溪流两边的湿地对其含氮量的贡献

THE CONTRIBUTION OF WETLANDS TO STREAM NITROGEN LOAD IN THE LOCH VALE WATERSHED, COLORADO, USA

本文对美国科罗拉多洛基山国家公园内ＬｏｃｈＶａｌｅ，小流域溪流商边的湿地土壤水溶液中的含氮量进行了研究，并比较了与其相邻的溪流中的含氮量。结果发现，溪流中的硝态氮含量显著高于３个湿地土壤水溶液中的，而氨态氮则并没有显著差异；溪流水中的ｐＨ值要显著高于土壤水溶液中的，而电导率又显著低于后者。同时，还发现取自不同地点的溪流水分的化学性质也有显著的不同，采自溪流支流水分的ｐＨ，电导率和硝态氮都要显著高于取自主溪流中的水分的。另外，还分析比较了３个湿地样地的地上部分生产力以及土壤和生物量中的碳和全氮含量。最后，我们认为溪流两边的湿地对溪流中的氮的含量并没有显著的影响。

We explored the difference between the concentrations of different N forms and other chemical properties between stream water and riparian zone wetland soil water in the Loch Vale Watershed which is located on the eastern slope of the Continental Divide in Rocky Mountain National Park. Colorado, USA. The nitrate N concentrations in stream water were significantly higher than in the soil water of the three wetlands,while no significant difference appeared in ammonium N. The pH values were higher and conductivity values were lower in stream water than in wetland soil water. However, significant difference also appeared between nitrate N concentrations, pH and conductivity values in the water sampled from different positions of streams. The stream tributary water had higher nitrate N concentrations, higher pH and higher conductivity values. We also conducted experiments to compare the difference between the productivity, total N concentrations in biomass and soil of upper layers. At the end, we concluded that the wetlands distributed along the streams in Loch Vale Watershed had little effect on the nitrogen load of the stream water there.