著者

駒井 幸雄 中島 和一

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.17, no.11, pp.744-752, 1994-11-10 (Released:2008-01-22)

参考文献数

32

被引用文献数

3 2

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The background value of phosphorus in the Kako river watershed was estimated by using both the percentage of different types of strata occuring in the watershed and the average concentrations of phosphorus in rocks from the strata. The background value is 227μg·g-1. The phosphorus concentration of sandy bottom sediment in Kako river corresponded with the mean value of rocks from strata distributed around the sampling stations. The mean value of the phosphorus concentration in sandy bottom sediment (228μg·g-1) also agrees with the background value of phosphorus.The phosphorus concentration in sandy bottom sediment doesn't seemingly change, even though an artificial phosphorus load flows into the river. On the other hand, the phosphorus concentration of muddy bottom sediment is higher than the background value for phosphorus. This indicates that there is an accumulation of phosphorus in the bottom sediment.Most of phosphorus in rocks and bottom sediment is I-P(inorganic phosphorus). I-P fractionation was also carried out using a modification of the method of Williams et. al. HCI-P is a major component of I-P in the rocks, and CDB-P is a major form of I-P in the bottom sediment. The results suggest that phosphorus changes its form through a weathering and sedimentation process.

著者

村上 和仁 今富 幸也 駒井 幸雄 永淵 修 清木 徹 小山 武信

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.21, no.11, pp.757-764, 1998-11-10 (Released:2008-01-22)

参考文献数

25

被引用文献数

2 4

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The Seto Inland Sea in Japan is well known world-widely as one of the famous enclosed coastal sea, which is surrounded on all sides by the three large islands of Honshu, Kyushu and Shikoku, and is the largest inland sea in Japan (area ; 22,000Km2, total coastline ; 6,600Km, average depth ; 38m). In order to obtain the information about the environmental condition in the Seto Inland Sea, the quantity and distribution of macrobenthos, especially Annelida which is considered to indicate the sedimental condition, were investigated from the 425 sedimental samples as the Investigation for Environmental Management of the Seto Inland Sea (IEMS), which conducted from 1991 to 1996.The results obtained can be concluded as follows:1) The macrobenthos mainly observed in the Seto Inland Sea were Lumbrineris longiforia, Paraprionospio spp., Prionospio ehlersi and Theora fragilis, which were recognized as the indicator species of organic pollution.2) 16species of Spionidae were observed, i.e. Paraprionospio sp., Prionospio ehlersi, P. cirrifrea, Spiophanes sp. and so on.3) The species number and the individual number of Annelida were decreased with increase of muddy ratio, IL, COD, T-N, T-P and TOC.4) The species number and the individual number of Annelida were decresed with increase of Cd, Cu, Ph, Zn and Mn.5) Organic pollution was suggested especially in inner bay area because of dominations of some species of Annelida, Spionidae.