<P>PROBLEM TO BE SOLVED: To provide an artificial floating island effectively suppressing proliferation of phytoplankton to increase a water quality-purifying function, even if the artificial floating island area ratio to a water area is small. ??<P>SOLUTION: This artificial floating island 1 includes a vegetation base 10, and support means 20 and 30 supporting in a condition of floating the vegetation base 10 in water. Emerging plants 40 which emit an allelopathic agent suppressing proliferation of phytoplankton are planted on the vegetation base 10. The artificial floating island 1 suppresses proliferation of phytoplankton to purify water quality by the artificial floating island of an about 5% area to a water area, by, in addition to a shading function, a function effectively suppressing proliferation of Microcystis of blue-green algae as a cause of generation of water-bloom by allelopathic agent emitted from the root stems 41 of the emerging plants 40 planted on the vegetation base 10 of the artificial floating island 1, an adhesion, contact sedimentation function of phytoplankton and suspended solid to the porous vegetation base of a large specific surface area, and a purifying function multiple with a predation function of phytoplankton through an increase in zooplankton. ??<P>COPYRIGHT: (C)2010,JPO&INPIT ??
