| Title |
Trend Analysis of Algal Growth Measured in the Major Lakes of Korea |
| Authors |
박석순(Seok Soon Park),박선영(Sun Young Park) |
| Abstract |
This paper presents trend analyses of algal growth in the 12 major lakes of Korea, which include Paldang, Chungiu, Soyang, Chuncheon, Euiam, Cheongpyeong, Andong, Imha, Namgang, Hapcheon, Daecheong, and Oakjung. The parameter tested in this study is the monthly data of chlorophyll-a measured from 1990 to 1997. The normality of data was examined by the chi-square goodness-of-fit test and the skewness test. The seasonality was examined by the Kruskal-Wallis test. The long term trend was analyzed by the seasonal Mann-Kendall test. Water temperature was considered as an exogenous variable in the trend analysis of a few lakes where a significant correlation between temperature and chlorophyll-a was observed. Removal of variance in chlorophyll-a due to exogenous variables increased the power and efficiency of the trend analysis. The results indicated that there were no significant trend of chlorophyll-a concentrations in most studied lakes except for Euiam, Daecheong, and Hapcheon lake. For Euiam lake and Daecheong lake, there were upward trends. On the other hand, there was a downward trend in Hapcheon lake. |