厚岸湖・厚岸湾堆積物中の脂質組成と分布

概要

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Sediment samples from Akkeshi lake and Akkeshi bay were analyzed for mud contents, CaCO_3, organic C, N , δ^<13>C and lipid compounds. Land derived organic matter in the sediments are over 71% at the river mouth of Akkeshi lake, 35.3～41.0% at the bay head of Akkeshi bay and 18.9% at the open sea. N-Alkanes and n-alcohols in the sediments are rich, these L /H are small and these CPI are high at the river mouth of Akkeshi lake and the bay head of Akkeshi bay. The concentrations of dinosterol (a) are small at Akkeshi lake, but this is large at the bay head and mid bay of Akkeshi bay. In a triangular diagram of C_<27>, C_<28>, C_<29> -steroles, 2 sediments of the river mouth of Akkeshi lake are plotted on terrestrial and a sediment of Akkeshi lake is plotted on estuarine or bay. Many sediments of Akkeshi lake and Akkeshi bay are plotted on open marine. The distribution pattern-1; CN ratio, δ^<13> C, n-alkanes (μggC) , cholesterol (G)(%) and β-sitosterol (U)(%) are decreased with increasing water depth and farther seaward from the coast. The distribution pattern-2 ; the higher concentrations of n-alkanes (μgg) , n-alcohols (μgg) and dinosterol (μgg) are found in the sediments of bay head and mid bay of Akkeshi bay. The lipid contents in the sediments of Akkeshi lake are similar to the lipid contents at the Omura bay. The lipid contents at Akkeshi bay are similar to the lipid contents at the Tomie bay.
長崎大学の論文
2005-06-30