Index Catalog // ScholarsArchive@OSU

Non-linear nitrogen dynamics and calcium depletion along a temperate forest soil nitrogen gradient

Creator:: Sinkhorn, Emily R.
Abstract:: Understanding how N availability influences base cation stores is critical for long-term ecosystem sustainability. Indices of nitrogen (N) availability and the distribution of nutrients in plant biomass, soil, and soil water were examined across ten young, unpolluted Douglas-fir (Pseudotsuga menziesii) stands in the Oregon Coast Range spanning a three-fold soil...
Resource Type:: Masters Thesis
Full Text:: Douglas-fir (Pseudotsuga menziesii) stands in the Oregon Coast Range spanning a three-fold soil N

Cover crop nitrogen for summer vegetable crops

Creator:: Burket, John Zimmerman, 1953-, Sandeno, J., Hemphill, D., Dick, R., and Oregon State University. Extension Service
Abstract:: Nitrogen (N) is an important nutrient for crop growth. Winter cover crops planted after a commercial crop is harvested, or relay planted before harvest, can provide N for subsequent crops, thus saving money and improving soil quality. Furthermore, cover crops can recover N remaining in the soil following summer crops,...
Resource Type:: Technical Report
Full Text:: (Oregon State University Extension Service) 1 Cover Crop Nitrogen for Summer Vegetable Crops EM 8803

Decomposition and nitrogen dynamics of red alder and Douglas-fir leaf litter in Oregon Coast Range riparian forests

Creator:: Matkins, Joselin
Abstract:: I examined factors regulating decomposition rates of red alder (Alnus rubra)) and Douglas-fir (Pseudotsuga menziesii) leaf litter in Coast Range riparian areas in western Oregon. Overall, this study was designed to examine the influence that leaf litter quality characteristics and decomposition site treatment have on decomposition rates, to provide a...
Resource Type:: Masters Thesis
Full Text:: seasonality in litterfall dynamics in Coast Range riparian forests (Hart 2006). Nitrogen fixation by red

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Creator:: Holub, Scott M.
Abstract:: Forests in the Pacific Northwest receive very little nitrogen through atmospheric deposition and thus studying the nitrogen cycle in this region can provide insights into how the unpolluted nitrogen cycle functions. I examined the fate of organic nitrogen versus inorganic nitrogen and the effect of tamlins on N retention by...
Resource Type:: Dissertation
Full Text:: Organic and Inorganic Nitrogen Inputs in an Old-growth Forest of the Central Oregon Cascade Range

Groundwater and nitrogen management in Willamette Valley mint production

Creator:: Oregon State University. Extension Service, Selker, John, and Rupp, David Earl
Abstract:: Directly below commercial mint fields, percolation in excess of 10 ppm of nitrogen as nitrate (NO3 --N), the EPA drinking water standard, occurs for much of the year (Figure 1, page 2). Concentrations rise rapidly after irrigation starts in June, indicating that this nitrogen is being pushed through by irrigation...
Resource Type:: Technical Report
Full Text:: assistant, Department of Bioengineering; Oregon State University. EM 8861 • April 2004 $1.00 Is Nitrogen

Establishment and growth of natural and planted conifers ten years after overstory thinning and vegetation control in 50-year-old Douglas-fir stands

Creator:: Nabel, Mark R.
Abstract:: Forest managers of public lands in western Oregon and Washington have become increasingly interested in creating additional conifer cohorts in young, even-aged, second-growth Douglas-fir stands. The purpose of our research was to assess the establishment, survival, and growth of naturally-regenerated and underplanted conifers 10-13 years after overstory thinning and understory...
Resource Type:: Masters Thesis
Full Text:: the Oregon Coast Range were used in our study. One site was relatively dry (~130 cm of annual

The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

Creator:: Boyle, Stephanie A.
Abstract:: The objectives of this thesis were to examine the links between soil microbial community composition and function using the nitrogen (N) cycle as a model for these interactions and to assess the impact of environmental factors such as microclimate, vegetation type, and nutrient availability on microbial diversity and N transformations...
Resource Type:: Dissertation
Full Text:: -productivity site located in the Coast Range and the second a lower-productivity site located in the Cascade

Factors limiting the distribution of the sensitive lichen Usnea longissima in the Oregon Coast Range : habitat or dispersal?

Creator:: Keon, Dylan B.
Abstract:: The sensitive lichen Usnea longissima Ach., formerly a fairly common circumboreal species, has been extirpated from much of its range (e.g., Eastern Europe). Although the U.S. Pacific Northwest (PNW) remains a relative stronghold for the species, U longissima faces increasing pressure in the region from habitat loss, air pollution, and...
Resource Type:: Masters Thesis
Full Text:: Usnea longissima in the Oregon Coast Range : habitat or dispersal? AN ABSTRACT OF THE THESIS OF

The association of epiphytic macrolichens and bryophytes with riparian stand types along a valley continuum, Oregon Coast Range

Creator:: Ruchty, Andrea M.
Abstract:: I surveyed epiphytic macrolichens and bryophytes in six stands in each of seven riparian stand types in the Oregon Coast Range. This study (Chapter 2) describes the association of epiphytes with stand types and the corresponding potential of forest canopy conversions to affect epiphyte communities. Species composition, diversity, and representation...
Resource Type:: Masters Thesis
Full Text:: riparian stand types along a valley continuum, Oregon Coast Range AN ABSTRACT OF THE THESIS OF Andrea M

Plant and amphibian assemblages in zero-order basins in the Oregon Coast Range

Creator:: Sheridan, Chris D.
Abstract:: We have a poor understanding of the biotic communities in zero-order basins, drainages extending from ridgelines to the initiation of first-order streams. This study describes baseline plant and amphibian composition in unmanaged zero-order basins in the Oregon Coast Range. Specifically, I studied: i) the spatial distribution and diversity of species,...
Resource Type:: Masters Thesis
Full Text:: Assemglages in Zero-Order Basins in the Oregon Coast Range. ) Signature redacted for privacy. Abstract

ScholarsArchive@OSU

Non-linear nitrogen dynamics and calcium depletion along a temperate forest soil nitrogen gradient

Cover crop nitrogen for summer vegetable crops

Decomposition and nitrogen dynamics of red alder and Douglas-fir leaf litter in Oregon Coast Range riparian forests

The fate of organic and inorganic nitrogen inputs in an old-growth forest of the central Oregon Cascade Range

Groundwater and nitrogen management in Willamette Valley mint production

Establishment and growth of natural and planted conifers ten years after overstory thinning and vegetation control in 50-year-old Douglas-fir stands

The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

Factors limiting the distribution of the sensitive lichen Usnea longissima in the Oregon Coast Range : habitat or dispersal?

The association of epiphytic macrolichens and bryophytes with riparian stand types along a valley continuum, Oregon Coast Range

Plant and amphibian assemblages in zero-order basins in the Oregon Coast Range

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