A Hypothesis on Formation of the Subsurface Chlorophyll Maximum Observed in Lake Biwa in September of 1994.
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概要
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The vertical distribution of chlorophyll differed in. its pattern between September 1993 when monthly precipitation was 200-350 mm in July and August (similar to an average year) and September 1994 when it was well below the average (8-50mm). Chlorophyll was more abundant in the epilimnion in 1993, while in 1994 it was less in the mixed layer but instead showed a peak in the thermocline. Algal biomass decreased in the mixed layer due to the absence of nutrients from river water under drought conditions in September 1994. As a result, light intensity sufficient for photosynthesis could penetrate into the thermocline. Nutrients available for algae were supplied by physical and chemical processes from the hypolimnion and/or from turbid water transported from the shore-bottom into the thermocline.The subsurface chlorophyll maximum seems to have been formed by in situ growth of algae in the thermocline relatively rich in nutrients under sufficient light conditions.
- 日本陸水学会の論文
日本陸水学会 | 論文
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