書誌事項
- タイトル別名
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- Human impact on nitrogen concentration of streams and rivers in Nagano Prefecture
- ナガノケン ニ オケル ケイリュウスイ カセンスイ ノ チッソ ノウド ニ オヨボス ニンゲン カツドウ ノ エイキョウ
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<p>Nitrate was the dominant form of dissolved nitrogen in stream waters in Nagano Prefecture. Nitrate concentration showed a large geographical variation, ranging from 0.02 to 1.20 mg N L-1. Although there are significant negative relationships between nitrate concentration and altitude or annual precipitation, artificial influence accompanying with rainfall has not yet been confirmed on nitrate concentration in stream waters in Nagano Prefecture. In the Chikuma and Tenryu Rivers, dissolved organic nitrogen was observed in addition to the dominant nitrate. Dissolved total nitrogen concentration was around 1.5 mg N L-1 in the middle part of the both rivers. Nitrogen stable isotope ratio of periphyton increased downstream in the Chikuma River, whereas it was high in the upper reach and then decreased downstream in the Tenryu River. Nitrogen sources might shift from agricultural and mountain origins to sewage and livestock waste in the Chikuma River. Nitrogen derived from a sewage treatment system mainly contributed to the river nitrogen in the upper reach of the Tenryu River.</p>
収録刊行物
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- 日本水文科学会誌
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日本水文科学会誌 36 (3), 117-122, 2006
日本水文科学会
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詳細情報 詳細情報について
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- CRID
- 1390001288107224448
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- NII論文ID
- 10017953361
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- NII書誌ID
- AA11123427
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- ISSN
- 18837166
- 13429612
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- NDL書誌ID
- 8516603
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可