Oxygen isotope analysis of phosphate toward reducing potential risks of water degradation in public waters in the hilly and mountainous area
Project/Area Number |
15K16115
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Environmental dynamic analysis
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Research Institution | Kyushu University |
Principal Investigator |
Ide Jun'ichiro 九州大学, 持続可能な社会のための決断科学センター, 助教 (70606756)
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Project Period (FY) |
2015-04-01 – 2018-03-31
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Project Status |
Completed (Fiscal Year 2017)
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Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 面減汚濁 / 富栄養化 / 安定同位体比 / 流出起源 / 流域 / McLaughlin法 / 水文条件 / 面源汚濁 |
Outline of Final Research Achievements |
This study sought to characterize oxygen isotope ratio of river phosphate (δ18Op) and examined dynamics of river phosphate in the hilly and mountainous area. River water samples were collected, and their δ18Op were analyzed in the hilly and mountainous, the urbanized and the agricultural flat areas. A comparison of δ18Op among the three areas showed that the mean δ18Op value was highest in the agricultural flat area, and was similar between the hilly and mountainous and the urbanized areas. Variability of δ18Op values during the observation period was larger in the hilly and mountainous area than in the other two areas. Additionally, δ18Op tended to converge to a low value as the antecedent precipitation index increased. It is predicted that river phosphate with low δ18Op was exported from upper forested areas into the downstream rivers particularly during high flow conditions in the hilly and mountainous area.
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Report
(4 results)
Research Products
(15 results)
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[Journal Article] Spatial variations in the molecular diversity of dissolved organic matter in water moving through a boreal forest in eastern Finland.2017
Author(s)
Jun’ichiro Ide, Mizue Ohashi, Katsutoshi Takahashi, Yuko Sugiyama, Sirpa Piirainen, Pirkko Kortelainen, Nobuhide Fujitake, Keitaro Yamase, Nobuhito Ohte, Mina Moritani, Miyako Hara, Leena Finer
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Journal Title
Scientific Reports
Volume: 7
Issue: 1
Pages: 42102-42102
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Comparisons of oxygen isotope ratio of phosphate in river water and rocks between two watersheds in central Japan2017
Author(s)
J. Ide, A. P. Cid-Andres, T. Ishida, K. Osaka, T. Iwata, T. Hayashi, M. Akashi, I. Tayasu, N. Okuda
Organizer
JpGU-AGU Joint Meeting 2017, Chiba, Japan
Related Report
Int'l Joint Research
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[Presentation] Biogeochemical cycling of phosphate in the Yasu River Watershed: Insight from oxygen isotope of phosphate2017
Author(s)
T. Ishida, Y. Uehara, T. Iwata, O. L. A. Privaldos, S. Asano, T. Ikeya, K. Osaka, J. Ide, I. Tayasu, N. Okuda
Organizer
JpGU-AGU Joint Meeting 2017, Chiba, Japan
Related Report
Int'l Joint Research
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[Presentation] Changes in the quality of dissolved organic matter in soil water with time since last fire in a boreal forest2016
Author(s)
J. Ide, M. Ohashi, K. Koster, F. Berninger, I. Miura, N. Makita, K. Yamase, J. Pumpanen
Organizer
EGU General Assembly 2016, Vienna, Austria, April 2016
Place of Presentation
Vienna, Austria
Related Report
Int'l Joint Research
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