2014 Fiscal Year Final Research Report
Linkage between nitrogen and sulfur cycles by sulfur denitrification in a sulfide rich ecosystem
| Project/Area Number |
23780340
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Boundary agriculture
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 硫黄脱窒 / 微生物生態 / パイライト / 地質 / 窒素循環 / 硫黄循環 / 硫黄酸化細菌 / 生物地球化学 |
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| Outline of Final Research Achievements |
Most studies of denitrification have focused on organic carbon as an electron donor, but reduced sulfur can also support denitrification. Few studies have reported sulfur denitrificaion in ecosystems. The objectives of this study was to elucidate sulfur denitrification in sulfide rich ecosystems. (1) Both the signal of sulfur denitrificaion and the higher relative abundance of sulfur-oxidizing bacteria observed in the riverbed sediment in Akita Hachimantai clearly indicated that sulfur driven denitrificaion was occurred by sulfur-oxidizing bacteria. (2) Catchment topography and the distribution of electron donors in riverbed sediment explained the spatial variation in in-stream NO3- concentration and, by inference, catchment denitrification. The results indicate that more NO3- will be denitrified by sulfur-mediated denitrification as the abundance of sulfide in the catchment increases. (3) The signal of sulfur denitrificaion was also detected in the sediments in the Hachirogata polder.
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| Free Research Field |
生物地球化学
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