Advisor

Richard R. Petersen

Date of Award

1-1-1983

Document Type

Dissertation

Degree Name

Doctor of Philosophy (Ph.D.) in Environmental Sciences and Resources

Department

Environmental Science and Management

Physical Description

2, xi, 113 leaves : ill.

Subjects

Paleolimnology -- Oregon -- Bull Run Lake, Paleontology, Freshwater ecology

DOI

10.15760/etd.98

Abstract

Detailed analysis of the physical, chemical, pollen and diatom stratigraphy of sediment cores from Bull Run Lake, Oregon reveals that the lake has been subject to repeated episodes of disruption by volcanic ash fall, fire and other disturbance over the past 4300 years. With the exception of fire, these disruptions have not resulted in long term changes in the watershed or in the characteristics of Bull Run Lake. A major fire in the watershed about 750 years ago altered the vegetation. Since that time the forest has been returning to its former condition.

Description

Portland State University. Environmental Science and Resources Ph. D. Program.

Persistent Identifier

http://archives.pdx.edu/ds/psu/4382

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