Browsing Electronic Dissertations and Theses, Environment by Title
Now showing items 25-44 of 70
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HYDROLOGIC CONTROLS ON NITROGEN CYCLING AND NITRATE TRANSPORT THROUGH THE VADOSE ZONE OF A SUBSURFACE ARTIFICIALLY-DRAINED DRYLAND AGROECOSYSTEM IN THE PALOUSE BASIN OF EASTERN WASHINGTON
(2015)Advances in the application of stable isotopes to address environmental issues have led to new understandings of biogeochemical cycles for both natural and agricultural systems. Of particular concern, is understanding ... -
HYDROLOGIC DYNAMICS CONTROL DISSOLVED ORGANIC MATTER EXPORT FROM WATERSHEDS: FIELD-SCALE PROCESSES IN A SMALL, ARTIFICIALLY DRAINED AGRICULTURAL CATCHMENT, AND PATTERNS ACROSS ECOSYSTEMS
(2014)Dissolved organic matter (DOM) is an important component of nutrient cycling and energy transfer within and between ecosystems. Understanding controls over the magnitude and quality of DOM that is transferred from soils ... -
Influences of the environment and plankton community interactions on toxic cyanobacterial blooms in Vancouver Lake, Washington, a temperate shallow freshwater system
(2015)Occurrences of cyanobacterial blooms are in freshwater systems are increasing in frequency and intensity largely in response to urbanization of landscapes, eutrophication, and climate change. Cyanobacterial blooms negatively ... -
INTERACTIONS BETWEEN NONNATIVE AMERICAN SHAD (ALOSA SAPIDISSIMA) AND FALL CHINOOK SALMON (ONCORHYNCHUS TSHAWYTSCHA) IN LOWER COLUMBIA RIVER FOOD WEBS
(2017)Lower Columbia River Food Webs have undergone many changes resulting from impoundment, introduction of nonnatives, and supplementation with hatchery salmon (Oncorhynchus spp.). American Shad (Alosa sapidissima) are an ... -
Low-δ RHYOLITES OF SOUTHWESTERN IDAHO AND VICINITY
(2010)This dissertation is divided into three chapters, each to be submitted to peer-reviewed journals, addressing the volcanology, petrology, and petrogenesis of rhyolitic volcanics in southwestern Idaho. Chapter 1: Conflicting ... -
MANAGEMENT IMPLICATIONS FOR A LACUSTRINE BROOK TROUT POPULATION: AN INVESTIGATION IN AGE PRECISION AND POPULATION DYNAMICS
(2019)Areas in the Columbia River Basin have been impacted by hydroelectric dam developments, requiring some anadromous and resident fish losses to be mitigated with resident fisheries enhancement. Brook Trout are one resident ... -
Mapping soil-landscape elements and the wetland in dambos and estimating CH4 and CO2 emissions from a dambo-terminated catena
(2014)Dambos are seasonally saturated grassy valleys mainly found on the central African plateau. They are usually sub-divided into three catenary units - gleyed and frequently inundated bottoms, flat and rarely inundated floors, ... -
Mapping, geologic evolution and petrogenesis of the McDermitt caldera center, northern Nevada & southern Oregon, USA
(2014)The McDermitt caldera center ("McDermitt") is a polygenetic mid-Miocene volcanic center along the border of northern Nevada and southern Oregon, USA, and is one of the first silicic centers associated with the Yellowstone ... -
Mesotrophic Lake Biotic Responses to Hypolimnetic Oxygenation
(2016)The distribution, abundance, and diversity of lake biota can be impacted by the duration and extent of low dissolved oxygen levels. To increase dissolved oxygen levels and improve the trout fishery, the hypolimnion of North ... -
MOLECULAR AND MICROSCOPIC INSIGHTS INTO THE RHIZOSPHERIC PROCESSES
(2017)Rhizosphere, the zone immediately adjacent to plant roots, represents a hotspot of carbon exudation, turnover, respiration, transformation and accumulation. The importance of roots for the formation of soil organic matter ... -
Nitrogen nutrition of hybrid poplars
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Oil and The Libyan Economy
(2015)Oil is the single most important resource in the Libyan economy. In order to explore the extent to which oil dominates the development of Libyan national income, this study covers the period time from 1990 to 2009. This ... -
ORIGIN AND EVOLUTION OF A LARGE SILICIC CALDERA COMPLEX: VALLES CALDERA AND THE ASSOCIATED UPPER BANDELIER TUFF
(2013)The Jemez Mountains Volcanic Field, New Mexico, has been active for more than 20 Ma and it is a very complex system that has attracted much scientific attention for many decades, but some areas are remain poorly understood. ... -
Population Genetics of Phalaris arundinacea L. In A Western United States Wetland
(2015)Turnbull National Wildlife Refuge (henceforth Refuge) is located in east central Washington State. This area, within the Channeled Scablands, was created by numerous and enormous floods over 15,000 years ago. The refuge ... -
POST-CALDERA VOLCANISM IN YELLOWSTONE NATIONAL PARK: PETROGENESIS OF THE INTRACALDERA UPPER BASIN MEMBER OF THE PLATEAU RHYOLITE AND EXTRA-CALDERA MINGLED MAGMA COMPLEXES
(2011)The Plateau Rhyolite erupted following the last large Yellowstone caldera collapse and may have erupted from a rejuvenating magmatic system. Our preferred model for rhyolite genesis is by assimilation of continental crust ...