Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Long-term Variations of Trophic State and Phosphorus Loading in Lake Andong, Korea

안동호의 장기간의 영양상태와 인부하량

  • Kwon, Sang-Yong (Dept. of Environmental Engineering, Samcheok National University) ;
  • Kim, Bom-Chul (Dept. of Environmental Science, Kangwon National University) ;
  • Heo, Woo-Myung (Dept. of Environmental Engineering, Samcheok National University)
  • Published : 2002.12.31
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Abstract

The variation of trophic state was measured in a reservoir (Lake Andong, Korea) from 1993 to 2000. Phosphorus loading from the watershed was estimated by measuring total phosphorus concentration in the main inflowing stream (the Nakdong River). Phosphorus discharge from the pen-type fish farms was estimated from the amount of fish feed and the rate of phosphorus excretion per feed weight. The transparency in summer was about 2.0 m in 1993 and 1994, but it decreased to about 1.2 m in 1997 and 1998, and recovered to about 2.3 m in 1999 and 2000. TP increased from $11-30\;mgP/m^3$ in 1993 to $18-42\;mgP/m^3$ in 1998, but recovered to $8-13\;mgP/m^3$ in 2000, whereas TN decreased slightly from 1.81-2.96 mgN/L in 1993 to 1.17-1.80 mgN/L in 2000. TN/TP ratios decreased from 82-281 in 1993 to 21-143 in 1998, but again increased to 101-209 in 2000 due to the decrease of TP. The average chlorophyll-a concentration in growing season was in the range of $4.8-16.2\;mg/m^3$ from 1993 to 1997, but it decreased to $3.7-5.2\;mg/m^3$ after 1998. Trophic State Index had shown a gradual increase until 1996, and since then it has declined. The major cause of the trophic state recovery is thought to be the removal of fish farms in April 1998.

안동호에서 1993년부터 2000년까지 영양상태와 인부하량의 장기적인 변화를 조사하였다. 조사항목은 탁도, 수온, 투명도, 인, 질소 및 엽록소 a 농도 등이며, 댐 앞지점에서 월 1회 조사하였다. 유역으로부터의 인부하량은 주 유입수에서 주 1회 혹은 우기시 수시로 조사된 자료와 유입수량으로부터 산출하였다. 양어장으로부터의 인부하량은 사료공급량과 원단위로부터 산출하였다. 여름에 히소투명도 값이 1993년과 1994년에는 약 2m정도이었으나, 1998년에는 약 1m를 보였다. 표충의 총인 농도는 1993년에 $11-30\;mgP/m^3$에서 1998년에는 $18-42\;mgP/m^3$으로 약간 증가하였다. 그러나 2000년에는 $8-13\;mgP/m^3$으로 회복되었다. 표층의 총질소는 1993년에 1.81-2.96 mgN/L에서 2000년에는 1.17-1.80 mgN/L로 약간 감소하였다. TN/TP비는 1993년에 82-281이었으나 1998년에는 21-143로 감소하였다. 그러나 2000년에는 TP의 감소에 따라 101-209로 다시 증가하였다. 여름에 엽록소 a 농도는 1993년부터 1997년까지 $4.8-16.2\;mg/m^3$의 범위를 보였으나 1998년 이후에는 $3.7-5.2\;mg/m^3$으로 다소 감소되었다. 안동호의 영양상태는 1996년까지 점차적으로 증가되어왔으나 그 이후 감소되고 있는 것으로 나타났다 영양상태 회복의 주요 요인은 1998년 4월에 양어장의 철거에 따른 것으로 판단된다.

Keywords

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