| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
|
|---|
| Outline of Final Research Achievements |
Accretionary prisms are composed mainly of ancient marine sediment scraped from a subducting oceanic plate at a convergent plate boundary. Large amounts of anaerobic groundwater and natural gas, mainly methane (CH4) and nitrogen gas (N2), are present in the deep aquifers associated with an accretionary prism, but the origin of N2 is poorly understood. The present study demonstrated that N2 production through the anaerobic oxidation of organic matter by denitrifying bacteria is particularly prevalent in the deep aquifers of the accretionary prism. DNA analysis revealed the dominance of the genus Thauera, reported to be capable of nitrate reduction and denitrification using organic matter as electron donor under anaerobic conditions. The denitrifying bacteria may compete with the CH4-producing syntrophic consortium for organic matter in the accretionary prism sediments.
|
