Nitrogen and Oxygen Isotope Composition of Nitrate in Stream Water of Fuji River Basin

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  • 富士川流域における渓流水中の硝酸イオンの窒素・酸素安定同位体比
  • フジガワ リュウイキ ニ オケル ケイリュウ スイチュウ ノ ショウサン イオン ノ チッソ ・ サンソ アンテイ ドウイタイヒ

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To identify the nitrate source and spatial distribution of nitrogen isotope values originated from forest and agricultural lands, fifty-seven stream water samples from Fuji River Basin were analyzed for nitrate concentration and nitrate-nitrogen (δ15N-NO3-) and oxygen (δ18O-NO3-) isotope values. The δ18O-NO3- showed that the nitrate originated through nitrification. These values were plotted against fraction of each land use category in the study catchments. The δ15N-NO3- was positively correlated with the fractions of agricultural and residential areas in the catchments. The increasing of δ15N-NO3- with fraction of agricultural area converged to 5.4‰ which was similar to a reported nitrate isotope value of groundwater at orchard area in Kofu-Basin. The increasing δ15N-NO3- with more than 1% residential area suggested that potential source of nitrate contamination was domestic aste water. An increase of δ15N-NO3- in the catchments with less than 98% forest area suggested the sources of nitrate contamination were thropogenic. The estimated value of δ15N-NO3- in forest catchment was 0.9±1.2‰.

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