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Ecological land units of Bear Creek watershed and their relationship to water quality

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  • During 1975 and 1976 a sedimentation study was conducted in the Bear Creek watershed, located in the southeastern corner of central Oregon's Crook County. A Rocky Mountain infiltrometer was used to simulate high intensity rainfall over 468 sedimentation plots. Rainfall and runoff were measured and a sample of the runoff was collected to determine the sediment potentials. The Bear Creek watershed was divided into eight ecological land units which were further refined into 14 tentative habitat types and four unclassified communities. These divisions are based upon an association table developed from vegetation and soil field data. One- and two-factor analysis of variance was used to analyze the differences within habitat types, between habitat types within a unit, and when appropriate, between treatments or ecological condition within the habitat type or unit. Tractor logging in the mixed forest unit caused a significant increase in soil loss. Non-forest units exhibited a high natural variability in sediment production within the site tended to override any differences that may have resulted from a management treatment. Significant differences that did occur appeared to be closely related to differences in soils or ecologic condition. Wildland watershed managerial implications are explored in the summary section.
  • KEY WORDS : Ecological Land Units, Bear Creek Watershed, Water Quality, Sediment Potential, Runoff, Watershed Management.
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  • The work upon which this report is based was supported by funds provided by the United States Department of the Interior, Office of Water Resources Research, as authorized under the Water Resources Research Act of 1964.
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