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Effects of Timber Harvest on Stream Chemistry and Dissolved Nutrient Losses in Northeast Oregon

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Streamwater chemistry and nutrient inputs and outputs of four small (24 to 118 ha) catchments in the Blue Mountains of eastern Oregon were compared before and after timber harvest treatments. Three harvested watersheds were also compared to a control watershed. Treated watersheds included 41% clearcut in two large blocks; 17% clearcut in 0.8- to 2.4-ha patches; and selection harvest. Residues were piled and burned on the watersheds with clearcuts; on the selection harvest watershed, residues were yarded to an area off-site and burned. Chemical parameters and constitutents measured were: pH, electrical conductivity (EC), nitrate-N (NO3-N), dissolved Kjeldahl N (DKN), total dissolved PO4-P (TDP), calcium (Ca), magnesium (Mg), sodium (Na), and potassium (K). Nitrate-N concentrations in streamflow increased in response to both clearcutting treatments. The maximum level observed (0.52 mg/l) was, however, far below the maximum allowable for drinking water standards (10 mg/l). Concentration of TDP increased significantly on the 41% clearcut watershed and small but significant increases in cation concentrations were observed with both clearcutting treatments. Outputs (kg · ha-t · yr-1) of N increased with both clearcutting treatments but losses were balanced by precipitation inputs. Cation outputs were not affected by harvest treatments. For. Sci. 34(2):344-358.

Keywords: Water quality; forest streams; precipitation chemistry; site productivity; soil nutrients

Document Type: Journal Article

Affiliations: Chemist, Pacific Northwest Research Station, Forestry Sciences Laboratory, Wenatchee, WA 98801

Publication date: 1988-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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