NO_3-N and δ^<15>N Values of Water in the Tamagawa River

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  • 多摩川流域河川における硝酸態窒素濃度およびδ^<15>N値について
  • タマガワ リュウイキ カセン ニ オケル ショウサンタイ チッソ ノウド オヨビ デルタ 15Nチ ニ ツイテ

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The concentration of inorganic nitrogen and δ^<15>N values of NO_3-N in the Tamagawa River were measured. In the upper stream of the river, the concentration of NO_3-N and δ^<15>N values were low since the nitrogen origin was considered to be coming from rainfall and forestry soil. But the Nogawa and Senkawa rivers, which rise as spring water from the plain, contained high NO_3-N and δ^<15>N values in their upper streams as compared to other rivers. The NO_3-N concentration and δ^<15>N values of the river water became higher, especially as the water mixed with the filtrated sewage water which flowed down from several sources to several river points, with δ^<15>N values of more than +10‰. Ammonium nitrogen had been detected in one of the rivers (i.e., Senkawa River), but was rapidly decreased by nitrification as the water flowed down stream.

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