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Title Transcription
シマネケン コリョウチョウ ジャイケ ノ カンキョウ チシツ
Title Alternative
Environmental geology of Lake Jaike,Koryo-cho,Shimane Prefecture,Japan
File
language
jpn
Author
Mihara, Akito
Description
Geochemical amlyses of bottom sediments and cored samples have been carried out to evaluate environmental changes of the non-marine Lake Jaike of San'in district.Soils of surrounding areas and sediments of the Lake Jinzai of brachish environment are also examined for comparative study.Cored samples with 70cm length showed gradually increasing concentrations of arsenic(from 12 to 31 ppm),lead(from 24 to 31 ppm),zinc(from 95 to 144 Pppm),phosphorous(P_2O_5,from O.09 to O.28 wt%)and total iron(from 8.20 to 11.15 wt%)but with relatively consistent values in chromium(75-83 ppm)and thorium(11-12 ppm)suggesting that the variations were caused by environmental change related to the land modification.Abrupt projection of total sulfur(TS)contents in this profile is suggestive of an excess supply of common fertilizer such as sulfate ammonium,of which the event was coincident to an extinction of fishes in 1988.In contrast to the decline of TS,phosphorus increased steadily indicating switching of aglochemicals.
Journal Title
島根大学地球資源環境学研究報告
Volume
19
Start Page
47
End Page
55
ISSN
13439774
Published Date
2000-12-25
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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