Cations for the Kuparuk River near Toolik Field Station, Alaska 1989-2000; 2011 to present.

Samples were collected and analyzed for the cations potassium, sodium, calcium, and magnesium. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Cation samples were analyzed some summers between 1989 to 2000 and 2011 to present on the Kuparuk River

本数据集采集并分析了钾、钠、钙、镁四种阳离子的样品。自1983年起，该研究区域开展了磷素添加实验；各监测站点的位置以其与1983年初始磷素滴施装置的相对距离进行标定。监测站点涵盖参考河段、恢复河段与施肥河段三类点位，河段的划分依据磷素添加的位置而定（详见方法部分）。实验通过向溪流中投加磷酸，将可溶性反应磷浓度提升0.32 μM。阳离子样品的采样分析时段为1989年至2000年的部分夏季，以及2011年至今，采样区域位于库帕鲁克河（Kuparuk River）。