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To clarify the fl uxes of nutrients from bottom sediments in the stratifi ed and eutrophic brackish Lake Shinji, surveys were conducted from 26 August to 1 September 2002. Investigations of the vertical distribution of nutrients were carried out at fi ve stations in the central basin of the lake. Using a handmade water sampler with 300 ml disposable syringes, bottom waters were collected simultaneously from 0.2, 0.4, 0.6, 0.8 and 1.0 m above the lake bottom. Water samples were analyzed for ammonia, nitrite, nitrate, and phosphate phosphorus (PO4 -P). Total inorganic nitrogen (TIN) was calculated as the sum of ammonia, nitrite and nitrate. Fluxes of TIN and PO4 -P from the bottom sediments were calculated at 49 mgN m day and 7.7 mgP m day, respectively, from temporal changes in nutrient concentrations. Thus, the N:P ratio of inorganic nutrient fl uxes from the bottom was calculated at 6.4.

Fluxes of inorganic nutrients from bottom sediments in the brackish Lake Shinji