有明海奥部における栄養塩濃度分布の季節変化 Seasonal Variation in Nutrient Distribution in the Inner Area of the Ariake Sea
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In order to investigate the seasonal variation in nutrient distribution in the mudflat-shallow water system, we made field surveys once a month from August, 2007 to July, 2008 in the bay head of the Ariake Sea. The NH<sub>4-</sub>N concentration increased in autumn and exceeded the NO<sub>3-</sub>N concentration. Then the NO<sub>3-</sub>N concentration increased and topped in January. Since the river discharge was small, such an increase of nitrogen concentration would be caused by the flux from the bottom sediments. The PO<sub>4-</sub>P concentration was also increased in autumn moderately. It decreased from January to March and still low until June. Such a variation would be also affected by the seasonal variation in PO<sub>4-</sub>P release from the sediment. These facts suggest the important role of the variation in nutrient supply from the sediments of mudflat in this area.
- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 65(1), 991-995, 2009
Japan Society of Civil Engineers