| Title |
Trend of Eutrophication in Lake Paldang ( 1988 - 1994 ) |
| Authors |
김동섭 ; 김범철 ; 황길순 ; 박주현 ( Dong Sup Kim ; Bom Chul Kim ; Gil Son Hwang ; Ju Hyun Park ) |
| Abstract |
The trend of trophic state change was surveyed in a reservoir, Lake Paldang, that is water resource to capital area. Primary productivity of phytoplankton, chlorophyll a concentration, transparency, total phosphorus concentration, BOD, and COD were measured in 1988, 1990, and 1992-1994 at three sites; dam site, the inlet site of the North Han River, and the inlet site of the South Han River. Tophic state parameters of 1992-1994 showed trend of eutrophication compared with those of 1988. Trophic state was meso-eutrophic in 1988, but it was over eutrophic threshold in 1992. Chlorophyll a concentration at the dam site increased from 2-10 ㎍/ℓ in 1988 to 5-25 in 1992-1994, primary productivity increased from 500-1000 to 1000-2000 ㎎C/㎡/day, total phosphorus concentration increased from 10-30 to 20-120 ㎎/㎥, transparency decreased from 1.5-4 to 0.5-2.0m. Annual phosphorus loading increased from 297 tP/yr in 1988 to 938 tP/yr in 1993. 80% of phosphorus loading was contributed by the South Han River. |