Dissolved nitrogen removal in the ponded streams of an alluvial, suburban basin with a developing city, western Japan

Yuta Shimizu, Shin Ich Onodera, Mitsuyo Saito, Yasuyuki Hirayama, Hidehiro Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This study aims to clarify the nitrate removal in a ponded stream with 12 pools, in western Japan. In the summer season, denitrification coincides with nitrate assimilation by phytoplankton in the pool. In addition, organic matter mineralization in sediment also occurs in summer. DN fluxes estimated on the main stream by the chloride ion balance method suggest nitrate has been removed within the pool. However, the estimated amount of nitrogen removed in each pool was quite different. The estimated amount removed was divided into denitrification and assimilation by the Redfield ratio. Consequently, it is suggested that assimilation by phytoplankton contributes significantly to removing dissolved nitrogen in the summer season, while denitrification contributes in autumn. Furthermore, the relationship between the amount of removed dissolved nitrogen, except for assimilation, and characteristics of pools, indicates that the removable amount of DN is larger in the pools characterized by large area, shallow depth or slow flow velocity.

Original languageEnglish
Title of host publicationIAHS-AISH Publication
Pages143-149
Number of pages7
Volume330
Publication statusPublished - 2009
Externally publishedYes
EventSymposium JS.3 at the Joint Convention of the International Association of Hydrological Sciences, IAHS and the International Association of Hydrogeologists, IAH - Hyderabad, India
Duration: Sep 6 2009Sep 12 2009

Other

OtherSymposium JS.3 at the Joint Convention of the International Association of Hydrological Sciences, IAHS and the International Association of Hydrogeologists, IAH
CountryIndia
CityHyderabad
Period9/6/099/12/09

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Keywords

  • Denitrification
  • River basin scale
  • Small reservoir

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Shimizu, Y., Onodera, S. I., Saito, M., Hirayama, Y., & Takahashi, H. (2009). Dissolved nitrogen removal in the ponded streams of an alluvial, suburban basin with a developing city, western Japan. In IAHS-AISH Publication (Vol. 330, pp. 143-149)