Graduate Thesis Or Dissertation
 

Vegetation changes in the Willamette River Greenway, Benton and Linn Counties, Oregon, 1972-1981

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3j333513j

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  • The nature and extent of niparian vegetation change from 1972 to 1981 in the Willamette River Greenway in Benton and Linn Counties, Oregon was quantitatively investigated. The study was primarily by aerial imagery analysis and associated field verification. A classification of vegetation and land cover within the study area was developed and employed in imagery interpretation. Vegetation cover within the Greenway based on this classification was mapped at a scale of 1:12,000 using 1981 color infrared and 1976 natural color imagery. Two additional sets of working maps, each consisting of 29 sheets, were prepared from 1972 and 1981 airphoto coverage respectively. Each set portrayed total vegetation cover, agricultural cover, and urban/industrial cover. Comparison of the two sets of maps facilitated completion of a single set of vegetation and land cover change maps depicting loss of vegetation at the expense of gains in agricultural and urban/industrial cover within the Greenway. Area in vegetation, agriculture, and urban/industrial development was measured for 1972 and 1981 for Benton and Linn Counties and change in each category determined. In Benton County a total loss of 436 acres of vegetation within the Greenway was found. This is about 8% of the total Benton County Greenway area of 5,505 acres. In Linri County the total loss was 290 acres which amounts to about 4% of the total Linn County Greenway area of 7,308 acres. Of the total Greenway vegetation lost in both counties, 60% was in Benton County and 40% was in Linn County. No gain in vegetation in the Willainette River Greenway was observed. A net loss of vegetation to agriculture and development was found in each county.
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file details Wickramaratne_Siri_Nimal_1983.pdf 2017-08-08 Pubblico Scaricare