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Articles 871 - 900 of 4004
Full-Text Articles in Forest Management
Conifer Encroachment And Removal In A Northern California Oak Woodland: Influences On Ecosystem Physiology And Biodiversity, Gabriel S. Goff
Conifer Encroachment And Removal In A Northern California Oak Woodland: Influences On Ecosystem Physiology And Biodiversity, Gabriel S. Goff
Cal Poly Humboldt theses and projects
Oregon white oak (Quercus garryana) woodlands across their range are becoming increasingly threatened by encroaching Douglas-fir encroachment (Pseudotsuga menziesii) as a result of fire exclusion. Using water potential (Ψ), stomatal conductance (gs), xylem water stable isotopes (dD), and three metrics of biodiversity, this study investigates the effects of conifer encroachment and removal at the ecosystem-scale. The study was set in an Oregon white oak woodland in northern California and compared three levels of encroachment before and after conifer removal. Findings indicate that heavily encroached stands have the least amount of water stress and gas …
Comparison Of Low-Cost Commercial Unpiloted Digital Aerial Photogrammetry To Airborne Laser Scanning Across Multiple Forest Types In California, James Edward Lamping
Comparison Of Low-Cost Commercial Unpiloted Digital Aerial Photogrammetry To Airborne Laser Scanning Across Multiple Forest Types In California, James Edward Lamping
Cal Poly Humboldt theses and projects
Science-based forest management requires quantitative information about forest attributes traditionally collected via sampled field plots in a forest inventory program. Remote sensing tools, such as active three-dimensional (3D) Light Detection and Ranging (lidar), are increasingly utilized to supplement and even replace field-based forest inventories. However, lidar remains cost prohibitive for smaller areas and repeat measurement, often limiting its use to single acquisitions of large contiguous areas. Recent advancements in unpiloted aerial systems (UAS), digital aerial photogrammetry (DAP) and high precision global positioning systems (HPGPS) have the potential to provide low-cost time and place flexible 3D data to support forest inventory …
The Politics Of Biomass Energy In California: How External Benefits Are Used To Support An Economically Marginal Sector, Dana L. Dysthe
The Politics Of Biomass Energy In California: How External Benefits Are Used To Support An Economically Marginal Sector, Dana L. Dysthe
Cal Poly Humboldt theses and projects
Since the 1990s, there has been a decline in biomass energy generation in California. In order to promote state governmental policies aiming to increase biomass energy generation in California, the sector has been linked to a series of external benefits that biomass energy purportedly brings. Through document analysis, semi-structured interviews, and participant observation, five distinct external benefits were identified that have been used to promote the biomass energy sector. These external benefits are: renewable energy generation, air quality improvements, promotion of forest restoration and fuel removal projects, disposal of wood waste from agricultural and forestry sectors, and rural economic development. …
Effects Of Prescribed Fire On Drought Resistance And Recovery In Mixed Conifer Forests Of Lassen Volcanic National Park, California, Zachary J. Wenderott
Effects Of Prescribed Fire On Drought Resistance And Recovery In Mixed Conifer Forests Of Lassen Volcanic National Park, California, Zachary J. Wenderott
Cal Poly Humboldt theses and projects
Forests throughout much of the western United States are experiencing increasing climatic variability, often resulting in decreased forest productivity and elevated likelihood of tree mortality. Severe drought, such California’s recent 2012-2015 drought, are projected to increase in intensity, frequency, and severity throughout much of this region in coming years. Forest management has long relied on prescribed fire and mechanical thinning to reduce fuel loads and ameliorate potential fire hazards. These treatments may also have the ability to reduce stand density, alleviate competitive pressures, and allow residual trees access to critical resources during periods of extreme stress. Utilizing a long-term National …
Use Of Redwood Basal Hollows By Bats: A Focus On The Townsend's Big-Eared Bat On The North Coast Of California, Amon Jotesh Armstrong
Use Of Redwood Basal Hollows By Bats: A Focus On The Townsend's Big-Eared Bat On The North Coast Of California, Amon Jotesh Armstrong
Cal Poly Humboldt theses and projects
Loss of roosting resources, either through disturbance or removal, negatively affects bats. For sensitive species, such as the Townsend’s big-eared bat (Corynorhinus townsendii), determining roost requirements is a critical component in conserving their habitat. Such cavity roosting bats on the North Coast of California may use hollows in large redwood trees. In this study, I examined the factors determining the use of basal tree hollows by different bat species at eight redwood forest sites in Del Norte, Humboldt, and Mendocino Counties, California. Bat guano was collected from 179 basal hollow roosts from 2017 to 2018, and guano mass …
Collaborative Conservation And Backcountry Weed Control: A Case Study Of The Great Burn Proposed Wilderness, Christopher James Prange
Collaborative Conservation And Backcountry Weed Control: A Case Study Of The Great Burn Proposed Wilderness, Christopher James Prange
Graduate Student Theses, Dissertations, & Professional Papers
Noxious weeds have become a management priority on public lands in the United States. Managing invasive weed populations in natural areas with complex ecosystems presents issues that need a systems-wide approach over long temporal and spatial scales. This broad-scale problem increasingly demands collaborative efforts. While collaborative conservation has become a tool in natural resource management during the 21st century, it is less commonly applied in weed control in backcountry wilderness areas. Programs that have been initiated are understudied. Accordingly, this research was conducted through semi-structured interviews to gather perspectives of weed professionals involved in a collaborative backcountry weed program …
Climatic Drivers Of Growth In Mixed Conifer Forests Of The Sierra Nevada For Different Tree Sizes And Thinning Treatments, Andrew M. Hirsch
Climatic Drivers Of Growth In Mixed Conifer Forests Of The Sierra Nevada For Different Tree Sizes And Thinning Treatments, Andrew M. Hirsch
Graduate Theses, Dissertations, and Problem Reports (ETD)
The Mediterranean region of northern California is projected to get increasingly warmer under all Intergovernmental Panel on Climate Change (IPCC) emission scenarios, with future precipitation projections not showing much of a trend. This poses a problem to the already dry summers that are experienced in the Mediterranean region of California. If precipitation does not increase alongside temperatures, the dry seasons will likely only get drier. The use of dendroclimatology to assess how mixed conifer species in the Sierra Nevada responded to past climate is a key resource that can be used to infer how trees may respond to a future …
Determining The Effects Of Imidacloprid On Non-Target Soil Organisms In Hemlock Stands, Braley Burke
Determining The Effects Of Imidacloprid On Non-Target Soil Organisms In Hemlock Stands, Braley Burke
Graduate Theses, Dissertations, and Problem Reports (ETD)
The hemlock woolly adelgid (HWA), Adelges tsugae Annand (Hemiptera: Adelgidae), is an invasive insect that is causing mortality of eastern hemlock trees, Tsuga canadensis, and Carolina hemlock trees, Tsuga caroliniana, across the eastern United States. To protect these ecologically important tree species, a neonicotinoid insecticide, imidacloprid, is commonly used. Imidacloprid is an effective treatment and can remain effective against HWA for four to six years but long-term (≥ one year after application) non-target effects of imidacloprid on forest ecosystems are not well-studied. This study examined terrestrial non-target effects of imidacloprid in hemlock stands with different treatment histories to …
Environmental Controls On The Terrestrial Water Cycle In Forested Mountain Ecosystems., Luis Andrés Guillén
Environmental Controls On The Terrestrial Water Cycle In Forested Mountain Ecosystems., Luis Andrés Guillén
Graduate Theses, Dissertations, and Problem Reports (ETD)
Water is a key resource to natural ecosystems and human societies alike, and the water cycle is fundamentally linked to the climate and the characteristics of catchments. However, the challenges posed by environmental change makes it imperative to understand how the water cycle is affected by biotic and abiotic factors, in particular, in areas that are crucial sources of water like forested headwater catchments. Therefore, this doctoral dissertation aims to advance the knowledge on the dynamics between climate, vegetation and landscape that determine the water balance of forested mountain ecosystems. This document presents five chapters, an introductory chapter, three standalone …
Satellite-Based Phenology Analysis In Evaluating The Response Of Puerto Rico And The United States Virgin Islands' Tropical Forests To The 2017 Hurricanes, Melissa Collin
Cal Poly Humboldt theses and projects
The functionality of tropical forest ecosystems and their productivity is highly related to the timing of phenological events. Understanding forest responses to major climate events is crucial for predicting the potential impacts of climate change. This research utilized Landsat satellite data and ground-based Forest Inventory and Analysis (FIA) plot data to investigate the dynamics of Puerto Rico and the U.S. Virgin Islands’ (PRVI) tropical forests after two major hurricanes in 2017. Analyzing these two datasets allowed for validation of the remote sensing methodology with field data and for the investigation of whether this is an appropriate approach for estimating forest …
Smokejumper Obituary: Cummings#1, Harry Lee (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Cummings#1, Harry Lee (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Strange, Jon S. (Mccall 1963), National Smokejumper Association
Smokejumper Obituary: Strange, Jon S. (Mccall 1963), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Welborn, Robert W. (La Grande 1976), National Smokejumper Association
Smokejumper Obituary: Welborn, Robert W. (La Grande 1976), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Hill, James M. (Missoula 1971), National Smokejumper Association
Smokejumper Obituary: Hill, James M. (Missoula 1971), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Wright, Joe E. "Grey Eagle" (Grangeville 1958), National Smokejumper Association
Smokejumper Obituary: Wright, Joe E. "Grey Eagle" (Grangeville 1958), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Allen, James Charles (North Cascades 1946), National Smokejumper Association
Smokejumper Obituary: Allen, James Charles (North Cascades 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Hinkle, Gene E. (Missoula 1947), National Smokejumper Association
Smokejumper Obituary: Hinkle, Gene E. (Missoula 1947), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Adams, Marshall Carruth (Missoula 1948), National Smokejumper Association
Smokejumper Obituary: Adams, Marshall Carruth (Missoula 1948), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Tyler, Grover Sumpter "Doc" (Missoula 1947), National Smokejumper Association
Smokejumper Obituary: Tyler, Grover Sumpter "Doc" (Missoula 1947), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Baker, Alvin Fleming (Cave Junction 1960), National Smokejumper Association
Smokejumper Obituary: Baker, Alvin Fleming (Cave Junction 1960), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Nolan, Robert Lloyd "Bob" (Cave Junction 1947), National Smokejumper Association
Smokejumper Obituary: Nolan, Robert Lloyd "Bob" (Cave Junction 1947), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: O'Rourke Jr., Daniel James (Cave Junction 1946), National Smokejumper Association
Smokejumper Obituary: O'Rourke Jr., Daniel James (Cave Junction 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Upton, Glenn Harrod (Missoula 1959), National Smokejumper Association
Smokejumper Obituary: Upton, Glenn Harrod (Missoula 1959), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Crowley, Charles A. (Cave Junction 1960), National Smokejumper Association
Smokejumper Obituary: Crowley, Charles A. (Cave Junction 1960), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Eggen, Edward J. (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Eggen, Edward J. (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Hydes, John Edward (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Hydes, John Edward (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Martinez, Joe M. "Pipas" (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Martinez, Joe M. "Pipas" (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Collins, Robert Joseph (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Collins, Robert Joseph (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Muehlethaler, Charles Joseph "Charley Joe" (Missoula 1946), National Smokejumper Association
Smokejumper Obituary: Muehlethaler, Charles Joseph "Charley Joe" (Missoula 1946), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Caward, Jac Edmond (Mccall 1951), National Smokejumper Association
Smokejumper Obituary: Caward, Jac Edmond (Mccall 1951), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.