非生物体ニゴリの研究-1-河口域における栄養塩濃度の変動に関与するニゴリ

概要

論文の詳細を見る
The relationship between particulate suspensions and nutrient contents in estuary water is not well known. In the estuary where turbidity is high, fluctuation of nutrient contents in a half tidal period is usually large, and it is sometimes observed that the lower the salinity, the lower is the nutrient contents. It seems conceivable that this phenomenon may be caused by the suspenped matter in the estuary. In this study, to clarify the idea mentioned above, salinity, phosphate-phosphorus, current velocity and turbidity at the same station were determined every one hour for a half tidal period, and the examination on X-ray diffraction of sediment at the mouth of the Chikugo river was carried out.The results obtained were as follows. 1) Particulate suspensions and bottom sediment in the estuary were composed of montmorillonite and illite clay which has strong properties of floc formation. 2) Fluctuations of PO4-P during the stagnant period at ebb tide were much larger than those at flood. 3) Percentage removal of PO4-P from the estuarine water by the addition of pure montmorillonite clay was in the range of 75-99%. From these results, it was presumed that particulate suspensions of clay minerals play an important role on the large fluctuation of nutrient contents in the estuary.
日本水産學會の論文