Effects of residence time and nutrient load on eutrophic conditions and phytoplankton variations in agricultural reservoirs

Mitsuyo Saito, Shin Ichi Onodera, Yuta Shiimizu

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

1 Citation (Scopus)

Abstract

The effects of residence time and nutrient load on eutrophic conditions and phytoplankton variations were examined on six ponds highly influenced by agricultural activity in western Japan. Estimated residence times ranged from 7 to 2348 days, which decreased from summer to winter. The nutrient condition was totally in a N-rich and P-limited condition compared with the Redfield ratio in both summer and winter. The estimated budget of DIN, DIP and dissolved silica (DSi) suggests that the ponds acted as a sink of nutrients to the downstream environment throughout the year. Fluorescence was clearly higher in the shorter residence time ponds. It suggests that cyanobacteria with relatively low chlorophyll content were dominant in the longer residence time while other phytoplankton was dominant in the shorter residence time. The opposite trend in residence time and fluorescence from August to December suggests that the dominant primary producer changed from cyanobacteria to diatoms.

Original languageEnglish
Title of host publicationUnderstanding Freshwater Quality Problems in a Changing World - Proceedings of Symposium H04
PublisherIAHS Press
Pages197-203
Number of pages7
ISBN (Print)9781907161391
Publication statusPublished - Jan 1 2013
Event2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World - Gothenburg, Sweden
Duration: Jul 22 2013Jul 26 2013

Publication series

NameIAHS-AISH Proceedings and Reports
Volume361
ISSN (Print)0144-7815

Other

Other2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World
CountrySweden
CityGothenburg
Period7/22/137/26/13

Keywords

  • Agricultural reservoirs
  • Eutrophic condition
  • Nutrient load
  • Phytoplankton
  • Residence time

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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  • Cite this

    Saito, M., Onodera, S. I., & Shiimizu, Y. (2013). Effects of residence time and nutrient load on eutrophic conditions and phytoplankton variations in agricultural reservoirs. In Understanding Freshwater Quality Problems in a Changing World - Proceedings of Symposium H04 (pp. 197-203). (IAHS-AISH Proceedings and Reports; Vol. 361). IAHS Press.