Edaphic Controls Over Succession In Former Oak Savanna, Willamette Valley, Oregon

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Title: Edaphic Controls Over Succession In Former Oak Savanna, Willamette Valley, Oregon
Author: Murphy, Meghan Suzanne, 1979-
Abstract: Oak savanna was a dominant ecosystem of Oregon's Willamette Valley prior to Euro-American settlement but has declined precipitously due to urbanization, agriculture, and reduced fire regimes. Some areas have retained their savanna structure while others have succeeded into woodland or forest. I investigated the relationships of current community type to edaphic (bulk density, texture, carbon, nitrogen, depth, and pH) and topographic (slope and heatload) factors at seven sites using analysis of variance and principal components analysis. Results indicate that edaphic and topographic conditions strongly influence successional pathways in former oak savanna, but the specific effects depend on site location. Soil moisture was also measured seasonally at three of the sites in community types representing the current successional stages. Results indicate that dry conditions restrict succession to dense forest, and that soil depth is an important control over soil moisture within the soil profile.
Description: xii, 87 p. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.
URI: http://hdl.handle.net/1794/7887
Date: 2008-06


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