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Effects of the Japanese Nitrate Directive Plan (NDP) to curb groundwater nitrate-nitrogen content in the Miyakonojo River basin
http://hdl.handle.net/10069/00041900
http://hdl.handle.net/10069/00041900a6440b09-2b1f-45da-8eb9-4d0421edd373
名前 / ファイル | ライセンス | アクション |
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JH615_128563.pdf (3.9 MB)
Download is available from 2024/10/26.
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-11-24 | |||||
タイトル | ||||||
タイトル | Effects of the Japanese Nitrate Directive Plan (NDP) to curb groundwater nitrate-nitrogen content in the Miyakonojo River basin | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Groundwater quality | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Nitrate-nitrogen | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Soil management | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Trend analysis | |||||
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 | journal article | |||||
著者 |
Yu, Zhi-Qiang
× Yu, Zhi-Qiang× Nakagawa, Kei× Berndtsson, Ronny× Hiraoka, Toru× Suzuki, Yoshihiro |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | There are urgent needs to evaluate different management techniques to improve groundwater quality. To maintain a good quality of groundwater in the iyakonojo River Basin (MRB), Japan, the Nitrate Directive Plan (NDP) was implemented in 2004. To assess the efficiency of this plan, we performed multivariate times-series analyses on 26 years (1996–2021) of groundwater nitrate-nitrogen (NO3−-N) data from up to 584 groundwater wells. Results showed that wells with an increasing NO3−-N trend (p ≤ 0.05) increased from 5.8% in 1996 to 13.8% in 2009 and thereafter leveled off with time. The number of groundwater wells with a decreasing NO3−-N trend (p ≤ 0.05) increased from 18.7% in 1996 to 52.5% in 2021. These groundwater wells are primarily distributed in urban and agricultural production areas near rivers. However, the annual change rate of NO3−-N content displayed both increasing and decreasing NO3−-N trend (p ≤ 0.05) over time. But most importantly, the number of groundwater wells exceeding the environmental maximum permissive value reduced by > 60% from 2004 to 2021. Thus, there is statistical evidence that NDP has improved the groundwater quality regarding NO3−-N at the regional basin scale and that nitrogen levels are gradually being reduced. | |||||
書誌情報 |
Journal of Hydrology 巻 615, p. 128563, 発行日 2022-10-27 |
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出版者 | ||||||
出版者 | Elsevier B.V. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00221694 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.jhydrol.2022.128563 | |||||
権利 | ||||||
権利情報 | ⓒ 2022 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Journal of Hydrology, 615, art. no. 128563; 2022 |