2013 Fiscal Year Final Research Report
Estimation of nitrate use cost by woody plant
| Project/Area Number |
23658126
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Forest science
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| Research Institution | Kyoto University |
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Principal Investigator |
TOKUCHI Naoko 京都大学, フィールド科学教育研究センター, 教授 (60237071)
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| Co-Investigator(Kenkyū-buntansha) |
OSADA Noriyuki 北海道大学, 北方圏フィールド科学教育研究センター, 特任助教 (80400307)
KOYAMA Lina 京都大学, 情報学研究科, 准教授 (50378832)
FUJIMAKI Reiji 島根大学, 生物資源科学部, 助教 (90401695)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 窒素利用 / 窒素負荷 / 窒素飽和 |
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| Research Abstract |
Increase of N deposition has changed the major form of available N for plant from ammonium (NH4+) to nitrate (NO3-). There are the complicate processes to use NO3- comparing with the use of NH4+. It results in higher cost for the plant to use NO3-. To estimate the cost of N use we measured CO2 flux labeled by 14C under the different forms of available N. The ratio of CO2 fluxes to total photosynthesis were 8% for NO3- use vs 4% for NH4+ use by both of evergreen Quercus glauca and deciduous Quercus serrate. After three months cultivation under each form of available N source the root structures were not significantly different between N forms in both species. These results suggested that the cost of NO3 use by woody tree species was two times larger than NH4+ use. However, the difference in cost was not significant influences on the root structure.
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