| Project/Area Number |
25282084
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geography
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| Research Institution | Nanzan University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
渡辺 信 琉球大学, 熱帯生物圏研究センター, 准教授 (10396608)
小野 賢二 国立研究開発法人森林総合研究所, その他部局等, 研究員 (30353634)
井上 智美 国立研究開発法人国立環境研究所, その他部局等, 研究員 (80435578)
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| Co-Investigator(Renkei-kenkyūsha) |
TANIGUCHI Shingo 琉球大学, 農学部, 教授 (80444909)
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| Research Collaborator |
TABUCHI Ryuichi
HIRAIDE Masakazu
OGAWA Tomomi
NISHINO Yumi
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2013: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| Keywords | マングローブ / 根生産量 / 地下部生産速度 / 地下部分解速度 / 窒素固定機能 / 立地環境 / ミクロネシア連邦ポンペイ島 / 西表島 / 植生・土壌 / バイオマス / 炭素固定 |
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| Outline of Final Research Achievements |
We examined fine roots accumulation and decomposition rates and nitrogen fixation ability for major mangrove species of Pohnpei Island in Micronesia and Iriomote Island. Fine roots accumulation rates were 40 to 50 t/ha/year in Pohnpei except inland sites of three species, which were around 25 t/ha, and 4 to 9 t/ha/year in Iriomote. Root litter residual ratios for a year were 40 to 85 % in Pohnpei except seaward site of Rhizophora stylosa, which was 8 %, and 50 to 60 % in Iriomote. Activation energy of nitrogen-fixing reaction was higher in rhizosphere than non-rhizosphere for all investigated trees. Nitrogen fixation activity in Pohnpei was highest compared with other regions.
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