期刊
WATER AIR AND SOIL POLLUTION
卷 130, 期 1-4, 页码 655-660出版社
SPRINGER
DOI: 10.1023/A:1013856729245
关键词
NO(3)(-); natural streams; nitrogen saturation; delta(15)N; attitude dependence.
Over 60 natural streams with forested catchments were surveyed for nitrate (NO(3)(-)) concentration in central Japan. Stream NO(3)(-) concentrations showed a clear zonal gradient with a range nearly as large as 100-fold, where their small seasonal variations (av. CV = 27%) justified respective statuses. Elevated NO(3)(-) concentrations (more than 70 muM) described a distribution of N saturation along a course of polluted air advection in the Kanto Plain. The extent of NO(3)(-) leaching from forests was not proportional to atmospheric N deposition probably because of ecosystem N retention. A dependency of NO(3)(-) level on the watershed altitude and quite constant delta (15)N of stream NO(3)(-) over a wide NO(3)(-) range were observed, which could be also related to this cause.
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