2010 Fiscal Year Final Research Report
Studies on environmental assessment technique on the estuarine ecosystems using multi-tracer
| Project/Area Number |
20310021
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Environmental impact assessment/Environmental policy
|
|---|
| Research Institution | National Institute for Environmental Studies |
|---|
Principal Investigator |
NOHARA SEIICHI National Institute for Environmental Studies, アジア自然共生研究グループ, 室長 (60180767)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HIROKI Mikiya 独立行政法人国立環境研究所, 生物圏環境研究領域, 主任研究員 (40142103)
INOUE Tomomi 独立行政法人国立環境研究所, アジア自然共生研究グループ, 研究員 (80435578)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| Keywords | 生態系影響評価 / 生態系サービス |
|---|
| Research Abstract |
Chemical analysis of river water and groundwater were carried out for the samples from Izu-Ohshima Island,Hachijyoujima Island and Ogasawara Islands from 1997 to 1999 and from 2005 to 2008. Concentrations of nitrate-N of inland water of Ogasawara Islands werter higher than those in summer. The analytical results show that nutnnt concentrations of the groundwater around the coastal area were increased from Ogasawara Islands to lzu Islands because of land use of agriculture and sewage water from human activity. The analytical results of nitrogen isotope ratio in seaweeds show that the nutrient supply from inland water was decreasing in Hachijyoujima Island. This indicates the importance of nutrient from groundwater seepage for seaweed vegetation in lzu Islands.
|
