Soluble reactive phosphorus for the Kuparuk River near Toolik Field Station, Alaska 1983-current

Samples from designated stations from the Kuparuk River were collected during each summer from 1983 to current time. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference reach, a reach that had a recovery time of 1996-2010 and is now being refertilized, and a reach that has had phosphorus added since 1983. Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August.自1983年起至当前，研究团队于每年夏季采集库帕鲁克河（Kuparuk River）指定监测站点的样本。该实验自1983年起便开展磷素添加操作；各监测站的位置以1983年设置的初始磷素滴液器位置为基准，采用相对距离进行标定。监测站点涵盖三类河段：参照河段、1996-2010年处于恢复阶段且当前重新开展磷素添加的河段，以及自1983年起持续进行磷素添加的河段。实验向溪流中添加磷酸，以使可溶性活性磷（soluble reactive phosphorus）浓度提升0.32微摩尔。每年夏季共开展三次采样：分别为磷素添加启动前的6月、7月与8月各一次。