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

Autor:	Yasushi Seike, Kaoru Fujinaga, Yoshio Date, Minoru Okumura, Hiroshi Hashitani, Kunio Kondo
Rok vydání:	1990
Předmět:	Wet season Hydrology Ecology Brackish water Aquatic Science Seasonality medicine.disease Snow chemistry.chemical_compound Nitrate chemistry medicine Nitrate nitrogen Environmental science Nitrogen cycle Surface water Water Science and Technology
Zdroj:	Japanese Journal of Limnology (Rikusuigaku Zasshi). 51:137-147
ISSN:	1882-4897 0021-5104
Popis:	The seasonal variation of nitrate in the upper layer in the brackish Lake Nakanoumi has been investigated by the analysis of the data collected monthly during the period of 1976-1986. Upward trends in nitrate concentration were found in the colder season (January to March), and also in the rainy season (July). In contrast to nitrate, chlorinity decreased at the same time.A significant negative correlation between nitrate concentration and chlorinity in the surface water in Lake Nakanoumi was found in January, February, March and July. In addition, from the analysis of the correlation between the increment of nitrate concentration in the surface water and cumulative rainfall, it was concluded that the accumulation of nitrate in the upper layer is mainly caused by discharge from the rivers into the lake through rainfall and melted snow.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0d8aefdc54c1e3f791241af611ac5611 https://doi.org/10.3739/rikusui.51.137 Zobrazit plný text záznamu