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米須地下ダム流域における地下水硝酸性窒素濃度の動態について
https://doi.org/10.24514/0002001293
https://doi.org/10.24514/0002001293499267e4-5a4e-49c0-9d1c-488c061ce906
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
TRNIRE206_p195-208.pdf (961.1 KB)
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(c) 国立研究開発法人 農業・食品産業技術総合研究機構
National Agriculture and Food Research Organization, Japan |
| Item type | 紀要論文 / Departmental Bulletin Paper_03(1) | |||||||||||||||||||||||||||||||||||||
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| 公開日 | 2025-03-28 | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| タイトル | 米須地下ダム流域における地下水硝酸性窒素濃度の動態について | |||||||||||||||||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| タイトル | Dynamics of Nitrate Concentration in Groundwater of Reservoir Area of Komesu Subsurface Dam, Okinawa, Japan | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||||||||||||||||
| 言語 | jpn | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | article | |||||||||||||||||||||||||||||||||||||
| ID登録 | ||||||||||||||||||||||||||||||||||||||
| ID登録 | 10.24514/0002001293 | |||||||||||||||||||||||||||||||||||||
| ID登録タイプ | JaLC | |||||||||||||||||||||||||||||||||||||
| 著者 |
吉本, 周平
× 吉本, 周平
× 土原, 健雄
× 石田, 聡
× 今泉, 眞之
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| 抄録 | ||||||||||||||||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||||||||||||||||
| 内容記述 | Fluctuations of nitrate concentrations in groundwater and its major sources of nitrate in the Ryukyu limestone area, the southern part of Okinawa Island, are studied. The study area is located in Itoman City, which is one of satellite cities of Naha City. The long-term monitoring data on nitrate concentrations at 15 springs from 1990 to 2003 shows a decreasing trend from the mid-1990s, although they fluctuated greatly with precipitation. The emission factor method on the basis of agricultural statistical data is applied to estimate the nitrogen load to groundwater. The nitrogen loads from livestock manure and domestic wastewater monotonically increased from 1975, and, accordingly, the total load showed an increasing trend. However, the load from chemical fertilizer has been gradually decreasing after peaking in 1990 as the area under cultivation has decreased. The trend in the nitrate concentration corresponded only to that of the load from chemical fertilizer, leading to the hypothesis that chemical fertilizer most strongly affects the groundwater quality. Fluctuation of nitrogen loss is calculated from the data of nitrate concentration in groundwater and groundwater discharge to the sea, which is estimated by the parallel 10 tank models. The estimated nitrogen balance shows that the total nitrogen loss is nearly balanced with the sum of loads of chemical fertilizer and rainfall. The nitrogen dynamics in this area is simulated by the nitrogen flow models which consist of the parallel 10 tank models groundwater with nitrate leaching model (Kiho and Islum, 1995) on the hypothesis that chemical fertilizer is the major nitrogen source. The model result shows the approximate decreasing trend of nitrogen concentration in groundwater. | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| bibliographic_information |
ja : 農村工学研究所技報 en : Technical report of the National Institute for Rural Engineering 巻 206, p. 195-208, 発行日 2007-03-31 |
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| 出版者 | ||||||||||||||||||||||||||||||||||||||
| 出版者 | 独立行政法人農業食品産業技術総合研究機構農村工学研究所 | |||||||||||||||||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||||||||||||||||
| 出版者 | ||||||||||||||||||||||||||||||||||||||
| 出版者 | National Agriculture and Food Research Organization, National Institute for Rural Engineering | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| item_12_source_id_9 | ||||||||||||||||||||||||||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||||||||||||||||||||||||||
| 収録物識別子 | 1882-3289 | |||||||||||||||||||||||||||||||||||||
