Precipitation chemistry sampling and analysis was initiated in both of these legacy studies at the Coyote Creek and Fox Creek watersheds in 1969 and concluded in 1981. Precipitation samples were collected as a composite sample over a three week period. Water samples were analyzed at what is now called the Cooperative Chemical Analytical Lab (CCAL) at Oregon State University. Concentrations of analytes include dissolved and particulate nitrogen and phosphorus, pH, conductivity, suspended sediment, and a full suite of cations and anions. Fluxes are calculated using nutrient concentrations and precipitation totals over the collection period. This work was funded by the U.S. Forest Service Pacific Northwest Research Station.
Donald L. Henshaw, Julia A. Jones, R. Dennis Harr, Richard L. Fredriksen, Sherri L. Johnson
The original objective was to examine the nutrient budgets for small watersheds through measurement on nutrient input through precipitation and output through streamflow. Nutrient budgets were then to be evaluated for changes in average concentrations and fluxes following timber harvest in adjacent treated and control watersheds.