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

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  • SUGAI Ryukichi
    Shimane Environment & Health Public Corporation
  • NISIO Masahiro
    Izumo River Offi ce, Ministry of Land, Infrastructure, Transport and Tourism
  • MIZOYAMA Isamu
    Chugoku Regional Development Bureau, Ministry of Land, Infrastructre, Transport and Tourism
  • SEIKE Yasushi
    Faculty of Science and Engineering, Shimane University

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  • 汽水湖宍道湖における湖底堆積物からの無機栄養塩の回帰速度
  • キスイコ シンジコ ニ オケル コテイ タイセキブツ カラ ノ ムキ エイヨウエン ノ カイキ ソクド

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Abstract

To clarify the fluxes of nutrients from bottom sediments in the stratified 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 five 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 (PO43--P). Total inorganic nitrogen (TIN) was calculated as the sum of ammonia, nitrite and nitrate. Fluxes of TIN and PO43--P from the bottom sediments were calculated at 49 mgN m-2 day-1 and 7.7 mgP m-2 day-1, respectively, from temporal changes in nutrient concentrations. Thus, the N: P ratio of inorganic nutrient fluxes from the bottom was calculated at 6.4.

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