Regional Distribution of Natural Stream Nitrate in Central Japan
Regional Distribution of Natural Stream Nitrate in Central Japan
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日本中部自然流硝酸盐的区域分布
DOI：
10.1023/a:1013856729245
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Yagi
中科院分区：
文献类型：
--
作者：
M. Yoh;E. Konohira;K. Yagi
在日本中部调查了60多条有森林集水区的天然溪流的硝酸盐（NO3−）浓度。溪流NO3−浓度显示出明显的纬向梯度，其范围几乎高达100倍，其中它们的小季节变化（平均值）。CV = 27%）证明了各自的状态。NO3−浓度升高（超过70 µM）描述了氮饱和度沿着关东平原污染空气平流的分布。森林中NO3-淋溶的程度与大气氮沉降不成比例，这可能是因为生态系统的氮保留。NO3−水平依赖于流域海拔高度和相当恒定的δ 15 N流NO3−在一个广泛的NO3−范围内观察到，这也可能与此有关的原因。
Over 60 natural streams with forested catchments were surveyed for nitrate (NO3−) concentration in central Japan. Stream NO3−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 NO3−concentrations (more than 70 µM) described a distribution of N saturation along a course of polluted air advection in the Kanto Plain. The extent of NO3−leaching from forests was not proportional to atmospheric N deposition probably because of ecosystem N retention. A dependency of NO3−level on the watershed altitude and quite constant δ15N of stream NO3−over a wide NO3−range were observed, which could be also related to this cause.