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Comparing Vegetation and Soils of Remnant and Restored Wetland Prairies in the Northern Willamette Valley

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https://ir.library.oregonstate.edu/concern/articles/wh246t893

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Abstract
  • Most of the native wetland prairies once found in the Willamette Valley of Oregon, USA have been converted to agriculture, developed, or altered by disturbance and cessation of burning, especially in the northern portion of the valley. Mitigation efforts by Portland Metro and the NRCS have resulted in restoration of several wetland prairies, and the need for research to help assess restoration success. Here, data on vegetation and soils from three remnant wetland prairies and three restored wetland prairies in the northern Willamette Valley were analyzed to investigate whether differences among sites are related to site characteristics or management. Vascular plant species presence and percent cover data were collected from three 10 m x 10 m plots randomly located within study sites. Soil samples were collected adjacent to these plots and from nearby agricultural sites and analyzed for organic matter, moisture content, pH, and soil texture. Multivariate ordination techniques and ANOVA were used to assess differences among sites. Native species cover was higher in restorations than remnants, although remnant and restored sites did not differ in native species richness. However, NMS ordination distinguished restorations from remnants. Species such as Deschampsia cespitosa, Carex densa, Juncus tenuis and Holcus lanatus were associated with remnants, whereas Anthemis cotula, Agrostis exarata, Plagiobothrys scouleri and Veronica perigrina were associated with restorations. Soil moisture and organic matter are positively correlated with remnant status, while management attributes such as herbicide use, mowing, and cultivation of “clean crops” prior to restoration are correlated with vegetation assemblages of restorations. While some restoration goals are being met within a decade of restoration, plant communities in restorations differ from those of wetland prairie remnants.
  • Keywords: Wetland restoration, Ecosystem services, Deschampsia cespitosa
  • Keywords: Wetland restoration, Ecosystem services, Deschampsia cespitosa
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  • Taylor, S. M., & Santelmann, M. V. (2014). Comparing Vegetation and Soils of Remnant and Restored Wetland Prairies in the Northern Willamette Valley. Northwest Science, 88(4), 329-343. doi:10.3955/046.088.0407
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  • 88
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  • 4
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  • We thank the United State Geological Survey and the Oregon State University Institute for Water and Watersheds for research support.
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file details SantelmannMaryCEOASComparingVegetationSoilsRemnantRestoredWetlandPrairies.pdf 2017-07-25 Público Descargar