Description of the plant communities and succession of the Oregon coast grasslands Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z029p717g

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  • In an effort to describe the plant communities and succession of the Oregon coastal grasslands, vegetation and environmental data were collected from 75 stands at 24 separate locations ranging from Cape Falcon in Tillamook County to Cape Ferrelo in Curry County. The vegetation data consisted of cover and frequency values for vascular plants and the environmental data included wind and salt spray exposure measurements, slope, aspect and a variety of soil properties. The vascular flora encountered consisted of 249 specific and intraspecific native and introduced taxa representing 166 genera and 55 families. An annotated catalogue of the flora was prepared. The vegetation data were analyzed using detrended correspondence analysis (DCA) and the TWINSPAN clustering program. These multivariate analyses served as the basis for the classification of the vegetation into seven community types (Carex obnupta, Calamagrostis nutkaensis/Elymus glaucus, Heracleum lanatum/Vicia gigantea, Lomatium martindalei/Koeleria cristata, Danthonia californica/Aira caryophyllea, Holcus lanatus/ Anthoxanthum odoratum and Fragaria chiloensis/Armeria maritima). Using correlations of the DCA scores with environmental variables, the first DCA axis was interpreted as representing a moisture gradient while the second DCA axis was interpreted as representing a latitudinal gradient. Vegetation data were collected from paired transects on grazed and ungrazed grasslands along fence lines in an effort to determine compositional changes with grazing. It was concluded that grazing led to a decrease in shrub cover and substantial increases in the number and cover of annual taxa. Documentation of successional changes in the grassland vegetation was obtained from historical written accounts and photographs. It was concluded that the Oregon coastal grasslands are undergoing a succession to shrub and tree dominated communities due largely to the exclusion of fire.
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  • File scanned at 300 ppi (Monochrome, 24-bit Color) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2013-07-22T19:54:56Z No. of bitstreams: 1 RipleyJamesD1984.pdf: 10104896 bytes, checksum: cec17d8e46678163ff73e1c6f16430be (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-22T20:54:24Z (GMT) No. of bitstreams: 1 RipleyJamesD1984.pdf: 10104896 bytes, checksum: cec17d8e46678163ff73e1c6f16430be (MD5)
  • description.provenance : Made available in DSpace on 2013-07-31T15:58:49Z (GMT). No. of bitstreams: 1 RipleyJamesD1984.pdf: 10104896 bytes, checksum: cec17d8e46678163ff73e1c6f16430be (MD5) Previous issue date: 1983-12-14
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-31T15:58:49Z (GMT) No. of bitstreams: 1 RipleyJamesD1984.pdf: 10104896 bytes, checksum: cec17d8e46678163ff73e1c6f16430be (MD5)

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