Graduate Thesis Or Dissertation
 

Sediment potentials for selected ecological land units in central Oregon

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  • During the summers of 1975 and 1976 a sedimentation study was conducted in the Bear Creek watershed, located in the southeastern corner of Crook County, in central Oregon. The 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 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, based on an association table developed from vegetation and soils 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. In the non-forest units a high natural variability in sediment production within sites 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 were confounded by other factors, such as methodology or ecologic conditions.
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