2011 Fiscal Year Final Research Report
Re-evaluation of gross primary production and respiration in coastal aquatic ecosystems based on water quality measurements of concentrations and stable isotopes
| Project/Area Number |
22710005
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
WATANABE Atsushi 東京工業大学, 大学院・情報理工学研究科, 助教 (00378001)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 物質循環 |
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| Research Abstract |
I measured respiration and gross primary productivity in the water during summer and winter period using conventional carbon dioxide system(CO_2 system) parameters and dissolved oxygen(DO) measurements as well as triple oxygen isotope technique in a coral reef, seagrass meadow, and mangrove forest which characterize subtropical and tropical coastal zones. From the results obtained, I revealed that the respiration rate was higher by tens of percent to two-hold in the light compared with in the dark. This indicates that the gross primary production and gross respiration calculated based on CO_2 system and/or DO methods give underestimations on these parameters. The respiration was also higher during summer than winter. But it was revealed that the'' photosynthetic anomaly'' which is used as a basis for calculating gross primary productivity can be incorrect or variable, and that we should further investigate this parameter to be able to calculate the respiration and gross primary production more accurately.
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