| Title |
Long-term changes of Algal Growth in lake Paldang |
| Authors |
박혜경 ( Park Hye Gyeong ) ; 정원화 ( Jeong Won Hwa ) |
| Keywords |
Lake Paldang; Phytoplankton; Long-term variation |
| Abstract |
Long-term variations of algal growth at dam site of lake Paldang from 1996 to 2002 have been studied. Yearly mean value and standard deviation of chlorophyll a concentration have increased except 2002 representing the increase of algal growth potential in lake Paldang. Relative abundance of algal groups and seasonal succession pattern did not show same pattern every year and have fluctuated year by year. Diatoms have occurred throughout the year but showed large amount of biomass in winter and early spring. Cyanobacteria have dominated in summer. Relative abundance of other algal group increased in 2001 and 2002, causing higher chlorophyll a concentration during these years. Comparing with monthly mean value of cyanobacterial biomass and efflux from Paldang dam in summer season, the amount and time of mass efflux from Paldang dam, that is, the period of heavy rain appeared to determine the amount of cyanobacterial biomass of the year in artificial dam lake, lake Paldang. Based on the correlation analysis between chlorophyll a concentration and environmental factors, significantly high positive relationships were found in COD and BOD, and no significant relationships were found in nutrients, suggesting that primary productivity of phytoplankton occupies an important position within total organic matter loads in lake Paldang. |