Structural and functional comparison of human-impacted and natural forest landscapes in the western Cascades of Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bz60cz97p

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • This study compared effects of human and natural wildfire disturbance on age class distribution and associated ecosystem properties of forests in a 15,670 km2 area of the western Cascades of Oregon. The study site is characterized by three forest use types: low elevation, intensively harvested private industrial lands; mid elevation partially harvested public forest lands; and high elevation wilderness lands. Hypothetical landscapes were constructed, representing wildfire conditions, the current (1995) condition, and forest management strategies. The spatial pattern of forests in each landscape was depicted by the distribution of four forest age classes (0-30,31-80,81-200, and 201+ years). Wildfire-affected forests were simulated for 3000-year periods using an existing model with six alternate parameterizations obtained from fire history studies. Forest patterns on the 1995 landscape were obtained from classified remotely sensed imagery. Three landscapes representing hypothetical forest management strategies were constructed: 1) riparian buffers, 2) reserve allocations, and 3) multi-age rotation harvests. Forest age class amounts, spatial distribution, and arrangement were compared between wildfire-affected, 1995, and managed landscapes. Wood production, carbon storage, water yield, and species diversity of each landscape were evaluated using simple measures from empirical studies relating forest structural patterns to ecosystem properties. Comparison of the 1995 landscape with simulated wildfire-affected landscapes indicates that private industrial lands in 1995 had more young forest, whereas wilderness lands had more old forest, than most, or all, simulated wildfire conditions. Because private industrial and wilderness areas deviate from the range of natural (wildfire-affected) variability in opposite directions, the study area as a whole is within the probable range of natural variability over the past few millennia. Forest ages classes on public non-wilderness lands were within the range of simulated wildfire-affected landscapes. Ecosystem properties of the current and managed landscapes were within the range of variability of those properties in the simulated wildfire-affected landscapes. Given the caveats imposed by the simplistic assumptions, some ecosystem properties appear to be sensitive to the arrangement of forest age classes. Future studies would benefit from the use of structurally based, rather than age-based, forest classes, for evaluating forest pattern effects on ecosystem properties.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • Master files scanned at 600 ppi (24-bit Color and 256 greyscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (24-bit Color and 256 greyscale and 256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-22T18:11:53Z (GMT) No. of bitstreams: 1 Pennington_Deana_D_2002.pdf: 9082953 bytes, checksum: e7be99e6c5dd82d96a841c5e159fe7cf (MD5)
  • description.provenance : Made available in DSpace on 2008-07-22T18:14:06Z (GMT). No. of bitstreams: 1 Pennington_Deana_D_2002.pdf: 9082953 bytes, checksum: e7be99e6c5dd82d96a841c5e159fe7cf (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-22T18:14:05Z (GMT) No. of bitstreams: 1 Pennington_Deana_D_2002.pdf: 9082953 bytes, checksum: e7be99e6c5dd82d96a841c5e159fe7cf (MD5)
  • description.provenance : Submitted by Sara Mintonye (smscanner@gmail.com) on 2008-07-15T16:01:17Z No. of bitstreams: 1 Pennington_Deana_D_2002.pdf: 9082953 bytes, checksum: e7be99e6c5dd82d96a841c5e159fe7cf (MD5)

Relationships

In Administrative Set:
Last modified: 08/08/2017 Default
Citations:

EndNote | Zotero | Mendeley

Items