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KMID : 1024520020110070705
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Journal of the Environmental Sciences
2002 Volume.11 No. 7 p.705 ~ p.711
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Effect of pH, nutrient and light on the early stage of Microcystis bloom
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Ha Kyong
Jang Min-Ho
Jeong Kwang-Seuk
Park Jae-Rim
Joo Gea-Jae
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Abstract
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In order to determine the factors causing Microcystis spp. bloom in the lower Nakdong River (Mulgum), we prepared wide ranges of pH, nutrient(N, P) concentration and the light through an enclosure experiment far 10days (pH gradient. 6.5, 7.5, 8.5, 9.5; gradient of N, P: Water (RW), RW only; four different levels of nutrient addition/day; light: 100, 85, 60, 30, 15% of full sun light). From three days, the difference of Microcystis density in each enclosures was observed. The high density of Microcystis was maintained in the treatments over pH 9.5 and 85% of full sun light. However, in all nutrient treatments, relatively lower cell density than that of pH and light treatments was observed. These results suggested that pH and light input may play more important roles than nutrients in the early development of Microcystis bloom in the eutrophic lower Nakdong River.
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KEYWORD
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Microcystis bloom, enclosure, light, nutrient, pH
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