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Assessment of river water quality during snowmelt and base flow periods in two catchment areas with different land use

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/33858

Title: Assessment of river water quality during snowmelt and base flow periods in two catchment areas with different land use
Authors: Woli, Krishna Prasad Browse this author
Hayakawa, Atsushi Browse this author
Kuramochi, Kanta Browse this author
Hatano, Ryusuke Browse this author →KAKEN DB
Keywords: eutrophication
impact factor
land use
mole ratio
nitrogen
phosphorus
silica
spring snowmelt
summer base flow
Issue Date: Feb-2008
Publisher: Springer Netherlands
Journal Title: Environmental Monitoring and Assessment
Volume: 137
Issue: 1-3
Start Page: 251
End Page: 260
Publisher DOI: 10.1007/s10661-007-9757-4
PMID: 17503203
Abstract: River water quality was evaluated with respect to eutrophication and land use during spring snowmelt and summer base flow periods in Abashiri (mixed cropland–livestock farming) and Okoppe (grassland-based dairy cattle farming), eastern Hokkaido, Japan. Water from rivers and tributaries was sampled during snowmelt and summer base flow periods in 2005, and river flow was measured. Total N (TN), NO3-N, and Si concentrations were determined using standard methods. Total catchment and upland areas for each sampling site were determined with ArcGIS hydrology modeling software and 1:25 000-scale digital topographic maps. Specific discharge was significantly higher during snowmelt than during base flow. In both areas, TN concentrations increased, whereas Si concentrations decreased, with increased specific discharge, and were significantly higher during snowmelt. The Si:TN mole ratio decreased to below or close to the threshold value for eutrophication (2.7) in one-third of sites during snowmelt. River NO3-N concentrations during base flow were significantly and positively correlated with the proportion of upland fields in the catchment in both the Abashiri (r = 0.88, P < 0.001) and Okoppe (r = 0.43, P < 0.01) areas. However, the regression slope, defined as the impact factor (IF) of water quality, was much higher in Abashiri (0.025) than in Okoppe (0.0094). The correlations were also significantly positive during snowmelt in both areas, but IF was four to eight times higher during snowmelt than during base flow. Higher discharge of N from upland fields and grasslands during snowmelt and the resulting eutrophication in estuaries suggest that nutrient discharge during snowmelt should be taken into account when assessing and monitoring the annual loss of nutrients from agricultural fields.
Rights: The original publication is available at www.springerlink.com
Relation: http://www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/33858
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Krishna Prasad Woli

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