Index Catalog // ScholarsArchive@OSU

The development and decline dynamics of two ectomycorrhizal fungal mat soil microbial communities in response to a reciprocal soil transfer experiment in old-growth Douglas-fir forests

Creator:: Cappellazzi, Jed E.
Abstract:: Ectomycorrhizal fungi (EmF) form symbioses with trees. These symbioses profoundly influence forest ecology. Certain EmF form specialized profusions of hyphae, known as ectomycorrhizal fungal mats (mats) which are visible to the naked eye, alter forest soil biogeochemistry, substantially contribute to soil microbial biomass/respiration and support unique microbial communities. Piloderma and...
Resource Type:: Masters Thesis
Full Text:: onto land ~480 mya (Pirozynski & Malloch, 1975; Wang & Qiu, 2006; Cappellazzi et al., 2007

Soil physical properties and available water capacity of southwest Oregon forest soils

Creator:: Flint, Alan L.
Abstract:: Measurements for water retention calculations and physical characterization were made on skeletal and non-skeletal soils in southwest Oregon. A new bulk density sampler was designed for the physical characterization of the steep, skeletal soils commonly encountered in this area. The new sampler and the techniques required for the measurement and...
Resource Type:: Masters Thesis
Full Text:: Program (PNW-80-85), a cooperative project of Oregon State University, the USDA Forest Service,and the

Development of predictive mapping techniques for soil survey and salinity mapping

Creator:: Elnaggar, Abdelhamid A.
Abstract:: Conventional soil maps represent a valuable source of information about soil characteristics, however they are subjective, very expensive, and time-consuming to prepare. Also, they do not include explicit information about the conceptual mental model used in developing them nor information about their accuracy, in addition to the error associated with...
Resource Type:: Dissertation

Winter wheat response to nitrogen, phosphorus, sulfur, and zinc supplied by municipal biosolids

Creator:: Shearin, Todd E.
Resource Type:: Masters Thesis
Full Text:: . Worksheet for calculating biosolids application rates in agriculture. PNW Publication 511. Washington State

Long-term effects of tillage, nitrogen, and rainfall on winter wheat yields

Creator:: Camara, Kelli Marie
Abstract:: Winter wheat is commonly grown in dryland cropping systems in the Pacific Northwest region of semi-arid eastern Oregon. For agronomic, economic, and environmental reasons, it is important to understand the long-term sustainability of such dryland systems. The objective of this study was to evaluate the long-term effects of tillage, nitrogen...
Resource Type:: Masters Thesis
Full Text:: , tillage and cropping practices designed to conserve soil and water in the Pacific Northwest (PNW) have

Effects of soil surface shading, mulching and vegetation control on Douglas-fir seedling growth and microsite water partitioning

Creator:: Flint, Lorraine E.
Abstract:: A two year study with 500 seedlings was conducted in the harsh, drought prone southwest Oregon environment to assess the effects of 12 soil surface shading, mulching and vegetation control techniques on soil temperature and moisture environments and seedling growth. Treatments modified, to various degrees, soil surface temperatures, reduced soil...
Resource Type:: Masters Thesis
Full Text:: -skeletal, mixed, mesic Typic Xerochrept. Average soil depth is 660 mm ranging between 480-685 mm. Total

Carbon cycling and priming of soil organic matter decomposition in a forest soil following glucose additions

Creator:: Diaz, David D.
Abstract:: Soils are a globally significant carbon (C) pool and have the potential to respond to elevated CO2 and environmental changes through positive feedback cycles that enhance the turnover of soil organic matter (SOM). Understanding the mechanisms governing the turnover of SOM is particularly important for modeling the fate of C...
Resource Type:: Masters Thesis

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon

Creator:: Myhrum, Ronald P.
Abstract:: This study was undertaken to determine both the amount and the spatial variability of sand, silt, clay, and six fractions of coarse fragments in soils representing harsh sites for reforestation. Particle size data were collected because of their direct relationship to water holding capacity and the plantability and survivability of...
Resource Type:: Masters Thesis

Cation exchange properties of forest litter as influenced by vegetation type and decomposition

Creator:: Warner, Susan Ann
Abstract:: Decomposition of forest litter is a complex process involving interactions between physical, chemical and biological factors. As litter decomposes it is chemically altered. Cation exchange capacities of litter represent a means of characterizing the number of hydrophilic acid groups. Some kind of soil-root ion exchange mechanisms are utilized by the...
Resource Type:: Masters Thesis

Estimating the dry matter production, nitrogen requirements, and yield of organic farm-grown potatoes

Creator:: McQueen, John Paul Gainer
Abstract:: As part of a participatory research project, where farmers and Oregon State University researchers collaborated, aspects of potato (Solanum tuberosum L.) growing systems were studied. It was determined through conversations with the farmers that quantification of certain growth parameters of potato was lacking, including dry matter accumulation, crop nitrogen (N)...
Resource Type:: Masters Thesis
Full Text:: soil to organic agriculture is not available. Extension bulletin PNW 513 Nitrogen Uptake and

ScholarsArchive@OSU

The development and decline dynamics of two ectomycorrhizal fungal mat soil microbial communities in response to a reciprocal soil transfer experiment in old-growth Douglas-fir forests

Soil physical properties and available water capacity of southwest Oregon forest soils

Development of predictive mapping techniques for soil survey and salinity mapping

Winter wheat response to nitrogen, phosphorus, sulfur, and zinc supplied by municipal biosolids

Long-term effects of tillage, nitrogen, and rainfall on winter wheat yields

Effects of soil surface shading, mulching and vegetation control on Douglas-fir seedling growth and microsite water partitioning

Carbon cycling and priming of soil organic matter decomposition in a forest soil following glucose additions

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon

Cation exchange properties of forest litter as influenced by vegetation type and decomposition

Estimating the dry matter production, nitrogen requirements, and yield of organic farm-grown potatoes

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