埼玉県櫛引台地の湧水により灌漑されている水田表面水の硝酸態窒素濃度およびδ^<15>N値の変化

概要

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The change of nitrate nitrogen concentration in the surface water of a paddy field irrigated with spring water flowing from the Kushibiki plateau in Saitama Prefecture was examined, and the δ^<15>N value was determined. 1) The average nitrate nitrogen concentration of irrigated spring water was 15.9 mg L^<-1>(range : 15.7-16.3 mg L^<-1>), and its corresponding δ^<15>N value was 8.5 %_0 (range : 8.3-9.1%_0). 2) The average nitrate nitrogen concentration and δ^<15>N value of the drainage water under the paddy field were 10.5 mg L^<-1> (range : 9.8-11.2 mg L^<-1>) and 10.4 %_0 (range: 9.83-14.11%_0), respectively. 3) It was estimated from the nitrate nitrogen concentration and δ^<15>N value that a major part of the nitrate nitrogen concentration in the irrigation water disappeared by denitrification in the paddy field.
社団法人日本土壌肥料学会の論文
1998-06-05