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Articles 1 - 30 of 95
Full-Text Articles in Other Forestry and Forest Sciences
Exploring The Relationship Between Tree Dbh And Lichen Cover On Coast Redwood, Grace M. Personeus, Sierra Gittleman, Alisa A. Zarattini
Exploring The Relationship Between Tree Dbh And Lichen Cover On Coast Redwood, Grace M. Personeus, Sierra Gittleman, Alisa A. Zarattini
IdeaFest: Interdisciplinary Journal of Creative Works and Research from Cal Poly Humboldt
We investigated the relationship between Diameter at Breast Height (DBH) and lichen cover on coast redwood (Sequoia sempervirens) to see if larger trees had higher percentages of cover. We measured cover using 10 cover classes on the southeastern and southwestern sides of trees in a secondary growth forest. We found a significant relationship between DBH and cover, yet no significant difference between the two sides measured. We suggest that further research with a larger sample size and more varied age classes will provide further insight into the relationship.
Forest Overstory Mortality & Recruitment Patterns Eight Years Following Wildfire In The Southern Appalachians, Ruth Cumberland
Forest Overstory Mortality & Recruitment Patterns Eight Years Following Wildfire In The Southern Appalachians, Ruth Cumberland
All Theses
In this study, we investigated patterns of forest overstory mortality and recruitment eight years after wildfire in a large wildfire site the Southern Appalachians, a topic that has not been thoroughly investigated to date. With evidence that pre-fire drought promotes post-fire mortality through impaired physiological function and increased fuel consumption, unknown patterns following wildfire are important to study under shifting climate and land-use conditions. In Chapter 1, three areas of interest were investigated: (a) functional group mortality response to wildfire effects, (b) temporal differences in early (1-3 years) and late (5-8 years) periods of delayed forest overstory mortality patterns following …
Limited Soil Water Recharge In Summer Affects Seasonal Isotopic Signatures Of Tree Xylem Water, Marius G. Floriancic, Gregory R. Goldsmith, Harsh Beria, Scott T. Allen, James W. Kirchner
Limited Soil Water Recharge In Summer Affects Seasonal Isotopic Signatures Of Tree Xylem Water, Marius G. Floriancic, Gregory R. Goldsmith, Harsh Beria, Scott T. Allen, James W. Kirchner
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Recent studies have reported that xylem waters in forest trees during the summer growing season are often isotopically similar to winter, rather than summer, precipitation. Several hypotheses have been proposed to explain this observation, which can be viewed as a form of ecohydrological separation, but empirical tests spanning space and time remain limited. We hypothesise that variations in the seasonal origin of precipitation found in tree xylem waters can be explained by seasonal differences in soil water recharge. We test this hypothesis by evaluating to what extent climatic aridity can explain seasonal signals in extensive surveys of the isotope ratios …
The Everyday Scientist: Down In The Weeds In The Heart Of The South, Pamela Zendt
The Everyday Scientist: Down In The Weeds In The Heart Of The South, Pamela Zendt
Master's Projects
The Everyday Scientist: Down in the Weeds in the Heart of the South is a creative nonfiction capstone project that was released as a book. The narrative documents my two-year journey as a community scientist and explores how ordinary people contribute meaningfully to scientific research in the natural world. Rooted in my desire to connect my passion for the outdoors with the goals of the Master of Arts in Professional Writing program, this project illustrates that environmental science is not only for trained professionals. Instead, it thrives on the curiosity, dedication, and participation of volunteers who follow established protocols, collect …
Scaling Individual Tree Transpiration With Thermal Cameras Reveals Interspecies Differences To Drought Vulnerability, Mostafa Javadian, Donald M. Aubrecht, Joshua B. Fisher, Russell L. Scott, Sean P. Burns, Jen L. Diehl, J. William Munger, Andrew D. Richardson
Scaling Individual Tree Transpiration With Thermal Cameras Reveals Interspecies Differences To Drought Vulnerability, Mostafa Javadian, Donald M. Aubrecht, Joshua B. Fisher, Russell L. Scott, Sean P. Burns, Jen L. Diehl, J. William Munger, Andrew D. Richardson
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Understanding tree transpiration variability is vital for assessing ecosystem water-use efficiency and forest health amid climate change, yet most landscape-level measurements do not differentiate individual trees. Using canopy temperature data from thermal cameras, we estimated the transpiration rates of individual trees at Harvard Forest and Niwot Ridge. PT-JPL model was used to derive latent heat flux from thermal images at the canopy-level, showing strong agreement with tower measurements (R2 = 0.70–0.96 at Niwot, 0.59–0.78 at Harvard at half-hourly to monthly scales) and daily RMSE of 33.5 W/m2 (Niwot) and 52.8 W/m2 (Harvard). Tree-level analysis revealed species-specific responses to …
Automated Tree Mortality Detection Using Ubiquitously Available Public Data, Michael T. Huggins
Automated Tree Mortality Detection Using Ubiquitously Available Public Data, Michael T. Huggins
Master's Theses
Understanding the dynamic interplay between fire severity, topography, and tree mortality, is crucial for predicting future forest dynamics and enhancing resilience against climate change-induced wildfire regimes. This thesis develops a multi-sensor approach for automated estimation of tree mortality, then applies it to examine trends in tree mortality over a six-year period across a fire affected study site in the Trinity River basin in Northern California. The Random Forest model uses publicly available USGS 3D Elevation Program Lidar (3DEP) and NAIP imagery as inputs and is likely to be easily adaptable to other landscapes. The model had a Receiver Operating Characteristic …
Environmental Biology Masters Capstone, Antonio Gonzalez-Pita
Environmental Biology Masters Capstone, Antonio Gonzalez-Pita
Regis University Student Publications (comprehensive collection)
Human wildlife interactions (HWI) pose a complex challenge for wildlife managers. Human encroachment into wildlife habitat and the growing number of outdoor recreationists are increasing the frequency of contact and conflict, especially in regions such as the Front Range of Colorado. Geographic information systems (GIS), which use a combination of remote sensing and environmental survey data, allow for predictive spatial analyses of where human wildlife interactions are likely to occur. I used publicly reported observations of moose to create spatial predictive maps in a species distribution model framework. Slope and elevation were shown to be the strongest predictors of HWI, …
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 …
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 …
Assessing The Recovery Of Forest Understory Vegetation After Clearcut Logging Across A 445-Year Chronosequence, Molly Smith Metok
Assessing The Recovery Of Forest Understory Vegetation After Clearcut Logging Across A 445-Year Chronosequence, Molly Smith Metok
Cal Poly Humboldt theses and projects
The conversion of natural forested lands to managed forests has reduced the amount of older, structurally diverse forests worldwide. In conifer forests of the Pacific Northwest (USA) – where the understory plant communities comprise only 1% of forest biomass but represent 90% of the plant species richness – the long-term impacts of timber harvesting are not fully understood. I used a chronosequence of forests in southwestern Oregon that ranged from 25 to 445 years of age to compare changes in plant communities in logged (i.e., managed) stands with that of stands in late succession and old growth conditions. The chronosequence …
Quantifying The Carbon Stored And Sequestered By The Trees On Pomona College’S Campus, Paola A. Giron-Carson
Quantifying The Carbon Stored And Sequestered By The Trees On Pomona College’S Campus, Paola A. Giron-Carson
Scripps Senior Theses
We are experiencing a climate crisis that must be confronted with strategic mitigation. Pomona College contributes to the climate crisis through its emissions for which there is a baseline record. However there is no baseline record of the climate mitigation currently performed by the trees on Pomona’s campus through carbon storage. This study seeks to determine a current baseline quantity of carbon stored and sequestrated by Pomona’s trees as well as possible courses of climate mitigation for Pomona College to take. Initial information gathering was conducted through interviews with several stakeholders. This study was conducted using data collected prior to …
Flora Of Doe Mountain Recreation Area, Johnson County, Tennessee, Benjamin Mccullough
Flora Of Doe Mountain Recreation Area, Johnson County, Tennessee, Benjamin Mccullough
Electronic Theses and Dissertations
A botanical inventory of Doe Mountain Recreation Area (DMRA) in northeastern Tennessee was conducted to help guide conservation-based management. A total of 484 species were found in DMRA, comprising 94 families, and 285 genera, 10 species listed in the state rare plant list, and 76 exotic species. Two species, Liatris virgata and Lycopodiella inundata, were new state records. Water in the Lycopodiella seep was an order of magnitude more acid than at other sites. An analysis of the wildland-urban interface showed that only 13% of the area was classified as uninhabited. The inventory-invasion index, introduced to quantify the relative …
Contribución A La Conservación De La Orquídea Rodriguezia Granadensis (Lindl.) Rchb.F. En La Hacienda Betania (Fusagasugá, Colombia), Arlette Ivonne Gil Clavijo, Jenny Paola Moreno Lopez, Laguandio Del Cristo Banda Sánchez
Contribución A La Conservación De La Orquídea Rodriguezia Granadensis (Lindl.) Rchb.F. En La Hacienda Betania (Fusagasugá, Colombia), Arlette Ivonne Gil Clavijo, Jenny Paola Moreno Lopez, Laguandio Del Cristo Banda Sánchez
Ciencias Agropecuarias
Esta cartilla, creada por el Grupo de Investigación PROSAFIS de la Universidad de Cundinamarca, presenta los resultados del proyecto Aproximación a la ecología de orquídeas nativas en el ecosistema hacienda Betania con proyección a su conservación, manejo y producción. Se destaca la orquídea Rodriguezia granadensis, adaptada a forofitos (phorophytes) de cítricos y guayabos, representando el 83,3 % de los individuos observados. Predominó la fase vegetativa (fenología) durante todo el período, con más floración y cápsulas en épocas lluviosas, sincronizando su fase reproductiva con el régimen de lluvias. En las raíces se encontró el hongo endófito (endophyte) Rhizoctonia en …
Environmental Data: Geospatial And Elevation Data, Albert J. Burky, Julia I. Chapman, Ryan W. Mcewan
Environmental Data: Geospatial And Elevation Data, Albert J. Burky, Julia I. Chapman, Ryan W. Mcewan
Data Files: Drew Woods Permanent Plots
GPS Coordinates, Elevation, and Distance to Edge data for 32 sample plots in Drew Woods State Nature Preserve in Darke County, OH. Data key is provided in a supplemental file.
Quantitative Analysis Of Phytochemical Compounds In Barks And Leaves Of Okoubaka Aubrevillei Collected From Iwo, Southwestern Nigeria, Oluwatoyin Opeyemi Akintola, Adeboyin Funmi Aderounmu, Isaac Oluwaseyi Abiola, Kolawole Emmanuel Abodurin, Tunde Adeniran, Festus Agboola, Oluwayemisi Samuel Olokeogun
Quantitative Analysis Of Phytochemical Compounds In Barks And Leaves Of Okoubaka Aubrevillei Collected From Iwo, Southwestern Nigeria, Oluwatoyin Opeyemi Akintola, Adeboyin Funmi Aderounmu, Isaac Oluwaseyi Abiola, Kolawole Emmanuel Abodurin, Tunde Adeniran, Festus Agboola, Oluwayemisi Samuel Olokeogun
Journal of Bioresource Management
Okoubaka aubrevillei is an indigenous and sacred tropical tree in Africa. It is rare with allelopathic properties and has relatively little information available in terms of what is responsible for its usage for medicinal and traditional usage. The phytochemical screening and quantitative analysis of the compounds in the barks and leaves of Okoubaka aubrevillei was determined to ascertain and establish its earlier claimed usage as traditional and modern medicine. The most important classes of secondary metabolites (phytochemical compounds) specifically alkaloids, flavonoids, tannins, saponins, anthraquinnes, mucilages, oses, holosides, coumarin and glycosides were detected in both, the leaves and barks of the …
A Floristic Survey Of Andalusia: A Historic Preservation Site In Baldwin County, Georgia, William Pharr
A Floristic Survey Of Andalusia: A Historic Preservation Site In Baldwin County, Georgia, William Pharr
Biology Theses
A survey of the vascular plants of Andalusia, a historic preservation site located along Highway 441 north of Milledgeville in Baldwin County, Georgia, was conducted between August 2018 and February 2020. The site was the late home of esteemed author, Flannery O’Connor, and resides along the Georgia fall line, making it a historically significant area that could yield a unique plant community convergence, as well as rare endemic species. This floristic inventory provides baseline data on the species and plant communities of Andalusia for use in future studies regarding the flora of this area. A total of 191 vascular species …
Interspecific Gene Flow Potentiates Adaptive Evolution In A Hybrid Zone Formed Between Pinus Strobiformis And Pinus Flexilis, Mitra Menon
Theses and Dissertations
Species range margins are often characterised by high degrees of habitat fragmentation resulting in low genetic diversity and higher gene flow from populations at the core of the species range. Interspecific gene flow from a closely related species with abutting range margins can increase standing genetic diversity and generate novel allelic combinations thereby alleviating limits to adaptive evolution in range margin populations. Hybridization driven interspecific gene flow has played a key role in the demographic history of several conifer due to their life history characteristics such as weak crossability barriers and long generation times. Nevertheless, demonstrating whether introgression is adaptive …
Fire And Road Disturbance Impacts On Forest Plant Species And Seed Rain In Table Mountain Fire Arai, Kittitas County, Washington, Jonathan A. Betz
Fire And Road Disturbance Impacts On Forest Plant Species And Seed Rain In Table Mountain Fire Arai, Kittitas County, Washington, Jonathan A. Betz
All Master's Theses
Forest communities are in a constant state of change. Disturbance events can alter the physical landscape and create conditions favorable to some species while negatively impacting others. Fire has been a natural, reoccurring source of disturbance in Pacific Northwest forests. Over the past centuries the fire paradigm has changed in favor of fire suppression. Forest roads permit access provide greater access but further fracture forest community’s continuity. The 2012 Table Mountain Fire and road influence have altered the plant community’s seed rain and vegetation. This study measured dispersed seeds and understory vegetation cover as functions of roads and fire intensity. …
Quantifying The Environmental Performance Of A Stream Habitat Improvement Project, Cody Morse
Quantifying The Environmental Performance Of A Stream Habitat Improvement Project, Cody Morse
Master's Theses
River restoration projects are being installed worldwide to rehabilitate degraded river habitat. Many of these projects focus on stream habitat improvement (SHI), and an estimated 60%of the 37,000 projects listed in the National River Restoration Science Synthesis Program focus on SHI for salmon and trout species. These projects frequently lack a sufficient monitoring program or account for the environmental costs associated with SHI. The present study used life cycle assessment (LCA) techniques and topographic effectiveness monitoring to quantify environmental costs on the basis of geomorphic change. This methodology was a novel approach to assessing the cost-benefit relationship of SHI. To …
Oaks (Family: Fagaceae) Diversity From Moist Temperate Forests Of Lesser Himalayas, Pakistan, Sher Wali, Kishwar Sultana, Fida Muhammad Khan
Oaks (Family: Fagaceae) Diversity From Moist Temperate Forests Of Lesser Himalayas, Pakistan, Sher Wali, Kishwar Sultana, Fida Muhammad Khan
Journal of Bioresource Management
A detailed survey was conducted in five national parks and game reserves of Azad Jammu and Kashmir, Pakistan to assess the biodiversity of family Fagaceae. Identification of the species was done using literary sources and comparison of samples with herbaria from Quaid-i-Azam University, Islamabad and Pakistan Museum of Natural History, Islamabad, Pakistan. A total of eight different species belonging to two genera were identified, including Quercus spp., Castanea sativa, Quercus glauca, Quercus baloot, Quercus incana, Quercus velutina, Quercus alba and Quercus dilatata. The greatest biodiversity was found in Banjosa Game Reserve (BGR) and Tolipir National Park (TNP), while Pir …
Herbaceous 2018, Julia I. Chapman, Margaret E. Maloney, Ryan W. Mcewan
Herbaceous 2018, Julia I. Chapman, Margaret E. Maloney, Ryan W. Mcewan
Data Files: Drew Woods Permanent Plots
Herbaceous vegetation data collected in 2018 at Drew Woods State Nature Preserve in Darke County, OH. Data key is provided in a supplemental file.
Bankfull Width, Kevin W. Custer, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Bankfull Width, Kevin W. Custer, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Data Files
No abstract provided.
Overstory, Erin C. Rowekamp, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Overstory, Erin C. Rowekamp, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Data Files
No abstract provided.
Herbaceous Vegetation: April, Julia I. Chapman, Margaret E. Maloney, Erin C. Rowekamp, Mitchell J. Kukla, Sean D. Mahoney, Eric B. Borth, Ryan W. Mcewan
Herbaceous Vegetation: April, Julia I. Chapman, Margaret E. Maloney, Erin C. Rowekamp, Mitchell J. Kukla, Sean D. Mahoney, Eric B. Borth, Ryan W. Mcewan
Data Files
April
Macroinvertebrates, Mitchell J. Kukla, Corey Kuminecz, Margaret E. Maloney, Joseph Murphy, Taylor M. Buskey, Jenea I. Adams, Michelle N. Little, Eric B. Borth, Taylor M. Sparbanie, Sean D. Mahoney, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Macroinvertebrates, Mitchell J. Kukla, Corey Kuminecz, Margaret E. Maloney, Joseph Murphy, Taylor M. Buskey, Jenea I. Adams, Michelle N. Little, Eric B. Borth, Taylor M. Sparbanie, Sean D. Mahoney, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Data Files
No abstract provided.
Conventional Method Comparison Data (Ves And Hess), Margaret E. Maloney, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Conventional Method Comparison Data (Ves And Hess), Margaret E. Maloney, Eric B. Borth, Julia I. Chapman, Ryan W. Mcewan
Data Files
No abstract provided.
Herbaceous Vegetation: June, Julia I. Chapman, Margaret E. Maloney, Erin C. Rowekamp, Mitchell J. Kukla, Sean D. Mahoney, Eric B. Borth, Ryan W. Mcewan
Herbaceous Vegetation: June, Julia I. Chapman, Margaret E. Maloney, Erin C. Rowekamp, Mitchell J. Kukla, Sean D. Mahoney, Eric B. Borth, Ryan W. Mcewan
Data Files
June
Lonicera Maackii Leaf Feeding Tests: Survival, Growth, Loss Of Leaf Mass, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Lonicera Maackii Leaf Feeding Tests: Survival, Growth, Loss Of Leaf Mass, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Data Files
Lymnaea stagnalis, Hyalella Azteca, and Allocapnia spp.
Lonicera Maackii Leaf Leachate Toxicity: Physicochemical Data, Eric B. Borth, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Lonicera Maackii Leaf Leachate Toxicity: Physicochemical Data, Eric B. Borth, Kevin W. Custer, Julia I. Chapman, Ryan W. Mcewan
Data Files
Lymnaea stagnalis and Hyalella azteca
Natural And Anthropogenic Drivers Of Tree Evolutionary Dynamics, Brandon M. Lind
Natural And Anthropogenic Drivers Of Tree Evolutionary Dynamics, Brandon M. Lind
Theses and Dissertations
Species of trees inhabit diverse and heterogeneous environments, and often play important ecological roles in such communities. As a result of their vast ecological breadth, trees have become adapted to various environmental pressures. In this dissertation I examine various environmental factors that drive evolutionary dynamics in threePinusspecies in California and Nevada, USA. In chapter two, I assess the role of management influence of thinning, fire, and their interaction on fine-scale gene flow within fire-suppressed populations of Pinus lambertiana, a historically dominant and ecologically important member of mixed-conifer forests of the Sierra Nevada, California. Here, I find evidence …