2015 Fiscal Year Final Research Report
Formation processes of phosphorus hot spot and its effect on biological production in coastal zones of enclosed bays
| Project/Area Number |
25241014
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental impact assessment
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| Research Institution | Hiroshima University |
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Principal Investigator |
Fukuoka Masato 広島大学, 総合科学研究科, 教授 (70117232)
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| Co-Investigator(Kenkyū-buntansha) |
ONODERA Shin-ichi 広島大学, 大学院総合科学研究科, 教授 (50304366)
YAMAMOTO Tamiji 広島大学, 大学院生物圏科学研究科, 教授 (40240105)
SATO Takaharu 広島大学, 大学院総合科学研究科, 准教授 (90196246)
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| Co-Investigator(Renkei-kenkyūsha) |
MIYAOKA Kunihide 三重大学, 教育学部, 教授 (70296234)
SHIMIZU Yuta 農業・食品産業技術総合研究機構, 西日本農業研究センター, 特別研究員 (50625829)
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| Research Collaborator |
SAITO Mitsuyo
JIN Guangzhe
TAKEUCHI Toru
KITAOKA Koichi
JIGE Mayumi
MARUYAMA Yutaka
TOMOZAWA Yusuke
SENDA Satoshi
FUJITA Kazuo
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | リン / ホットスポット / 沿岸域 / 堆積物 / 地下水 / 気候変動 / 人間活動 |
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| Outline of Final Research Achievements |
In the present research, we aimed to evaluate the formation of phosphorus hot spot and its effect on nutrient cycle and biological production in coastal subsurface zone of enclosed bays. Long-term analysis of phosphorus accumulation in the coastal sediment of Seto Inland Sea indicates that phosphorus discharge from land to sea increased from 8,000 to 6,000 years ago by significant warming impact. In addition,the peaks of phosphorus accumulation were detected in 1970s in coastal sediments of enclosed bays. The catchment model (SWAT) simulation suggested intensive phosphorus supply to the coastal zone due to human activities.These two types of hot spots affected to phytoplankton broom in 2,000 years ago of the period when the sea receded, and to biological production in present, respectively.The transports from these hot spots to the sea were conducted by groundwater flow under a reducing environment.
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| Free Research Field |
資源物質循環学
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