讃岐山脈を源流とする吉田川の上流域における窒素の分布

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  • The nitrogen concentrations in the upper reaches of the Yoshida River located the Sanuki Mountain Range
  • サヌキ サンミャク オ ゲンリュウ トスル ヨシダガワ ノ ジョウリュウイキ ニ オケル チッソ ノ ブンプ

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n the upper reaches of the Yoshida River where the nitrogen concentration in headwaters was high, the distribution of nitrogen and major ions were clarified. About 70% of total nitrogen was NO₃⁻‐N. NO₃⁻‐N was the highest concentration of 2.1mg/l in headwaters. Its concentrations in the down stream in the investigation area were about 1mg/l. The major ion concentrations showed the reverse tendency with NO₃⁻‐N. NO₃⁻‐N was higher, as the forest rate in the catchment was higher. This result shows that in the upper reaches of the Yoshida River, the nitrogen load from the forest had a greater impact on nitrogen concentration of the river.

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