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KMID : 0380119820050010007
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Korean Journal of Ecology
1982 Volume.5 No. 1 p.7 ~ p.13
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Comparison of Water Qualities and Biotic Effects of Three River Waters in Taegu Area
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Lyu Seung-Won
Song Seung-Dal
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Abstract
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The water environmental characters of the Nakdong River. Geumho River and Sin Stream, both before-flood(Aug. 24) and after-flood(Sept. 8), have been compared, and their effects on the growth of Spirodela polykiza Shleiden have been examined. Before the flood, the concentrations of most of the chemical components of the Geumho River were similar to those of the Sin Stream; (COD, 19.6∼21.4; alkalinity, 177∼183; NH_4^+, 20.7∼24.4; NO_3^-, 3.9∼4.3; PO_4^2-, 3.4∼3.7; Mg^2+, 42; Ca^2+, 68.5∼69.7; Cl^-, 90∼92; SiO_2, 10.4∼11.2; SO_4^2-, 11∼32; LAS, 3.0∼3.8; Cl^(3+ ,6+), 0.007∼0.010ppm) but much higher than those of the NAkdong River (30∼40 fold for NH_4^1, SO_4^2-, PO_4^3- and LAS, and 2∼5 for COD, alkalinity, NO_3^-, Mg^2+, Cl^- and Cl^(3+, 6+). Especially in the Geumho River, Secchi disk transparency was very low (17㎝) and DO was not detected. The flood caused significant increases in some chemical components: NH_4^+, 1.0; NO_3^-, 9.6; SiO_2, 12.8 and SO_4^2-, 5.4ppm in the Nakdong River; DO, 1.0; NO_2^-, 0.92; NO_3^-, 22.2 and SiO_2, 17.6ppm in the Geumho River; DO, 3.0; NO_2^-, 1.4; NO_3^-, 22.2; SiO_2, 19.2 and SO_4^2-, 25.0ppm in the Sin Stream. General species diversity index (H^-) of phytoplankton community in the Nakdong River, Geumho River and Sin Stream before flood was 3.1, 2.7 and 1.6, respectively. After the flood, the phytoplankton growth was highly sparse in each river water, hence indices have no significance. The growth of S. polyrhiza was enhanced in Geumho River water (max, RGR=26%/day), while it ceased within 7days in Nakdong River water. Total chlorophyll content of S. polyrhiza in Nakdong River water. Geumho River water and Sin Stream water was 1.04, 1.99 and 1.25 chl. ㎎/g frond, respectively after 11days incubation. The concentration gradients of LAS (0.1∼3.8ppm), Cd^2+(0∼0.02ppm) and Cr^6+(0.004∼0.010ppm) by the gradients of the field showed no significant inhibitions on the plant growth.
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