Distribution, metabolism and budgets of nitrogen in Tokyo Bay
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- HATTORI Akihiko
- Ocean Research Institute, University of Tokyo
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- OHTSU Masae
- Ocean Research Institute, University of Tokyo
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- KOIKE Isao
- Ocean Research Institute, University of Tokyo
Bibliographic Information
- Other Title
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- 東京湾における窒素の分布,代謝と収支
- トウキョウワン ニ オケル チッソ ノ ブンプ タイシャ ト シュウシ
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Abstract
Data on distributions of various forms of nitrogen in the Tokyo Bay waters during a 3-year period (1979-1981) are summarized. Ammonium and nitrate concentrations range from 0 to 50 μM, and show substantial seasonal or sporadic variation. Temporal change in river runoff is primarily responsible for the latter. On the other hand, urea concentrations fall within a narrow range of 0.1 to 1 μM, and do not show any seasonal trend. In summer, particulate organic nitrogen (PON) accounts for more than 70% of total nitrogen in the surface layer, and it decreases with depth. In winter, PON is minor (ca. 10%), and all forms of nitrogen exhibit vertically uniform distributions. Nitrogen- 15 tracer experiments disclose that, on an average, ammonium supports 69% of phyto-plankton growth, nitrate 28% and urea 3%. The nitrogen once taken up by phyto-plankton is rapidly regenerated within the water column. Only a small fraction of PON produced in the surface layer reaches the sea floor. These findings are consistent with the estimate of nitrogen budget presented by Matsumoto (1979).
Journal
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- Chikyukagaku
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Chikyukagaku 17 (1), 33-41, 1983
The Geochemical Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680717506048
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- NII Article ID
- 110008679739
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- NII Book ID
- AN00141280
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- ISSN
- 21885923
- 03864073
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- NDL BIB ID
- 2575441
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed