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Current status and recent trends of palustrine wetlands in the Tualatin Valley, Oregon Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/bz60cx18t

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  • Recent statistics have indicated a significant loss of wetland area to agricultural conversion has occurred in the second half of this century in the continental United States. Wetlands in the Tualatin Valley were examined for consistency with this trend. Acreage of non-linear palustrine wetlands in five classes were calculated for the years 1975 and 1988. The resulting data showed an overall decline in area of 10%. Over 85% of the decline was of the emergent class, for which an almost 20% decrease occurred since 1975. Sixty individual natural wetland areas disappeared. Seventy-five percent of this reduction can be attributed to agricultural conversion or alteration. Between 21 and 35% of the 1975 wetland area, mainly emergent wetlands, was found to be in some type of agricultural use in 1988. An estimated 67% of the 1988 wetland acreage was judged to have agricultural land uses adjacent to it, suggesting a potential for future alterations or conversions to agricultural use under the right conditions.
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