アクセス数 : 1375 件
ダウンロード数 : 138 件
この文献の参照には次のURLをご利用ください : https://ir.lib.shimane-u.ac.jp/1999
島根大学農学部研究報告 Volume 25
published_at 1991-12-21
農業集水域からの汚濁物質流出特性(I) : 水質変動と流出負荷量
Pollution Loading Outflows from an Agricultural Basin(I) : Characteristics of Concentrations and Loadings
full_text_file
d0030025n016.pdf
( 747 KB )
Descriptions
Water qualities and discharge were monitored regularly in the agricultural basin during two irrigation periods and one non-irrigation period. The rate of paddy field in the basin changed within two irrigation periods, I.e. 36% (1988) and 45% (1989) due to conversion to upland field. The loadings were calculated onlyin the dry-weather days，bocause there was a little problem in measuing the discharge.
At the lowest end of the basin, the average concentrations of T-N, T-P and T-COD during the irrigation periods were 2.13mg/1 (1988) 1.68mg/1 (1989), 0.171mg/1 (1988) 0.399mg/1 (1989), and 2.5mg/1 (1988) 4.5mg/1 (1989) respectively. The tendency was found that the pollution loading outflows were higher than the inflow by irrgation. Furthermore ［0utflow loading］-［Inflow loading］during the irrigation period in 1989 were higher than 1988. This may be caused by the large amounts of loading from the paddy fields in the basin．
At the lowest end of the basin, the average concentrations of T-N, T-P and T-COD during the irrigation periods were 2.13mg/1 (1988) 1.68mg/1 (1989), 0.171mg/1 (1988) 0.399mg/1 (1989), and 2.5mg/1 (1988) 4.5mg/1 (1989) respectively. The tendency was found that the pollution loading outflows were higher than the inflow by irrgation. Furthermore ［0utflow loading］-［Inflow loading］during the irrigation period in 1989 were higher than 1988. This may be caused by the large amounts of loading from the paddy fields in the basin．
About This Article
Pages
Other Article