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Articles 271 - 300 of 4004
Full-Text Articles in Forest Management
Smokejumper Obituary: Lowden, Robert G. (Cave Junction 1967), National Smokejumper Association
Smokejumper Obituary: Lowden, Robert G. (Cave Junction 1967), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Stevenson, Vernon M. (Redding 1962), National Smokejumper Association
Smokejumper Obituary: Stevenson, Vernon M. (Redding 1962), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Fire Effects On Soil Organic Matter In The Creek Fire, Gracie E. Doolin
Fire Effects On Soil Organic Matter In The Creek Fire, Gracie E. Doolin
Master of Science in Environmental Sciences and Management Projects
Wildfires have increased in frequency and severity over the past few decades due to the increased concertation of CO2 emissions from anthropogenic influence. Soil carbon (C) sequestration has been identified as a climate change mitigation strategy; however, the influx of large-scale wildfires has accelerated landscape processes such as erosion, reducing soil aggradation, and soil C and nitrogen (N) protection. This trend is highlighted by the Creek Fire that occurred in September 2020 and burned 379,895 acres in the Sierra National Forest. This research is designed to close the knowledge gap regarding the impact of burn severity on soil organic matter …
Remote Sensing Characterization Of Ecosystem Structure And Functional Types To Inform On Biodiversity Conservation In The Lowland Chocó Rainforest, Derek Tesser
Dissertations, Theses, and Capstone Projects
This dissertation focuses on the utilization of remote sensing techniques to characterize ecosystem structure and functional types to inform on biodiversity conservation. This work is motivated by a guiding hypothesis that increased degradation of tropical forest biodiversity due to human activity results in in measurable changes in ecosystem processes that can be detected using remote sensing technologies. Throughout this dissertation, testing of aspects of this hypothesis involve comparing areas with varying degrees of human-induced degradation in a biodiverse tropical ecoregion, the lowland Chocó rainforest of Ecuador. Remote sensing data is used to evaluate changes in vegetation structure, thermal regimes, and …
Modeling The Effect Of Neighborhood Competition On Tree Diameter Growth In The Pacific Northwest Coast Range, Htet Lin Naing
Modeling The Effect Of Neighborhood Competition On Tree Diameter Growth In The Pacific Northwest Coast Range, Htet Lin Naing
Theses and Dissertations
Trees compete for various resources such as sunlight, water, and nutrients, which can be expressed as numerical terms, called competition indices (CI). Competition between individual trees is correlated with their growth and mortality. Therefore, CIs are used as independent variables to develop, improve and modify growth and yield models. This study was conducted to test the effect of neighborhood competition on tree diameter growth among Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), western hemlock (Tsuga heterophylla (Raf.) Sarg) and red alder (Alnus rubra Bong.), in the Pacific Northwest Coast Range, USA. After testing seven distance-independent CIs and three distance-dependent …
Gene Expression Effects On Productivity And Stress Tolerance In Polyclonal Plantings Of Populus Deltoides, Macy Gosselaar
Gene Expression Effects On Productivity And Stress Tolerance In Polyclonal Plantings Of Populus Deltoides, Macy Gosselaar
Theses and Dissertations
Polyclonal plantings of Populus deltoides are expected to display increased site resource use, productivity, and tolerance to stress through plasticity changes leading to niche differentiation (i.e changes to crown/canopy structures). In the present study, P. deltoides Clones S7C8, 110412, and polyclonal plots were tested for differentially expressed genes and enriched biological pathways between planting schemes. Transcriptomic analysis of leaves revealed upregulation of an active growth gene and gene family members that play important roles in plant stress and stress tolerance in polyclonal plantings. A gene associated with oxidative stress was upregulated in polyclonal plantings across all treatments. Secondary metabolic pathways …
Leaf Area Index And Aboveground Biomass Estimation Of Populus And Its Hybrids Using Terrestrial Lidar, Surya Adhikari
Leaf Area Index And Aboveground Biomass Estimation Of Populus And Its Hybrids Using Terrestrial Lidar, Surya Adhikari
Theses and Dissertations
Short rotation woody crops (SRWC) eastern cottonwood (Populus deltoides) and hybrid poplar plantations were established in 2021 in Pontotoc and Oktibbeha counties of Mississippi to study the biomass potential of SRWC for biofuel production. We used a novel backpack LiDAR system to measure forest metrics and harvested sample trees to build aboveground biomass (AGB) and leaf area index (LAI) equations. The results showed that LiDAR-derived variables accurately estimated aboveground biomass (R2 =0.81 and 29.22 % RMSE). However, the LAI estimation results showed that the LiDAR metrics moderately explained field measurements of LAI (R2 =0.31 and 18.05% …
Maximum Size-Density Relationships In Mixed-Species And Monospecific Stands Of The Southeastern United States, Maxwell Robert Schrimpf
Maximum Size-Density Relationships In Mixed-Species And Monospecific Stands Of The Southeastern United States, Maxwell Robert Schrimpf
Theses and Dissertations
Maximum size-density relationships (MSDR) are used to quantify differences across sites in the number of trees of a given size and species that can be supported per hectare. These relationships are important to managers who are trying to maximize basal area and wood volume. In my study, I examined MSDR across Alabama, Georgia, Louisiana, and Mississippi using US Forest Service, Forest Inventory and Analysis (FIA) data. I determined the impact of species-specific, specific gravity, functional traits, and environmental factors on MSDR using a quantile regression approach. Overall, I found that climatic factors had the greatest influence on MSDR, and that …
Effects Of Fire Seasonality On Bachman’S Sparrows In The Longleaf Pine Forests Of Southern Mississippi, Michael D. Warren
Effects Of Fire Seasonality On Bachman’S Sparrows In The Longleaf Pine Forests Of Southern Mississippi, Michael D. Warren
Theses and Dissertations
The Bachman’s sparrow (Peucaea aestivalis) is a ground-dwelling, pine-obligate species experiencing range-wide population declines due to land development and fire exclusion. We explored the effects of fire seasonality on wintering Bachman’s sparrow abundance in Southern Mississippi from 2021-2022. We used generalized linear mixed models to investigate differences in sparrow abundance and vegetation characteristics following dormant and growing season fire. We explored the effects of growing season fire on breeding territory vegetation characteristics. Our results indicate that burn type (dormant vs. growing season), native grass groundcover, and shrubs over 1m were the most significant predictors for wintering Bachman’s sparrow …
A Silvicultural Approach To Increase Drought Resistance And Resilience In Longleaf Pine, Kyle R. Dues
A Silvicultural Approach To Increase Drought Resistance And Resilience In Longleaf Pine, Kyle R. Dues
Theses and Dissertations
Droughts are a common disturbance experienced by forest systems across the southeastern United States and are expected to increase in frequency in the near future. Few empirical studies have evaluated the response of individual tree resistance and resilience following silvicultural treatment in longleaf pine (Pinus palustris Mill.). This study evaluates the differences in drought responses between two forests during three different periods. The first period evaluated pretreatment (2000) conditions, while the second (2006), and third (2011) compared conditions after the implementation of five silvicultural treatments. The main findings are that, as additional basal area is removed, both individual tree …
Timing Is Everything: Impacts Of Firing Technique And Season On Plant Communities In The Southeastern United States, Luke Michael Resop
Timing Is Everything: Impacts Of Firing Technique And Season On Plant Communities In The Southeastern United States, Luke Michael Resop
Theses and Dissertations
Prescribed fire is a common land management tool in the southeastern United States. Historical fires occurred primarily in the growing season, but modern day prescribed fire is commonly restricted to the dormant season. Plant community responses to various fire regimes are relatively unknown, and managers require information on how fire regimes impact plant communities. To address these limitations, I studied the impacts of March and June fire on plant communities. Results indicated various woody midstory species respond differently to fire season and community response is driven by species composition. In another study, I examined impacts of February, May-June, and September-October …
Smokejumper Obituary: Kruckeberg, Robert F. "Bob" (North Cascades 1951), National Smokejumper Association
Smokejumper Obituary: Kruckeberg, Robert F. "Bob" (North Cascades 1951), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Prescribed Fire Use Among Black Landowners In The Red Hills Region, Usa, Cynthia Twyford Fowler, La’ Portia J. Perkins, Adam Coates, J. Kevin Hiers, Seth W. Bigelow
Prescribed Fire Use Among Black Landowners In The Red Hills Region, Usa, Cynthia Twyford Fowler, La’ Portia J. Perkins, Adam Coates, J. Kevin Hiers, Seth W. Bigelow
Faculty Scholarship
The Red Hills Region of southern Alabama, northern Florida, and southwestern Georgia is one of the most prominent areas in the United States for conducting prescribed fire research and is the birthplace of fire ecology. The culture of prescribed burning in the Red Hills has been influenced by multiple ethnic groups, including the Seminole and Creek nations, Black landowners, and White researchers. Given the distinctive reliance of the region on prescribed fire, it is noteworthy that the combined issues of Black land loss, underrepresentation, and incentives for using prescribed fire on private lands in the southeastern United States have generated …
Exploring And Testing Wildfire Risk Decision-Making In The Face Of Deep Uncertainty, Bart R. Johnson, Alan A. Ager, Cody Evers, David Hulse, Max Nielsen-Pincus, John P. Bolte
Exploring And Testing Wildfire Risk Decision-Making In The Face Of Deep Uncertainty, Bart R. Johnson, Alan A. Ager, Cody Evers, David Hulse, Max Nielsen-Pincus, John P. Bolte
Environmental Science and Management Faculty Publications and Presentations
We integrated a mechanistic wildfire simulation system with an agent-based landscape change model to investigate the feedbacks among climate change, population growth, development, landowner decision-making, vegetative succession, and wildfire. Our goal was to develop an adaptable simulation platform for anticipating risk-mitigation tradeoffs in a fire-prone wildland– urban interface (WUI) facing conditions outside the bounds of experience. We describe how five social and ecological system (SES) submodels interact over time and space to generate highly variable alternative futures even within the same scenario as stochastic elements in simulated wildfire, succession, and landowner decisions create large sets of unique, path-dependent futures for …
Patterns And Drivers Of Wiregrass Gap Longleaf Pine (Pinus Palustris Mill.) Woodland Succession As Part Of Restoration Efforts, Armin Weise
All Theses
Longleaf Pine (Pinus palustris) communities are widespread throughout the Southeastern United States with a dominant understory vegetation of wiregrass (Aristida spp.) in most of its range. A small area in central South Carolina that is naturally free of wiregrass is called the “Wiregrass Gap”. Here, the understory vegetation is dominated by bluestems grasses (Andropogon spp. and Schizachyrium spp.) which drive the disturbance regime of frequent low-intensity fire. The successful establishment of these grasses is key for longleaf pine woodland restoration efforts in this region, but few resources detail the ecological drivers at play that enable successful restoration in these longleaf …
Smokejumper Obituary: Jemmett, Coy Grant (Mccall 1963), National Smokejumper Association
Smokejumper Obituary: Jemmett, Coy Grant (Mccall 1963), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Stevens, Louis Wirth "Lou" (North Cascades 1951), National Smokejumper Association
Smokejumper Obituary: Stevens, Louis Wirth "Lou" (North Cascades 1951), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Mayrand, Edward J. (Missoula 1950), National Smokejumper Association
Smokejumper Obituary: Mayrand, Edward J. (Missoula 1950), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Deinema, John William "Jack" (Mccall 1950), National Smokejumper Association
Smokejumper Obituary: Deinema, John William "Jack" (Mccall 1950), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Lince, Jack L. (North Cascades 1950), National Smokejumper Association
Smokejumper Obituary: Lince, Jack L. (North Cascades 1950), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Lenker, Burton John "Burt" (Mccall 1947), National Smokejumper Association
Smokejumper Obituary: Lenker, Burton John "Burt" (Mccall 1947), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Hawley, Clyde Augustus (Idaho City 1948), National Smokejumper Association
Smokejumper Obituary: Hawley, Clyde Augustus (Idaho City 1948), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Tutt, George Thomas "Tom" (Missoula 1964), National Smokejumper Association
Smokejumper Obituary: Tutt, George Thomas "Tom" (Missoula 1964), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Laney, William Shelby "Bill" (Grangeville 1963), National Smokejumper Association
Smokejumper Obituary: Laney, William Shelby "Bill" (Grangeville 1963), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Obituary: Smerker, David Anthony (Missoula 2004), National Smokejumper Association
Smokejumper Obituary: Smerker, David Anthony (Missoula 2004), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Controlling Soil Erosion After Wildfire And Guiding Recovery In Southern Utah, Kristina Young, Kara Dohrenwend, Matt Mcettrick, Henry Grover
Controlling Soil Erosion After Wildfire And Guiding Recovery In Southern Utah, Kristina Young, Kara Dohrenwend, Matt Mcettrick, Henry Grover
All Current Publications
Wildfire is a natural part of many ecosystems in the Four Corners region (Southern Utah, Northern Arizona, Southwest Colorado, and Northwest New Mexico). However, after decades of fire suppression, the intensity and size of wildfires is increasing. This fact sheet is intended to help those in dry, monsoonal regions understand what happens to land after a wildfire and explains the processes of soil erosion. It outlines factors that influence how wildfire can affect soils and plants and provides suggestions for reducing soil erosion when necessary. The information presented is relevant to both private landowners and public lands managers whose landscapes …
Smokejumper Obituary: Knapp, Byron H "Skip" (Pilot 0000), National Smokejumper Association
Smokejumper Obituary: Knapp, Byron H "Skip" (Pilot 0000), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.
Smokejumper Magazine, July 2023, National Smokejumper Association
Smokejumper Magazine, July 2023, National Smokejumper Association
Smokejumper and Static Line Magazines
Message from the President; Denali, the Great One—An Early Ascent of North America's Highest Peak; The Jump List; Motorcycles Are Not Approved for Packouts; Randy Hurst; Small Town Connections; Lost Horizons; Odds and Ends; Whites OFF The Breaks; Moose Tracks in the Timber; Notes from the Ranks; Sounding Off from the Editor; Jack Demmons Remembered; Fighting Wildfire During Extreme Burning Conditions; "Too Steep and Too Rough"; Off the List; Not Forgotten; Public Involvement; So - Is There a Fee?; Fire Jumps in One Season; The Legend of Black Water Canyon;
Do Species Matter? Examining The Niche Of White Ash (Fraxinus Americana L.) And Estimating Potential Subcanopy Effects Of Its Loss In North-Temperate Forests, Elizabeth Anne Studer
Do Species Matter? Examining The Niche Of White Ash (Fraxinus Americana L.) And Estimating Potential Subcanopy Effects Of Its Loss In North-Temperate Forests, Elizabeth Anne Studer
Dartmouth College Ph.D Dissertations
To understand the downstream consequences of the extinction of a species, we must understand its role in an ecosystem. With the impending extirpation of ash (Fraxinus spp.) due to the invasive emerald ash borer (Agrilus planipennis), understanding the role of ash trees is critical to predicting whether its loss will precipitate further species declines and/or ecosystem functions. We evaluated whether subcanopy microbial, invertebrate, and floral communities under four tree species (white ash, American beech, yellow birch, sugar maple) and on two soil hydropedological types (Bh podzol and Typical podzol) varied in species richness, composition, and functional traits in a factorial …
Smokejumper Obituary: Webster, Robert Lyle "Bob" (Missoula 1955), National Smokejumper Association
Smokejumper Obituary: Webster, Robert Lyle "Bob" (Missoula 1955), National Smokejumper Association
Smokejumper Obituaries
No abstract provided.