仙台市蒲生干潟水域におけるクロロフィル-αと栄養塩の分布(創立25周年記念特集号-スポーツ科学の諸問題-)
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The purpose of the present study is to make a qualitative understanding of mechanism of eutrophication and pollution of the water area at Gamo lagoon, especially through the distribution of chlorophyll-a and nutrients in this lagoon water area. This paper consists of the following topics: 1. Characteristics of water flowing into this lagoon water area from the sea and the river Nanakita. 2. Variation of nutrient concentration with lapse of the time at each station. Discussed nutrients are reactive phosphate -phosphorus, ammonium-, nitride- and nitrate-nitrogen. 3. Aspects of reproduction of phytoplankton in terms of changes in the concentrations of chlorophyll-a, -b, -c, phaeophytin and so on. From our observational results, its lagoon water is formed by the mixture of the sea water, the estualline water and the water drained from the fish farm located up the lagoon water area. Furthermore reactive phosphate concentration in the lagoon water is brought about various changes by the degree of circulation of the water with tide at each station, while nitrate concentration decreases with increasing of chlorophyll-a at each station. At St. 1 and St. 2 ammonium concentration increased with, increasing of chlorophyll-a, but at Stations from 3 through 7 ammonium is consumed with increasing of chlorophyll-a. At St. 5 and St. 6 nitride is in high concentration, while at Stations from 1 through 4 nitrite is in low concentration as compared to nitrate concentration. From the facts mentioned above, it is presumed that at low tide phosphate may be lively reproduced from particulate matters and subsoils in the lagoon water, and the decrease of nitrate concentration may indicate the reproduction of phytoplanktons. Around the stations located at the back parts of lagoon water area ammonium may be taken in by phytoplanktons, because nitrate is lack and nitride may be not easily oxidized.
- 仙台大学の論文
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