Precipitation and dry deposition chemistry concentrations and fluxes, Andrews Experimental Forest, 1969 to present

  • PI: Sherri L. Johnson
  • Originator: Richard L. Fredriksen
  • Other researchers: Stanley V. Gregory, Julia A. Jones, Kate Lajtha
  • Dates of data collection: Oct 1 1968 - May 4 2016
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • Access constraint:
  • Last update: Oct 31 2016 (Version 19)
<Citation>     <Acknowledgement>     <Disclaimer>    
Johnson, S.; Fredriksen, R. 2016. Precipitation and dry deposition chemistry concentrations and fluxes, Andrews Experimental Forest, 1969 to present. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: (27 June 2017) DOI:
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 1440409), 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.
Collection and analyses of precipitation chemistry were initiated in 1969 at the low-elevation Primary Met site, and in 1973 at a mid-elevation Hi-15 site. Rain collection samples accumulate from one week to three weeks in bulk and NADP type collectors and then are transported to Cooperative Chemical Analytical Laboratory (CCAL) for analysis. Analytes include nitrogen, phosphorus, carbon, and cations and anions as well as pH, conductivity, alkalinity and particulate sediment. Concentration and volume of precipitation are combined for inflow. Dry deposition chemistry concentrations began in 1989 and are analyzed 2-4 times per year at one site. The original objectives were to evaluate precipitation chemistry inputs versus chemistry outputs in streamflow from forested watersheds. The study has evolved into a general monitoring effort for precipitation chemistry that is among the least contaminated of any within the USA. This study is conducted in conjunction with Andrews streamflow chemistry (CF002) and the U.S. National Atmospheric Deposition Program (NADP).

Study Description Study Site Map Download Study Location Information: (CSV)
Download Full Documentation: (PDF)(EML)
1Precipitation water sample nutrient concentrations (Oct 1 1968 - May 4 2016)METADATADATA
Precipitation samples are collected and analyzed on a 3-week basis for nutrient concentrations. Precipitation amounts for each sampling period are provided.
2Precipitation water nutrient inflow in kg/ha (Oct 1 1968 - May 4 2016)METADATADATA
Derived nutrient inputs based on precipitation nutrient concentration data (Entity 1) and actual precipitation for the sampling period.
3Precipitation water nutrient mean annual concentrations (Oct 1 1968 - Oct 1 2015)METADATADATA
Mean annual precipitation nutrient concentrations are calculated from the concentration data (Entity 1).
6Precipitation water sample log sheet: field and laboratory comments (Oct 9 1968 - May 4 2016)METADATADATA

 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.

 Stream chemistry concentrations and fluxes using proportional sampling in the Andrews Experimental Forest, 1968 to present (CF002)

 Fredriksen, R. L. 1972, Nutrient budget of a Douglas-fir forest on an experimental watershed in western Oregon (Pub. No: 419)
 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)
 Martin, C. Wayne, Harr, R. Dennis 1988, Precipitation and streamwater chemistry from undisturbed watersheds in the Cascade Mountains of Oregon (Pub. No: 863)
 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)
 Vanderbilt, Kristin L. 2000, Patterns of nitrogen fluxes in watersheds of the H.J. Andrews Experimental Forest, OR (Pub. No: 2797)
 Vanderbilt, Kristin L., Lajtha, Kate, Swanson, Frederick J. 2002, Biogeochemistry of unpolluted forested watersheds in the Oregon Cascades: temporal patterns of precipitation and stream nitrogen fluxes (Pub. No: 3091)
 Johnson, Sherri L., Swanson, Frederick J., McGuire, Kevin, Jones, Julia A., Harmon, Mark 2003, Experimental watersheds, nutrient dynamics and collaborative research [Abstract] (Pub. No: 3669)
 Lajtha, Kate, Jones, Julia 2013, Trends in cation, nitrogen, sulfate and hydrogen ion concentrations in precipitation in the United States and Europe from 1978 to 2010: a new look at an old problem (Pub. No: 4807)