Primary Production in Lake Kasumigaura, 1981-1985
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概要
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The seasonal succession of phytoplankton was investigated from 1978 to 1985 and the primary production was examined from 1981 to 1985 in Lake Kasumigaura. A large bloom of <I>Microcystis</I> spp. was observed every summer. <I>Synedra rumpens</I> and <I>S. aces</I> dominated in spring, and <I>Melosira granulata, Coscinodiscus tacustris, Cyclotella</I> spp., and/or <I>Chrysochromutina</I> sp. dominated in autumn and winter. Exceptionally large blooms of <I>Closterium aciculare</I> and <I>Oscillatoria agardhii</I> were observed in spring of 1979 and in autumn of 1982, respectively. The gross primary production correlated significantly with the water temperature, the solar radiation, and the chlorophyll <I>a</I> concentration, but not with the nutrient concentrations by multiple regression analysis. Therefore the nutrients were not limiting factors for the primary production in this lake. The annual gross primary production at a center of this lake ranged from 483 to 734 gC·m<SUP>-2</SUP>·yr<SUP>-1</SUP>, which was intermediate among the values reported in other lakes with <I>Microcystis</I> bloom.
- 日本陸水学会の論文
日本陸水学会 | 論文
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