생장단계별, 오염수의 체류시간별로 질소와 인의 제거효과를 분석하였던 바, 그 결과를 요약하면 다음과 같다. 체류 1시간 후에 수중의 질소와 인의 함량을 현저히 감소시켰으나, 2~4시간 후에는 감소율이 극히 낮았다. 이러한 현상은 식물의 생장초기, 생장기, 생장최성기에서 동일하였다. 수중에 질소와 인의 함량이 많을수록 제거율이 높았고, 인보다는 질소의 제거효과가 크게 나타났다. 생장최성기에 가장 많은 질소와 인을 제거하였고 다음으로 생장기, 생장초기의 순이었으나, 생장단계간의 차이는 극히 작았다. 동일 포트에 4일 동안 체류시킨 것보다 2일 체류 후에 다른 포트로 시험수를 옮긴 것이 질소와 인의 제거율이 약간 높았다.

We examined the horizontal distribution of salinity and the concentrations of DIN and DIP after heavy rainfall events in coastal areas of South Korea from Yeoja Bay to Narodo and from Gwangyang Bay to Geomodo to determine whether fresh water actually flows into areas of Cochlodinium polykrikoides red tides and to observe its effect on the growth of this organism after heavy rainfall. Following heavy rainfall (155 mm) in the Yeosu and Suncheon regions, the average salinity was 21 and 29 psu at Yeoja Bay and in the coastal waters of Narodo, respectively. After 126 mm of rainfall, the values were 19 and 25 psu in the coastal waters of Yeosu and Geomodo, respectively. This may have been caused by an influx of fresh water, after the rainfall event, into the open sea coastal areas around Narodo and Geomodo from the Dong and Seomjin Rivers, which are about 3540 km away. After the rainfall, the concentrations of NH4-N, NO2-N, and PO4-P were slightly increased; however, the concentration of NO3-N was greatly increased and diffused throughout the coastal areas of Narodo and Geomodo, which frequently experience C. polykrikoides blooms. The influence of NH4-N, NO2-N, and PO4-P on the occurrence of C. polykrikoidesred tides in coastal areas around Narodo and Geomodo after heavy rainfall does not appear to be great. Instead, the occurrence C. polykrikoides red tides in the coastal areas of Narodo and Geomodo seems to be facilitated by NO3-N.