Stream chemistry concentrations and fluxes using proportional sampling in the Andrews Experimental Forest, 1968 to present

  • Creator(s): Sherri L. Johnson, Richard L. Fredriksen
  • PI(s): Sherri L. Johnson
  • Originator(s): Richard L. Fredriksen
  • Other researcher(s): Julia A. Jones, Alba Argerich, Kate Lajtha, Stanley V. Gregory
  • Dates of data collection: Oct 2 1968 - May 22 2019
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • DOI:
  • Last update: Sep 19 2019 (Version 23)
<Citation>     <Acknowledgement>     <Disclaimer>    
Johnson, S.; Fredriksen, R. 2019. Stream chemistry concentrations and fluxes using proportional sampling in the Andrews Experimental Forest, 1968 to present. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2024-05-21.
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.
Stream chemistry sampling and analysis was initiated at the H.J. Andrews Experimental Forest in 1968 in two small watersheds (Watersheds 9,10). Sampling has expanded as additional paired watershed studies (Watersheds 1, 2, 6, 7, 8) and monitoring (Mack, Lookout Cr) were initiated over time. Water samples are collected proportionally to streamflow as a function of stage height and composited at each stream gauging site. Composite sample periods are generally three weeks and 3 one-week samples are commonly composited in the lab before analysis. Water samples are analyzed at the Cooperative Chemical Analytical Lab (CCAL) ( ). Concentrations of analytes include dissolved and particulate nitrogen, phosphorus, carbon, as well pH, conductivity, suspended sediment, and full suite of cations and anions. Monthly and annual mean concentrations are calculated by weighting 3-week periods by streamflow. Fluxes are calculated using concentrations and flow. The original objective was to examine the nutrient budgets for small watersheds and to evaluate changes in average concentrations and fluxes following timber harvest in comparison with unharvested reference watersheds. This study is conducted in conjunction with Andrew's precipitation chemistry (CP002) and the U.S. National Atmospheric Deposition Program (NADP).

Study Description Study Site Map Download Study Location Information: (CSV)
Ecological Metadata Language: (EML)
1Proportional stream water sample nutrient concentrations (Oct 1 1968 - May 22 2019)METADATADATA
This is the raw proportional sample concentration data collected periodically (usually every three weeks). Please see mean monthly concentration data provided in entity 2.
2Stream water nutrient mean monthly concentrations (Oct 1 1968 - Oct 1 2018)METADATADATA
3Stream water nutrient mean annual concentrations (Oct 1 1968 - Oct 1 2018)METADATADATA
4Stream water nutrient monthly outflow (kg/ha) (Oct 1 1968 - Oct 1 2018)METADATADATA
5Stream water nutrient outflow (kg/ha) for each proportional sampling interval (Oct 1 1968 - Oct 1 2018)METADATADATA
Data are calculated outflow fluxes for each proportional sample period. Alternatively, please consider use of monthly outflow fluxes provided in entity 4.
6Stream water sample log sheet: field and laboratory comments (Oct 9 1968 - Jun 30 2022)METADATADATA

 Watershed Descriptions - Descriptions of watershed characteristics including location, geology, soils, hydrology, vegetation, climate and history.
 The Cooperative Chemical Analytical Laboratory (CCAL) - The CCAL web page describes analytical methodology, detection levels and instrumentation. CCAL is a cooperative laboratory operated by Oregon State University and the U.S. Department of Agriculture, Forest Service.
 Proportional water sampling system - Description of the Sigma sampler and proportional water sampling system (2003-Present)
 Sampling program - Detailed 1988 memo describing changes in the stream and precipitation sampling program
 History of laboratory instrumentation - A table showing the history of laboratory instrumentation for analytical measurements
 Silica data quality - Silica data quality, 1969-1983
 Photographs of original sampler components - Fredriksen 1968 photographs of sampler - see Fredriksen 1969 (Pub 373) below
 StreamChemDB - Cross site stream chemistry database

 Precipitation chemistry concentrations and fluxes, HJ Andrews Experimental Forest, 1969 to present (CP002)
 Stream discharge in gaged watersheds at the HJ Andrews Experimental Forest, 1949 to present (HF004)
 Stream, hyporheic, and ground water chemistry of McRae Creek in the Andrews Experimental Forest, 1989 to 1992 (CF004)
 Storm nutrient dynamics at Andrews Experimental Forest stream gages, 2001 to 2003 (CF006)
 Stream specific conductance and temperature from small watersheds in the Andrews Forest (CF012)

 Argerich, Alba, Haggerty, Roy, Johnson, Sherri L., Wondzell, Steve M., Dosch, Nicholas, Corson-Rikert, Hayley, Ashkenas, Linda, Robert, Pennington, Thomas, Christoph K. 2016, Comprehensive multiyear carbon budget of a temperate headwater stream (Pub. No: 4929)
 Baek Soo Lee, Kate Lajtha 2016, Hydrologic and forest management controls on dissolved organic matter characteristics in headwater streams of old-growth forests in the Oregon Cascades (Pub. No: 4946)
 Lee, Baek Soo P. 2015, Hydrologic and Land Cover Effects on Sources and Fate of In-Stream Fluorescent Dissolved Organic Matter (Pub. No: 4937)
 Corson-Rikert, Hayley A. 2014, Carbon Dynamics in the Hyporheic Zone of a Headwater Mountain Stream in the Cascade Mountains, Oregon (Pub. No: 4862)
 Argerich, A., Johnson, S.L., Sebestyen, S.D., Rhoades, C.C., Greathouse, E., Knoepp, J.D., Adams, M.B., Likens, G.E., Campbell, J.L., McDowell, W.H., Scatena, F.N., Ice, G.G. 2013, Trends in stream nitrogen concentrations for forested reference catchments across the USA (Pub. No: 4805)
 Vanderbilt, Kristin L., Lajtha, Kate, Swanson, Frederick J. 2003, Biogeochemistry of unpolluted forested watersheds in the Oregon Cascades: temporal patterns of precipitation and stream nitrogen fluxes (Pub. No: 3091)
 Vanderbilt, Kristin L. 2000, Patterns of nitrogen fluxes in watersheds of the H.J. Andrews Experimental Forest, OR (Pub. No: 2797)
 Martin, C. Wayne, Harr, R. Dennis 1989, Logging of mature Douglas-fir in western Oregon has little effect on nutrient output budgets (Pub. No: 974)
 Martin, C. Wayne, Harr, R. Dennis 1988, Precipitation and streamwater chemistry from undisturbed watersheds in the Cascade Mountains of Oregon (Pub. No: 863)
 Triska, Frank J., Sedell, James R., Cromack, Kermit, Jr. 1984, Nitrogen budget for a small coniferous forest stream (Pub. No: 1354)
 Sollins, P., Grier, C. C., McCorison, F. M., Cromack, K., Jr., Fogel, R., Fredriksen, R. L. 1980, The internal element cycles of an old-growth Douglas-fir ecosystem in western Oregon (Pub. No: 135)
 Grier, C. C., Cole, D. W., Dyrness, C. T., Fredriksen, R. L. 1974, Nutrient cycling in 37- and 450-year-old Douglas-fir ecosystems (Pub. No: 473)
 Fredriksen, R. L. 1972, Nutrient budget of a Douglas-fir forest on an experimental watershed in western Oregon (Pub. No: 419)
 Fredriksen, R. L. 1969, A battery powered proportional stream water sampler (Pub. No: 373)
 Lajtha, Kate 2000, Ecosystem nutrient balance and dynamics (Pub. No: 3072)
 Fredriksen, R. L., Moore, D. G. 1972, Nutrient retention, mobilization, and loss in undisturbed forest ecosystems on experimental watersheds at the H.J. Andrews Experimental Forest (Pub. No: 1780)