Evaluation of the Impact of Paddy Fields on Stream Water Nitrogen Concentration in Central Hokkaido(Environment)
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概要
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We investigated the impact of paddy fields on stream water N concentration in the Sorachi and Kamikawa districts in central Hokkaido, Japan. Water sampling was carried out at the post-fertilization (PF), crop growing (CG), and post-harvest (PH) stages of paddy cropping (hereafter referred to as "seasons") in 2001. The proportion of the land use types in drainage basins was obtained from topographic maps. The results of land use analysis showed that the proportion of paddy fields tended to increase when the proportion of arable lands including upland fields and grass lands but excluding paddy fields, hereafter referred to as "upland" increased in Sorachi, but decreased in Kamikawa. Linear regression analysis indicated that the TN and NO_3^--N concentrations in stream water were significantly correlated with the proportion of upland in the drainage basins in all seasons. However, the TN concentration showed a significant correlation with paddy fields only during the paddy growing seasons (PF and CG seasons) but not during the PH season. The NO_3^--N concentration was no correlated with the proportion of paddy fields in all seasons, while the Org-N concentration showed a highly positive correlation with the proportion of paddy fields during the paddy growing seasons. Multiple regression analysis showed that the average TN concentration was significantly correlated with a combination of proportion of paddy fields, upland, and urban areas in Sorachi (r^2 = 0.84, p < 0.001) and with a combination of proportion of paddy fields and upland in Kamikawa (r^2 = 0.28, p < 0.05). The values of the partial regression coefficients or impact factors were much lower for paddy fields than those for upland in Kamikawa and Sorachi, respectively. It is concluded that although the distribution pattern of paddy fields and upland in the drainage basins was different in the two districts, the impact of paddy fields on N pollution in stream water was much lower than that of upland in both districts.
- 社団法人日本土壌肥料学会の論文
著者
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Woli Krishna
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:department Of Natural
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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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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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Lie Liang
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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Woli K
北大農
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Nagumo Toshiyuki
Center for Education and Research of Field Sciences, Faculty of Agriculture, Shizuoka University
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Woli Krishna
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)depart
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Nagumo T
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University:(present Office)facult
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Hatano Ryusuke
Laboratory Of Soil Science Faculty Of Agriculture Hokkaido University
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