팔당호 인공식물섬 공극수에서 미생물 개체수와 체외효소활성도

초록

To evaluate the functions of vegetation mat of artificial floating island (AFI) installed in Lake Paldang, nutrients, such as total phosphorus (TP), dissolved inorganic phosphorus (DIP), total nitrogen (TN) and nitrate (NO3) and microbial factors such as total bacterial numbers, active bacterial numbers and exoenzymatic activities of β-glucosidase and phosphatase in pore water of medium and bulk lake water were analyzed. The concentration of TN and NO3 in pore water ranged from 4.4 to 7.5 mg L-1, from 1.2 to 3.8 mg L-1, respectively, which were ca. 2 times higher than those of lake water. The ranges of TP and DIP of were 1.4~4.1 mg L-1 and 0.003~0.137 mg L-1 in pore water of media which were 4~25 and 5 times higher than those of lake water, respectively. The numbers of total bacteria and active bacteria in pore waterwere about 10 times higher than those of laker water. Also, both phosphatase and β-glucosidase activities of pore water were on an average 10 times higher than those of lake water. These results suggest that the bacteria were playing important role for nutrients concentrating and cycling in media of artificial floating island. And the medium of artificial floating island contained newly created microbial ecosystem, which is responsible for sustaining the growth of macrophytes and the creation of new aquatic ecosystem.

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