دورية أكاديمية
Regional Comparison of Nitrogen Export to Japanese Forest Streams
| العنوان: | Regional Comparison of Nitrogen Export to Japanese Forest Streams |
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| المؤلفون: | Hideaki Shibata, Koichiro Kuraji, Hiroto Toda, Kaichiro Sasa |
| المصدر: | The Scientific World Journal, Vol 1, Pp 572-580 (2001) |
| بيانات النشر: | Hindawi Limited, 2001. |
| سنة النشر: | 2001 |
| المجموعة: | LCC:Technology LCC:Medicine LCC:Science |
| مصطلحات موضوعية: | Technology, Medicine, Science |
| الوصف: | Nitrogen (N) emissions in Asian countries are predicted to increase over the next several decades. An understanding of the mechanisms that control temporal and spatial fluctuation of N export to forest streams is important not only to quantify critical loads of N, N saturation status, and soil acidification N dynamics and budgets in Japanese forested watersheds is not clear due to the lack of regional comparative studies on stream N chemistry. To address the lack of comparative studies, we measured inorganic N (nitrate and ammonium) concentrations from June 2000 to May 2001 in streams in 18 experimental forests located throughout the Japanese archipelago and belonging to the Japanese Union of University Forests. N concentrations in stream water during base flow and high flow periods were monitored, and N mineralization potential in soil was measured using batch incubation experiments. Higher nitrate concentrations in stream water were present in central Japan, an area that receives high rates of atmospheric N deposition. In northern Japan, snowmelt resulted in increased nitrate concentrations in stream water. The potential net N mineralization rate was higher in surface soil than in subsurface soil, and the high potential for N mineralization in the surface soil partly contributed to the increase in nitrate concentration in stream water during a storm event. Regional differences in the atmospheric N deposition and seasonality of precipitation and high discharge are principal controls on the concentrations and variations of nitrates in stream water in forested watersheds of Japan. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1537-744X |
| Relation: | https://doaj.org/toc/1537-744X |
| DOI: | 10.1100/tsw.2001.371 |
| URL الوصول: | https://doaj.org/article/2cde9b403805438f893acdaf83942fc6 |
| رقم الأكسشن: | edsdoj.2cde9b403805438f893acdaf83942fc6 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 1537744X |
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| DOI: | 10.1100/tsw.2001.371 |