Vegetation ecology and net primary productivity of selected freshwater wetlands in Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2n49t4549

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  • Vegetation ecology of eight Oregon freshwater wetlands was described and net aerial primary productivity estimated in four wetlands. Plant cover samples were used to classify 37 wetland and 11 terrestrial communities by agglomerative hierarchical clustering. Samples and species were ordinated. Direct measurements were made of sample relative elevation, inundation duration, and soil saturation. Within- (alpha) and between- (beta) diversities were determined for communities. Alpha diversity was correlated with wetland elevation/ inundation-soil saturation gradient. Three coastal zone wetlands were studied: Daley Lake, Bayocean, and Rockaway within which 12 wetland and four terrestrial communities were identified. Alpha diversity for Daley Lake and Bayocean emergent wetlands increased with increasing elevation and decreasing inundation period (mean r² = 0.51 and 0.53 respectively). High beta diversities within these wetlands suggests community distinctiveness. Mean productivity at Daley Lake was 2872 g/m²/yr. Three Willamette Valley wetlands were studied: Frazier- Jackson, Gray Creek, and Fern Ridge within which 14 wetland and three terrestrial communities were identified. Alpha diversity increased with decreasing inundation (mean r² = 0.54). High beta diversity reflected community homogenity. Mean productivity for the Fern Ridge wetland was 1837 g/m ² /yr. Seven wetland communities, including two wetland community types (tall perennial and prostrate perennial), and two terrestrial assemblages were identified within the Cascade Mountains' Davis Lake site. For the total wetland system, alpha diversity increased along the elevation/inundation gradient (mean r ² = 0.52). Beta diversity of prominent communities suggests vegetative homogenity. Mean productivity for the tall perennial wetland type was 1325 g/m²/yr and for the prostrate perennial type 207 g/m ² /yr. The Lookout Creek wetland site in the Ochoco Mountains included four wetland and two terrestrial communities. Greatest overall alpha diversity was in the moderately saturated areas. The Lookout Creek wetland communities were vegetatively distinct. Mean productivity for the Lookout Creek wetland was 889 g/m²/yr. Floristic similarities among all 37 wetland communities were analyzed. Generally, communities within the same wetland were floristically more similar to each other than to communities of other wetlands. Emergent plant communities west of the Cascade Mountains tended to be more floristically similar to one another than to those of central Oregon. Forested wetland plant communities were floristically dissimilar to emergent wetland communities.
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