Seasonal variations in nutrients and a factor limiting phytoplankton growth in Lake Ohnuma.
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概要
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Nutrient concentrations and alkaline phosphatase activity were measured in Lake Ohnuma from June 1995 to March 1997. Sufficient amounts of dissolved inorganic nitrogen remained throughout the year, whereas soluble reactive phosphorus concentrations were extremely low (close to the detection limit). The N:P ratio in the standing stock of nutrients ranged 74-3000 (by atoms), far richer in nitrogen than the Redfield ratio. Chlorophyll a concentrations were high (5-22μg L<SUP>-1</SUP>) during icefree seasons, but the elemental composition of phytoplankton exhibited a moderate phosphorus de-ficiency. A high seasonal variability in alkaline phosphatase activity suggested that not only was phytoplankton growth highly limited by phosphorus, but that the degree of this limitation varied. Alkaline phosphatase activity served as a simple and an effective indicator for judging the phosphorus status of phytoplankton.
- 日本陸水学会の論文
日本陸水学会 | 論文
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