Abstract
Lake Sagata (37°  49′ N, 138° 53′ E, alt. 4.5 m, depth 50–150 cm, area 0.375 km2) is one of about 20 sand-dammed lakes situated between two parallel sand dunes. Only spring water flows into the lake, which is surrounded by a comparatively broad Phragmites zone of 0.3 km2. Spring water containing a very high concentration of NO3, with 9.3 – 17.75 mg l−1, which seems to originate from agricultural cultivation on the periphery, flows into the lake. This decreases gradually as water flows through Phragmites belts and floating-leaved plant vegetation (Trapa spp. and Nelumbo nucifera) reached 0.01–0.07 mg l−1 in spillage water in summer. Chlorophyll-a concentrations in the lake ranged from 150 in spring to 400 mg m−3 in summer, showing progressive eutrophication compared with a condition of the lake in 1979. Macrophyte vegetation plays important roles with denitrification in the nutrient dynamics of shallow sand dune lakes.
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Fukuhara, H., Kawakami, A. & Shimogaito, T. Characteristics of nutrient dynamics in Lake Sagate, Japan, a shallow sand dune lake. Hydrobiologia 506, 93–99 (2003). https://doi.org/10.1023/B:HYDR.0000008557.62019.32
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DOI: https://doi.org/10.1023/B:HYDR.0000008557.62019.32