Nitrogen metabolism in the brackish Lake Nakanoumi. IV. Seasonal variation of nitrate nitrogen.

• DOI: 10.3739/rikusui.51.137
• Publication Date: 2011-06-09T03:51:32Z
• Authors: Yasushi SEIKE; Kunio KONDO; Hiroshi HASHITANI; Minoru OKUMURA; Kaoru FUJINAGA; Yoshio DATE
• Keywords: Seasonality; Wet season

The seasonal variation of nitrate in the upper layer brackish Lake Nakanoumi has been investigated by analysis data collected monthly during period 1976-1986. Upward trends concentration were found colder season (January to March), and also rainy (July). In contrast nitrate, chlorinity decreased at same time.A significant negative correlation between surface water was January, February, March July. addition, from increment cumulative rainfall, it concluded that accumulation is mainly caused discharge rivers into lake through rainfall melted snow.