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 language | English |
|---|---|
| Title of host publication | IAHS-AISH Proceedings and Reports |
| Publisher | IAHS Press |
| Pages | 197-203 |
| Number of pages | 7 |
| Volume | 361 |
| ISBN (Print) | 9781907161391 |
| Publication status | Published - 2013 |
| Event | 2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World - Gothenburg, Sweden Duration: Jul 22 2013 → Jul 26 2013 |
Other
| Other | 2013 Symposium H04: Understanding Freshwater Quality Problems in a Changing World |
|---|---|
| Country | Sweden |
| City | Gothenburg |
| Period | 7/22/13 → 7/26/13 |
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Keywords
- Agricultural reservoirs
- Eutrophic condition
- Nutrient load
- Phytoplankton
- Residence time
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
Cite this
Effects of residence time and nutrient load on eutrophic conditions and phytoplankton variations in agricultural reservoirs. / Saito, Mitsuyo; Onodera, Shin Ichi; Shiimizu, Yuta.
IAHS-AISH Proceedings and Reports. Vol. 361 IAHS Press, 2013. p. 197-203.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Effects of residence time and nutrient load on eutrophic conditions and phytoplankton variations in agricultural reservoirs
AU - Saito, Mitsuyo
AU - Onodera, Shin Ichi
AU - Shiimizu, Yuta
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Agricultural reservoirs
KW - Eutrophic condition
KW - Nutrient load
KW - Phytoplankton
KW - Residence time
UR - http://www.scopus.com/inward/record.url?scp=84900397026&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84900397026&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84900397026
SN - 9781907161391
VL - 361
SP - 197
EP - 203
BT - IAHS-AISH Proceedings and Reports
PB - IAHS Press
ER -