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.