Index Catalog // Hyrax

Distinguishing biological and physical controls on soil respiration

O Criador:: Phillips, Claire L.
Abstract:: Soil respiration, or the combined CO₂ emissions from roots and soil microorganisms, constitutes one of the largest losses of carbon (C) from terrestrial ecosystems. The major drivers of soil respiration, which include soil moisture, temperature, and substrate quality, have been known for some time. Nevertheless, correlations between these drivers and...
Resource Type:: Dissertation

Environmental variability and system heterogeneity in terrestrial biogeochemical models

O Criador:: Sierra, Carlos Alberto
Abstract:: Ecosystems are highly heterogeneous systems subjected to important levels of environmental variability; however, it is common in terrestrial biogeochemical models to assume homogeneous properties of the elements of the system or constant environmental conditions. For some processes, heterogeneity in these models is treated very simplistically, but there is not much...
Resource Type:: Dissertation

Effects of canopy gaps in Douglas-fir forests and resource gradients on fecundity and growth of understory herbs

O Criador:: St. Pierre, Elizabeth A. (Elizabeth Ann)
Abstract:: Effects of small-scale disturbances on fecundity and growth rates of Linnaea borealis L., Tiarella trifoliata L. var. unifoliata, and Trillium ovatum Pursh. were studied in old-growth forests in the Tsuga heterophylla Zone on the west slope of the Cascade Mountain Range of Oregon. Performance of each species was compared in...
Resource Type:: Dissertation

Patterns of nitrogen fluxes in watersheds of the H.J. Andrews Experimental Forest, OR

O Criador:: Vanderbilt, Kristin Lynn, 1967-
Abstract:: Seasonal and annual patterns of N fluxes and concentrations in streamwater in six conifer-dominated watersheds at the H.J. Andrews Experimental Forest, OR, were studied to gain insight into the factors that influence N retention in this ecosystem. Processes affecting N flux in streamwater differed between organic (DON) and inorganic (DIN;...
Resource Type:: Dissertation

Influence of root architectural development on Douglas-fir seedling morphology and physiology

O Criador:: Jacobs, Douglass Frederick
Abstract:: A series of experiments were established to gain a better understanding of the extent to which Douglas-fir seeding root architecture may be manipulated and subsequent influences on seedling morphological and physiological development. The incorporation of amendments into nursery soils changed root architecture to some degree, but did not produce large...
Resource Type:: Dissertation

Spatial modeling of carnivore distribution and viability

O Criador:: Carroll, Carlos
Abstract:: Viability analysis of well-selected focal species can complement other types of conservation planning by revealing thresholds in habitat area and landscape connectivity that may not be evident from ecosystem-level evaluations. I used focal species analysis of five carnivores to suggest conservation planning guidelines for the Rocky Mountains and adjacent areas...
Resource Type:: Dissertation

Maritime windstorm influence on soil process in a temperate rainforest

O Criador:: Kramer, Marc G.
Abstract:: Maritime cyclonic windstorms cause widespread disturbance to forested ecosystems in southeast Alaska. The consequence of this disturbance process on the movement, storage, and quality of soil carbon, forest hydrology and streamwater chemistry was studied along a windthrow disturbance sequence. Soil profiles were described and the thickness of the major organic...
Resource Type:: Dissertation

Potential carbon storage at the landscape scale in the Pacific Northwest, U.S.A.

O Criador:: Smithwick, Erica Ann Hoffa
Abstract:: Estimates of potential carbon (C) storage can be used to constrain predictions of future carbon sequestration and to understand the degree to which disturbances, both natural aid anthropogenic, affect C storage. An upper bound on C storage in the Pacific Northwest (PNW) of the United States was estimated using field...
Resource Type:: Dissertation

Physiological impacts of Swiss needle cast on Douglas-fir

O Criador:: Manter, Daniel K.
Abstract:: A series of studies, in three western Oregon Douglas-fir plantations, was conducted to understand the physiological impacts of Swiss needle cast on Douglas-fir physiology. Four aspects of the disease complex were investigated: fungal colonization and assessment, plant-water relations, carbon assimilation and interaction with climate. Several techniques were developed and used...
Resource Type:: Dissertation

Measuring and modeling gene flow from hybrid poplar plantations : implications for transgenic risk assessment

O Criador:: DiFazio, Stephen P.
Abstract:: Hybrid poplar plantations (Populus trichocarpa x Populus deltoides) are a relatively new feature on the landscape in the Pacific Northwest of the United States, and these plantations may soon include genetically engineered trees. Meanwhile, many wild poplar populations (Populus spp.) are highly degraded due in part to logging, dams, grazing,...
Resource Type:: Dissertation

Hyrax

Distinguishing biological and physical controls on soil respiration

Environmental variability and system heterogeneity in terrestrial biogeochemical models

Effects of canopy gaps in Douglas-fir forests and resource gradients on fecundity and growth of understory herbs

Patterns of nitrogen fluxes in watersheds of the H.J. Andrews Experimental Forest, OR

Influence of root architectural development on Douglas-fir seedling morphology and physiology

Spatial modeling of carnivore distribution and viability

Maritime windstorm influence on soil process in a temperate rainforest

Potential carbon storage at the landscape scale in the Pacific Northwest, U.S.A.

Physiological impacts of Swiss needle cast on Douglas-fir

Measuring and modeling gene flow from hybrid poplar plantations : implications for transgenic risk assessment

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