2022 Fiscal Year Final Research Report
Analysis of emission, diffusion and deposition processes of reactive nitrogen between soil and atmosphere using radioactive gases
| Project/Area Number |
20K12150
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Toyo University (2022)
Fukushima Medical University (2020-2021) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松田 和秀 東京農工大学, 農学部, 教授 (50409520)
和田 龍一 帝京科学大学, 生命環境学部, 教授 (90566803)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | ラドン |
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| Outline of Final Research Achievements |
The purpose of this study was to elucidate the release, diffusion and deposition processes of reactive nitrogen (ammonia and nitric oxide) between air and soil (forest floor) using radon. Vertical distribution observation was carried out at an observation tower installed in a Japanese cedar-conara mixed forest. Ammonia release from the forest floor was observed during both leaf-set and defoliation periods, but it was suggested that ammonia release from the forest canopy was not affected. The day and night results for nitric oxide showed that most of the nitrogen monoxide was released from the forest floor during both the leaf-set and leaf-shed periods. Observation results of radon confirmed that radon near the forest floor tends to be rate-limiting for material exchange between the forest and the forest floor, suggesting the possibility that it contributes to the factors that increase radon concentrations near the forest floor.
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| Free Research Field |
大気環境科学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、森林における反応性窒素（アンモニア、一酸化窒素）の動態を理解するため、鉛直濃度分布観測を行い、林床付近の高濃度化や森林樹冠への林床付近の反応性窒素の影響について見出した。反応性窒素は生態系において過剰窒素に伴う富栄養化に影響するとともに、粒子生成にも寄与するため大気汚染や気候変動にも影響する可能性がある。そのため、本研究成果は学術的意義や社会的意義は高い。
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