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

Woli, Krishna Prasad; Hayakawa, Atsushi; Kuramochi, Kanta; Hatano, Ryusuke

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

Woli, Krishna Prasad; Hayakawa, Atsushi; Kuramochi, Kanta et al.

Environmental Monitoring and Assessment, 2008, 137(1-3), 251-260

Permalink : https://hdl.handle.net/2115/33858

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アクセス権	open access
URI	https://hdl.handle.net/2115/33858
タイトル	Assessment of river water quality during snowmelt and base flow periods in two catchment areas with different land use
著者	Woli, Krishna Prasad ; Hayakawa, Atsushi ; Kuramochi, Kanta ; Hatano, Ryusuke
著者名 Woli, Krishna Prasad
著者名 Hayakawa, Atsushi
著者名 Kuramochi, Kanta
e-Rad_Researcher 40156344 著者名 Hatano, Ryusuke
言語	英語
キーワード	eutrophication
	impact factor
	land use
	mole ratio
	nitrogen
	phosphorus
	silica
	spring snowmelt
	summer base flow
発行日	2008-02
出版者	Springer Netherlands
収録物名	Environmental Monitoring and Assessment
巻(号)	137(1-3)
ページ	251-260
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	The original publication is available at www.springerlink.com
PISSN	0167-6369
EISSN	1573-2959
関連情報	PMID 17503203
関連情報	URI http://www.springerlink.com
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1007/s10661-007-9757-4