Forest Sciences Commons^™

Effects Of High Temperature Stress On Enzymatic And Nonenzymaticantioxidants And Proteins In Strawberry Plants, Sergül Ergi̇n, Hati̇ce Gülen, Müge Kesi̇ci̇, Ece Turhan, Ahmet İpek, Nezi̇he Köksal

Turkish Journal of Agriculture and Forestry

The mechanism of tolerance to high temperatures was investigated in two strawberry (Fragaria x ananassa Duch) cultivars, 'Redlands Hope' ('R. Hope', heat tolerant) and 'Cal. Giant 3' ('CG3', heat sensitive). Leaves were collected from plants that were exposed to gradual heat stress and heat-shock stress separately. The contents of nonenzymatic antioxidants such as ascorbic acid (AsA) and glutathione (GSH) and the activities of enzymatic antioxidants such as ascorbate peroxidase (APX) (EC 1.11.1.11), catalase (CAT) (EC 1.11.1.6), and glutathione reductase (GR) (EC. 1.6.4.2) were measured followed by heat treatments. Additionally, proline content was determined, and heat shock proteins (HSPs) were analyzed …

Effects Of Water Regimes On Inulin Content And Inulin Yield Of Jerusalem Artichoke Genotypes With Different Levels Of Drought Tolerance, Cholada Aduldecha, Wanwipa Kaewpradit, Nimitr Vorasoot, Darunee Puangbut, Sanun Jogloy, Aran Patanothai

Turkish Journal of Agriculture and Forestry

Drought is a recurring problem of Jerusalem artichoke (Helianthus tuberosus L.) production under rainfed conditions. A better understanding of the responses of Jerusalem artichoke genotypes to drought can lead to the improvement of inulin content and inulin yield in Jerusalem artichoke and its production planning. The objective of this study was to compare the responses of five Jerusalem artichoke genotypes (JA60, JA125, JA5, JA89, and HEL65) to three water regimes (100% available water (AW; field capacity), 50% AW, and 25% AW) for inulin content and inulin yield. The experimental results showed that water regimes and Jerusalem artichoke genotypes were significantly …

Effect Of Different Irradiation Sources And Doses On Haploid Embryoinduction In Altinbas (Cucumis Melo L. Var. Inodorus) Melons, Bariş Dal, Nebahat Sari, İlknur Solmaz

Turkish Journal of Agriculture and Forestry

In vivo induction of parthenogenesis using an irradiated pollen technique provides successful results in melon and accelerates breeding by shortening the time for obtaining 100% homozygous lines. Gamma rays (cobalt-60) are usually used for the pollen irradiation, although it is difficult to find a suitable source for irradiation. Haploid technology is widely used in melon breeding programs, so there is a need to find alternative sources for pollen irradiation. This study was performed to compare the efficiency of different irradiation sources to induce haploid embryos. One dose of cobalt-60 (300 Gy), two different doses (200 Gy and 300 Gy) of …

Genetic Variation Within The Purple Carrot Population Grown In Ereğli District In Turkey, Ahmet İpek, Önder Türkmen, Sali̇ Fi̇dan, Meryem İpek, Harun Karci

Turkish Journal of Agriculture and Forestry

Although the majority of carrots grown in Turkey and around the world are orange, the production of anthocyanin-containing purple carrots has recently increased in Turkey due to the extraction of anthocyanin from these carrots for use as a natural food colorant. Purple carrot production for this purpose is concentrated in Ereğli District in Konya Province, and open-pollinated local purple carrot cultivars or landraces have been used for this production. Genetic variation within the local purple carrot populations in this region is of interest to plant breeders worldwide for the development of new purple carrot cultivars. Therefore, in this study, genetic …

Genetic Analyses Of Turkish Watermelons Based On Srap Markers, Meti̇n Yağcioğlu, Osman Gülşen, İlknur Solmaz, Hali̇t Yeti̇şi̇r, Nebahat Sari

Turkish Journal of Agriculture and Forestry

Genetic studies of watermelons [Citrullus lanatus (Thunb.) Matsum. & Nakai] sampled from Turkey, the second leading producer, may provide valuable information for breeding and research programs. The objectives of this study were to estimate the level of genetic diversity, population structure, and optimum genome sampling size among the Turkish and several introduced watermelons. From the collection, 256 watermelon lines representing all watermelon-growing areas of Turkey along with two accessions of a related genus (Praecitrullus fistulosus (Stocks) Pangalo) and a few popular cultivars were genotyped using sequence-related amplified polymorphism (SRAP) markers. Twenty-seven primers generated 210 molecular markers for genetic analyses. The …

Fatty Acid Composition, Oxidative Stability, And Antioxidant Properties Of Some Hungarian And Other Persian Walnut Cultivars, Geza Bujdoso, Éva Kónya, Mária Berki, Magdolna Nagy-Gasztonyi, Krisztina Bartha-Szügyi, Balázs Marton, Ferenc Izsépi, Nóra Adányi

Turkish Journal of Agriculture and Forestry

Ten different Persian walnut cultivars were examined for their compositional data, including eight Hungarian and two introduced varieties. Oil content and fatty acid composition were determined, as well as oxidative stability (indicated by induction time). Antioxidative capacity, total polyphenol measurements, and individual phenolic compounds were also determined. Not only dry samples but fresh and stored samples were included in this study. Large differences were found among the varieties within these parameters, for example in oxidative stability, which contributes to antioxidative capacity. In conclusion, the nutritional value of Hungarian walnut cultivars was the same or even higher than those of foreign …

Long-Term Impacts Of Fuel Treatments On Tree Growth And Aboveground Biomass Accumulation In Ponderosa Pine Forests Of The Northern Rocky Mountains, Kate A. Clyatt

Graduate Student Theses, Dissertations, & Professional Papers

In western North America, many low-elevation, dry forest types historically experienced frequent, low-severity fires. However, European settlement and fire suppression policies have contributed to over a century of fire exclusion, substantially altering forest structure and composition. There is considerable interest in restoring fire resilient characteristics to these forests through fuel reduction treatments. One limitation of current research on the impacts of fuel treatments is treatment longevity, as few studies have been able to quantify long-term responses to commonly applied treatments. This research evaluated tree growth and aboveground biomass responses 23 years after treatment in two silvicultural installations with different underburning …

Density Management In Young Western Larch Stands: Tree Growth, Stand Yield, And Carbon Storage 54 Years After Thinning, Michael S. Schaedel

Graduate Student Theses, Dissertations, & Professional Papers

Long-term silvicultural experiments can be used to test novel ecological hypotheses and answer contemporary management questions that were not envisioned at study initiation. We used a 54-year old western larch precommercial thinning (PCT) study in northwest Montana to examine two sets of questions: (1) how different PCT regimes affect long-term stand yield and tree growth, and (2) how PCT affects total aboveground carbon (C) storage and distribution among C pools. The study has three target densities (494 trees ha^-1, 890 trees ha^-1, and 1680 trees ha^-1) and three numbers of entries to achieve those …

Performance And Morphology In Sequoiadendron Genotypes Outside Of Their Range, Christopher M. Valness

Cal Poly Humboldt theses and projects

In its current fragmented distribution in 75 groves along the western slope of the Sierra Nevada, Sequoiadendron giganteum (SEGI) may be vulnerable to extreme shifts in environmental conditions such as warming temperatures and drought stress, which may reduce the already limited habitat for SEGI in native groves. Interest in outplanting of this iconic species for the objectives of genetic conservation and timber utilization due to decay resistance of heartwood would be supported by information on population variation to inform seed collection for these plantings. To that end, I assessed three SEGI common-garden trials which had been planted in spring 1981 …

Early Seral Mixed-Conifer Forest Structure And Composition Following A Wildfire Reburn In The Sierra Nevada, Erin Alvey

Cal Poly Humboldt theses and projects

Before the era of modern fire suppression, California’s northern Sierra Nevada mixed-conifer and yellow pine forests were self-regulating; recurring short-interval, low-mixed severity wildfires maintained forest structure and composition, which in turn exerted bottom-up controls on subsequent wildfires. As a result of fire suppression, and coupled with the effects of climate warming and other anthropogenic disturbances, the fundamental structure of mixed-conifer and yellow pine forests has shifted. Wildfires may now be increasing in size, severity, and frequency across western North America. However, little is known about the post-fire impacts of repeat wildfire on a forest after a long era of suppression. …

The Conflict Resolution Case Study In Urban Life: Bull Run Watershed Case, Chang-Yu Hong

Geography Faculty Publications and Presentations

The City of Portland and the United States Department of Agriculture (USDA) Forest Service are working together, along with citizens, to formulate a comprehensive new policy to guide joint management of the Bull Run watershed at Mt. Hood National Forest. This process has brought about four decades of conflict, resulting from differences between the federal view of multiple use and the local view of exclusive use for producing high quality water. The new policy is being formulated by the City of Portland and the Forest Service through negotiation of a comprehensive Memorandum of Understanding that structures the parties’ roles, responsibilities, …

Arbuscular Mycorrhizal Fungi Of Northern White Cedar (Thuja Occidentalis L.): Habitat Effects On Fungal Communities And Inoculum Effects On Plant Growth On Acid Peat Soils, Guswarni Anwar

Dissertations, Master's Theses and Master's Reports

The relationship of arbuscular mycorrhizal (AM) fungi with northern white cedar (NWC) was examined from the perspective of both fundamental questions about habitat specificity in the root fungal community, as well as applied questions regarding AM fungal efficacy in NWC restoration in peat soils. I performed two experiments testing the effects of AM fungi on survival, growth, and nutrition of NWC seedlings; and one molecular study to determine the habitat effects on community composition of NWC root-associated fungi. First, a greenhouse AM inoculation experiment was conducted in factorial combination with fertilization and liming to examine conditional effectiveness of AM fungal …

Effectiveness Of Emerald Ash Borer (Agrilus Planipennis) Trap Placement In Relation To Forest Edges, Karen Cladas

Dissertations, Master's Theses and Master's Reports

Agrilus planipennis, Fairmaire (Order Coleoptera: Family Burprestidae), an invasive insect to North America has caused mortality and decline of millions of Fraxinus trees since its discovery in 2002. A study to evaluate purple prism trap effectiveness in low-to-moderate beetle densities in relation to road proximity and basal area of Fraxinus species was conducted in northern Michigan in 2013 and 2014. Transects of traps were established at set distances from roads during A. planipennis flight season. Analysis indicated a significant relationship between road proximity and trap effectiveness, with traps established on the road edge out-performing traps established in the forest interior. …

Evaluation Of Social License For The Forest Products Industry In Houghton County, Michigan, Will Lytle

Dissertations, Master's Theses and Master's Reports

This research investigates how the local community grants social license to the forest products industry in Houghton County, Michigan. Interviews were conducted with industry and community stakeholders using a snowball sampling method to understand perspectives on the social license continuum. The viability of supply chains and individual industry sectors associated with forest resources in the county are largely governed by macroeconomics. However, there is a very local component that allows individual corporations to operate within the community. The data analysis, based on the interviews, focuses on understanding local perceptions of natural resource management and community relations. The results reflect social …

Effects Of Wildfire And Post-Fire Salvage Logging On Rill Networks And Sediment Delivery In California Forests, Will Olsen

Dissertations, Master's Theses and Master's Reports

Wildfires can increase soil erosion by orders of magnitude over rates in unburned forests and negatively impact aquatic resources. Rill erosion is a dominant erosion and sediment transport mechanism in burned forests, and hydrologically connected rills can form networks on burned hillslopes. At the swale scale (< 10,000 m²), little is known about how rill networks develop under different burn severities over time, their relationship with sediment yields, and the effect of post-fire salvage logging on rill networks and sediment yields.

The first study assessed rill networks and sediment yields in three burn severities in the inland Coast Range of …

Smokejumper Obituary: Lowell, John Harvey (Missoula 1952), National Smokejumper Association

Smokejumper Obituaries

No abstract provided.

The Integration Of African Americans In The Civilian Conservation Corps In Massachusetts, Caitlin E. Pinkham

Graduate Masters Theses

The Civilian Conservation Corps employed young white and black men between the ages of eighteen and twenty-five. In 1935 Robert Fechner, the Director of the Civilian Conservation Corps, ordered the segregation of Corps camps across the country. Massachusetts’ camps remained integrated due in large part to low funding and a small African American population. The experiences of Massachusetts’ African American population present a new general narrative of the Civilian Conservation Corps. The Federal government imposed a three percent African American quota, ensuring that African Americans participated in Massachusetts as the Civilian Conservation Corps expanded. This quota represents a Federal acknowledgement …

Smokejumper Obituary: Johnshoy, Ronald J. (Nifc 1988), National Smokejumper Association

Smokejumper Obituaries

No abstract provided.

Consequences Of Shifts In Abundance And Distribution Of American Chestnut For Restoration Of A Foundation Forest Tree, Harmony J. Dalgleish, Charles Dana Nelson, John A. Scrivani, Douglass F. Jacobs

Forestry and Natural Resources Faculty Publications

Restoration of foundation species, such as the American chestnut (Castanea dentata) that was devastated by an introduced fungus, can restore ecosystem function. Understanding both the current distribution as well as biogeographic patterns is important for restoration planning. We used United States Department of Agriculture Forest Service Forest Inventory and Analysis data to quantify the current density and distribution of C. dentata. We then review the literature concerning biogeographic patterns in C. dentata. Currently, 431 ± 30.2 million stems remain. The vast majority (360 ± 22 million) are sprouts < 2.5 cm dbh. Although this number is approximately 10% of the estimated pre-blight population, blight has caused a major shift in the size structure. The current-day population has a larger range, particularly west and north, likely due to human translocation. While climate change could facilitate northward expansion, limited seed reproduction makes this unlikely without assisted migration. Previous research demonstrates that the current, smaller population contains slightly higher genetic diversity than expected, although little information exists on biogeographic patterns in the genetics of adaptive traits. Our research provides a baseline characterization of the contemporary population of C. dentata, to enable monitoring stem densities …

Restoration Of A Wet Longleaf Pine (Pinus Palustris) Savanna In Southeast Louisiana: Burning Toward Reference Conditions, Alex K. Entrup

LSU New Orleans Theses and Dissertations

This study quantifies the changes in vegetation composition and structure of a fire-excluded Pinus palustris (longleaf pine) wetland savanna restoration site in southeastern in comparison to a proximate contemporary reference site. The restoration site was invaded by hardwood species and off-site pines, and never underwent extensive soil disturbance. The restoration treatments involved logging across portions of the site and the reintroduction of fire across the entire site. All species present in 10m² quadrats were recorded prior to treatment and throughout the 17 year study at reference and treatment sites. The community composition of both logged and unlogged sites converged …