| Title |
Studies on the Thermal Stratification and Algal Primary Productivity in Daechung Lake |
| Authors |
박동욱 ; 이홍근 ( Dong Wook Park ; Hong Keun Lee ) |
| Abstract |
This study was carried our to investigate the properties of thermal stratification, algal productivity, and the vertical distribution of dissolved nutrients and chlorophyll-a at Three stations of right bank in DAECHUNG Lake during the period from June to August, 1985, for the purpose of finding out the primary productivity of phytoplankton while summer stratification occurs. The following results were obtained: The stratification were showed obviously by difference of dissolved oxygen concentration water temperature, the average concentration of dissolved oxygen at hypolimnion layer was 5.7mg/1. The a average concentration of gross production at epilimnion layer was 0.70 O_2 mg/1/day in June, 0.97 O_2 mg/1/day in July, 1.30 O_2 mg/1/day in Aug, which was abruptly decreased at thermo cline layer. The average concentration of total phosphorous at hypolimnion layer was 0.059 mg/1 in June, 0.044 mg/1 in July, 0.321 mg/1 in Aug., which was over Vollenweider`s eutrophic standard 0.04 mg/1. The average amount of chlorophyll-a at epilimnion layer was 9.9 mg/m^3 in June, 6.3 mg/m^3 July, 23.9 mg/m^3 in Aug. It is guessed that the growth level of phytoplankton was large. A highly significant correlation was found between total phosphorous and chlorophyll-a at the epilimnion layer (r = 0.85 p : 0.01). Therefore it could be confirmed that phosphorous was the limiting factor to algal growth. |