瀬戸内海底泥からの溶存無機態窒素およびリン溶出量の見積もり

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Benthic fluxes of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) from the sediment of the Seto Inland Sea were estimated by extending the station-basis benthic flux to each area according to the relationship between the benthic nutrient flux and the content of organic matter in the sediment. Ammonia-N flux was one order of magnitude higher in Osaka Bay (7.2-32 tonN d^<-1>), Harima Nada (12-52 tonN d^<-1>) and Suo Nada (13-60 tonN d^<-1>) than in the Bisan Strait (0.42-3.2 tonN d^<-1>) and Aki Nada (0.60-3.6 tonN d^<-1>). On the basis of unit area, not only Osaka Bay, Harima Nada and Suo Nada but also Hiuchi Nada, Bingo Nada and Hiroshima Bay showed higher rates in the ammonia-N flux. Although the phosphate-P flux showed a similar trend to those of ammonia-N flux in the regional variation, phosphate-P fluxes were less than one order of the ammonia-N fluxes.[Nitrite+nitrate]-N flux was small and often negative, suggesting that the overlying water might be a major source of nitrogen to denitrification process in the surface sediment. In the entire Seto Inland Sea, the benthic flux of ammonia-N and phosphate-P ranged from 49 to 197 tonN d^<-1> (2.9-12 mgN m^<-2>d^<-1>) and from 4.8 to 23.3 tonP d^<-1> (0.28-1.4 mgP m^<-2>d^<-1>), respectively. Fairly large proportion of benthic ammonia-N flux to riverine DIN input in some regions (greater than 80% in Hiuchi Nada+Bingo Nada and Suo Nada) indicates that the benthic nutrient flux is one of the important factors in controling the water quality of the Seto Inland Sea.
日本海洋学会の論文
1998-06-05

瀬戸内海底泥からの溶存無機態窒素およびリン溶出量の見積もり

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