TY - JOUR
T1 - Effects of physical and morphometric factors on nutrient removal properties in agricultural ponds
AU - Saito, M.
AU - Onodera, S.
AU - Okubo, Kenji
AU - Takagi, S.
AU - Maruyama, Y.
AU - Jin, G.
AU - Shimizu, Y.
N1 - Funding Information:
The present study was financially supported by Grants-in-Aid for Scientific Research from JSPS (Principal investigator: Shin-ichi ONODERA, Research project number: 25241028) and MEXT Grant-in-Aid for Science and Technology Human Resource Development (Program to Disseminate and Secure the Tenure Track System, Okayama University). We are also grateful to Mr Daiki Aritomi for his help in field observations in the study area.
Publisher Copyright:
© IWA Publishing 2015.
PY - 2015/12
Y1 - 2015/12
N2 - Effects of physical and morphometric factors on nutrient removal properties were studied in small agricultural ponds with different depths, volumes, and residence times in western Japan. Average residence time was estimated to be >15 days, and it tended to decrease from summer to winter because of the increase in water withdrawal for agricultural activity. Water temperature was clearly different between the surface and bottom layers; this indicates that thermal stratification occurred in summer. Chlorophyll-a was significantly high (>20 μg/L) in the surface layer (<0.5 m) and influenced by the thermal stratification. Removal ratios of dissolved total nitrogen (DTN) and dissolved total phosphorus in the ponds were estimated to be 53-98% and 39-98% in August and 10-92% and 36- 57% in December, respectively. Residence time of the ponds was longer in August than in December, and DTN removal, in particular, was more significant in ponds with longer residence time. Our results suggest residence time is an important factor for nitrogen removal in small agricultural ponds as well as large lakes.
AB - Effects of physical and morphometric factors on nutrient removal properties were studied in small agricultural ponds with different depths, volumes, and residence times in western Japan. Average residence time was estimated to be >15 days, and it tended to decrease from summer to winter because of the increase in water withdrawal for agricultural activity. Water temperature was clearly different between the surface and bottom layers; this indicates that thermal stratification occurred in summer. Chlorophyll-a was significantly high (>20 μg/L) in the surface layer (<0.5 m) and influenced by the thermal stratification. Removal ratios of dissolved total nitrogen (DTN) and dissolved total phosphorus in the ponds were estimated to be 53-98% and 39-98% in August and 10-92% and 36- 57% in December, respectively. Residence time of the ponds was longer in August than in December, and DTN removal, in particular, was more significant in ponds with longer residence time. Our results suggest residence time is an important factor for nitrogen removal in small agricultural ponds as well as large lakes.
KW - Agricultural ponds
KW - Nutrient removal properties
KW - Physical and morphometric factors
KW - Residence time
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U2 - 10.2166/wst.2015.441
DO - 10.2166/wst.2015.441
M3 - Article
C2 - 26676006
AN - SCOPUS:84954543030
SN - 0273-1223
VL - 72
SP - 2187
EP - 2193
JO - Water Science and Technology
JF - Water Science and Technology
IS - 12
ER -