| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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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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