Assessing the impact of phosphorus cycling on river water P concentration in Hokkaido
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概要
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We estimated the phosphorus (P) budgets for all 212 cities, towns and villages of Hokkaido, Japan. We also carried out water sampling from all major rivers flowing in the respective areas during the snowmelt season and measured total P (TP) concentration. Surplus P in the agricultural land was estimated by subtracting the amount of crop uptake from the input sources, such as the amount of chemical and compost fertilizers, crop residues, rainfall and irrigation. The livestock excreta P not utilized on farmland was assumed to be disposed P. Total P concentrations in most of the river water ranged from undetectable to 1 mg L-1, rarely reaching up to 2.32 mg L-1, and the areas surrounding the Funka Bay had comparatively higher concentrations. More than two-thirds of the areas had surplus P in farmland ranging from negative values to 30 kg ha-1 of farmland, and areas with mixed farmland and livestock husbandry had higher surplus values ranging from 31 to 72 kg ha-1, indicating that the source of the residual P was applied chemical and manure fertilizers. Total P concentration in river water was not correlated with the proportion of upland field and urban area or with the farmland surplus P resulting from the P cycling and the municipal waste P that mixes into the river water. However, TP concentration was positively correlated with the proportion of Andisol area occupied by farmlands (r = 0.25, P < 0.01). The TP concentration was also correlated with the topographic factors in areas (r = 0.49, P < 0.01) that possess more than 50% Andisols in farmlands. Multiple regression analysis showed that TP concentration was best explained by a combination of disposed excreta, the Andisol area occupied by farmland, the application rate of chemical fertilizers and topographic factors (r2 = 0.21, P < 0.001). Thus, P losses from farmlands to river water during the snowmelt season could mainly be attributed to fertilizer management and soil type along with the topographic condition of the area.
- 社団法人日本土壌肥料学会の論文
著者
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石渡 輝夫
独立行政法人 北海道開発土木研究所
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Ishiwata Teruo
Civil Engineering Research Institute Hokkaido Development Bureau
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Woli Krishna
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:department Of Natural
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Ishiwata Teruo
Civil Engineering Research Institute For Cold Region Cold Region Agricultural Development Research G
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Woli K
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)depart
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Woli Krishna
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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HAYAKAWA Atsushi
Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University
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HATANO Ryusuke
Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University
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Woli Krishna
北大農院
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Hatano Ryusuke
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
Research Faculty Of Agriculture Hokkaido University
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Hayakawa Atsushi
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)depart
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Woli K
北大農
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NAGUMO Toshiyuki
Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University
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IMAI Hiromu
Civil Engineering Research Institute for Cold Region, Cold Region Agricultural Development Research
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Imai Hiromu
Civil Engineering Research Institute For Cold Region Cold Region Agricultural Development Research G
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Woli Krishna
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)depart
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石渡 輝夫
Civil Engineering Research Institute For Cold Region Cold Region Agricultural Development Research G
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Nagumo T
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)facult
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Nagumo Toshiyuki
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
Laboratory Of Soil Science Faculty Of Agriculture Hokkaido University
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