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Title Transcription
コスイ カンキョウ ノ ジンイテキ カイゾウ ト テイセイ ユウコウチュウ ノ グンシュウ ヘンカ ソノ4 ユウコウチュウ ノ グンシュウ ヘンカ ニ タイオウシタ カガクテキ サンソ ヨウキュウリョウ COD ト シンジコスイ ノ ヘンカ
Title Alternative
Benthic Foraminiferal Changes in Relation to Human Activities in Brackish Environment(Part 4) : Chemical Oxygen Demands (COD) Correlated with Foraminiferal Event and the Changes of Waters in Lake Shinji
File
language
jpn
Author
Nomura, Ritsuo
Description

  A variation of chemical oxygen demands of bottom water in Lake Shinji was examined for 24 years of 1972-1995, based on the reports from Shimane Prefectural Government. A critical change of COD values in the time series occurred in 1980, which is exactly correlated with the benthic foraminiferal changes, as reported by Nomura and Yoshikawa (1995).
 An increase of Ammonia beccarii in sediment surface indicates an increase of organic matter in bottom water, which is reasonably interpreted from the view Point of COD.
  The increased values of COD during 1980-1982 indicate that the water characters of Lake
 Shinji change to nutrients rich water, with an input of organic matter. The cause of this change might have been due to a construction of several embankments or bottom sediments dredging to reclaim the northwestern part of Lake Nakaumi, which hindered the movement of bottom water. So far as COD values indicating constant variations after 1983, such water characters do not changed to the present. However, foraminiferal occurrence indicates a continuation of increased organic matter into bottom water.
Subject
Chemical Oxygen Demands(COD)
COD event
foraminifera
Journal Title
Laguna : 汽水域研究
Volume
3
Start Page
25
End Page
31
ISSN
21852995
Published Date
1996-03
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center
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