Effect of Turbid Water on the Phytoplankton Community in Imha Reservoir

Abstract

We investigated the effect of the turbid water on the phytoplankton community in the 4 sites of Imha reservoir. The turbidity of water was proportional to the concentrations of SiO2-Si. Therefore, as the turbidity of water grow, the concentration of SiO2-Si increased. And the both the turbidity of water and the concentrations of SiO2-Si were increased as the water run deep. The concentration of chlorophyll-a decreased as the depth of water increased. Seventy phytoplankton taxa were identified and the most abundant group was Chlorophyceae consisting of 32 taxa (46%), and Cyanophyceae and Bacillariophyceae consisted of 12 taxa (17%). And Euglenophyceae, Synulophyceae, Cryptophyceae and Dinophyceae consisted of 6 taxa (9%), 4 taxa (6%), 3 taxa (4%) and 1 taxon (1%), respectively in Imha reservoir. The concentrations of phytoplankton were increased according to the turbidity of water because of the high amount of organic nutrition which is presented with turbid water. And especially, the concentrations of nitrogen increased easily because of the weak binding to the soil particle. In conclusion, total nitrogen and SiO2-Si flowed into the Imha reservoir with soil particle, and these inorganic nutritions affect the growth of algae.

Variation on the Growth Rate of Plants by Submersion of High Turbidity - A Case Study on Salix Species -

“…안동 임하댐의 경우 국내 대표 모래하천인 낙동강에 위 치하고 있으며 활착된 식생은 갯버들, 갈대, 달뿌리풀 등 과 같은 전형적인 수변 식생이다 (Woo et al, 2004 (Yum et al, 2007;Yum et al, 2008;Park et al, 2008) 임하댐 하류 하천식물 피해 및 생태계 변화 등 심각한 문제가 발생하였다.…”