Author(s): Jiro Maruyama; Masanori Nakai; Tomoya Murata; Masamitsu Arita
Linked Author(s):
Keywords: Floating-leaved plant; Nymphoides indica; Irrigation pond; Ecosystem; Water quality
Abstract: A field observation was carried out to examine the effects of a floating-leaved plant (Nymphoides indica) community on the ecosystem and water quality in an irrigation pond. The appearance of the plant community and the values of various water quality items were monitored through a year (2003). The plant community greatly makes positive contributions to the ecosystem and water quality in summer. It absorbs a lot of nutrients from the water body and bottom mud and suppresses multiplication of phytoplankton in the surface layer and generation of oxygen-deficient water masses in the bottom layer. In contrast, withering of the plant community leads temporary multiplication of phytoplankton and slightly gives negative influence in fall and winter.
Year: 2005