Nitrogen mass balance and river concentration dependence in the stock in brackish Lake Shinji

Q4 Environmental Science Japanese Journal of Limnology Pub Date : 2015-01-01 DOI:10.3739/RIKUSUI.77.47

H. Kamiya, Shogo Sugahara, Y. Saga, S. Sato, Y. Nojiri, Toshiaki Esumi, M. Kishi, A. Fujihara, T. Godo, H. Ohshiro

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Abstract

Calculating the change of stock of each month of the nitrogen in Lake Shinji, a brackish lagoon in Japan, it is assumed that TN is released from the sediment. This relationship has not been observed for the mean water temperature and TN release from the sediment. With respect to TN in Lake Shinji, a signiﬁcant release from the sediment was not seen in the summer, which was observed for TP, but the effect of the TN concentration in River Hii was large as compared to the TN concentration of Lake Shinji. As for TN content in Lake Shinji, a correlation between the TN concentration of River Hii of the same month was observed ( r = 0.57, p < 0.001 ) . Nitrogen mass balance for 19 years was calculated. The percentage of annual deposition of TN to the TN inﬂow was in the range of -4.2 to 38.4%, and 19.8% on average. We calculated the average annual value balance of TN and TP for 19 years. For TN, 1480 t ﬂowed in, 1170 t ﬂowed out, and 310 t settled in the Lake Shinji, and for TP, 134 t ﬂowed in, 106 t ﬂowed out, and 28 t had settled in Lake Shinji. Settling TN/TP ratio was 10.7, which was 11.4 for an annual average TN/TP ratio of Lake Shinji.

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真鸡咸淡湖水中氮的质量平衡与河流浓度依赖性

计算日本咸淡咸水泻湖真司湖每个月的氮储量变化，假设TN是从沉积物中释放出来的。在平均水温和沉积物中全氮释放量之间没有观察到这种关系。对于真尻湖的TN，夏季沉积物的释放不明显，TP的释放不明显，但Hii河的TN浓度的影响大于真尻湖的TN浓度。真尻湖的TN含量与同月Hii河的TN含量呈相关性(r = 0.57, p < 0.001)。计算了19年的氮质量平衡。年总氮沉降占总氮流入的比例在-4.2 ~ 38.4%之间，平均为19.8%。我们计算了19年来总氮和总磷的年平均值差额。TN入库1480 t，出库1170 t，入库310 t; TP入库134 t，出库106 t，入库28 t。沉降TN/TP值为10.7，而真司湖年平均TN/TP值为11.4。

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来源期刊

Japanese Journal of Limnology Environmental Science-Ecology

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期刊介绍： The Japanese Society of Limnology was founded in 1931 for the purpose of promoting and fostering the study of limnology in the broad meaning of the term. It publishes quarterly "The Japanese Journal of Limnology" and holds an annual meeting consisting of lectures, discussions and symposiums on limnological subjects.