論文
汽水湖の塩分濃度と湖底堆積物の珪藻遺骸群集から求めた塩分指数の関係
2018 年 34 巻 p. 1-7
詳細
2018 年 34 巻 p. 1-7
The salinity index is computed from diatom assemblages. In order to clarify the correlation between salinity and salinity index, data on salinity measurements and diatom assemblages of 51 bottom sediments in five brackish lakes are investigated: Kamoko in Niigata, Matsukawaura in Fukushima, Takahokonuma and Obuchinuma in Aomori, and Akkeshiko in Hokkaido. A correlation coefficient of 0.74 and regression equation of y=0.0645x+1.907 (x: salinity, y: salinity index) are acquired for the bottom sediments. In 41 bottom sediments except outliers, a correlation coefficient of 0.98 and regression equation of y=0.0923x+1.1421 are acquired. These expressions indicate 1.94 to 3.84 and 1.19 to 3.91 in salinity index are equivalent to brackish water (salinity: 0.5–30‰), respectively.
bottom sediments, brackish lake, diatom assemblages, salinity, salinity index
