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Showing 1 to 20 of 253 for “"Quercus"”.
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Solar drying of green oak (Quercus spp.) lumber
A comparison was made of the rates and quality of solar and air drying from the green condition of a mixture of red and white oak 5/4 inch lumber during winter conditions in Blacksburg, Virginia. The solar kiln was of a semi-greenhouse type, having a capacity of 150 board feet and provided with an …
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Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)
Extreme weather events are a growing focus of global climate change research. Extreme events, which occur abruptly and unpredictably, are often more detrimental to terrestrial vegetation than gradual shifts in climate. One type of event, the summer heat wave, may already be increasing in some areas …
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"Determining the Cause of Abnormal Leaf Development ""Leaf Tatters"" on White Oak (Quercus Alba L.), and Northern Red Oak (Quercus Rubra L.)"
Emerging leaves of white oak and to a lesser extent northern red oak can develop abnormally. This abnormality is referred to as leaf tatters. The cause of tatters has previously been linked to environmental stress, insect feeding, or herbicide drift. We theorized that herbicide drift was the cause …
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Fungi associated with northern red oak (Quercus rubra ) acorns
Poor regeneration of northern red oak is widespread in the central hardwood region. A two-part study was conducted to determine what fungi are associated with and cause cotyledon discoloration of northern red oak acorns. The field study determined that simulated small mammal notching, surface …
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Growth hormones and their relationship to seed dormancy in Quercus
Northern red oak (Q. rubra L.) seeds were dormant and required 10 weeks of moist, cold stratification before a large percentage of the seeds would germinate. White oak (Q. alba L.) seeds were not dormant and germinated immediately upon falling from the mother tree. A transfer of mass from the …
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Site quality factors affecting Acer saccharum, Quercus rubra and Quercus alba abundance and height growth rates in young even-aged stands located in central Missouri
Sugar maple importance has been increasing in Missouri's forest for the previous several decades. Managers have little information to guide them with selecting silviculture treatments for managing this increasingly important species. I examined the effects that soil water, soil nutrients, and …
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Physiological variation of Garry oak (Quercus garryana) seedlings to drought stress
… in drought response among Garry oak (<em>Quercus garryana</em> Douglas ex Hook. [Fagaceae]) seedlings that grow in distinct populations in Washington state, in order to aid in restoration efforts by informing growers of the potential differences between the acorn collection sites. Acorns …
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Influencia de la luz y la sequía estival en la respuesta funcional de brinzales de Quercus petraea (Matt.) Liebl. y Quercus pyrenaica Willd. : implicaciones para la regeneración
El estudio de las respuestas funcionales de brinzales de roble albar (Q. petraea) y melojo (Q. pyrenaica) a la disponibilidad de luz y agua constituye la base para un buen conocimiento de su capacidad de regeneración. En el desarrollo de esta tesis se ha evaluado la capacidad de aclimatación a la …
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A range-wide disturbance history for Quercus alba in the eastern US
… US, forests are undergoing a transition from Quercus to Acer-Fagus dominance. While the pattern has been reported in many site-specific analyses and is often linked to changes in disturbance regimes, a landscape-level analysis of historical establishment and disturbance throughout the region …
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Responses of Quercus alba L. seedlings to fertilization with nitrogen and phosphorus
… growth and foliar N and P concentrations of 1-0 Quercus alba seedlings were evaluated one year after planting and fertilization. Soil P tests were made by three methods: dilute acid extractable P (Mehlich), acid flouride extractable P (Bray no. 1), and total P by perchloric acid digestion. …
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Bud-forcing and in vitro culture for conservation of oak (Quercus L.)
Oaks (Quercus L.) are globally iconic trees, prized for their contributions as a keystone species, strong, rot-resistant wood, and landscape value. Despite their importance, many species of Quercus are under threat from a range of issues, such as habitat loss and attacks from pests and diseases. …
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Chemical interactions between rainfall and northern red oak (Quercus rubra l.) foliage
Nutrient ion exchange was examined between simulated acid rain solutions and northern red oak (Ouercus rubra L.) leaves of trees growing in fertile, limestone-derived soil and less fertile, sandstone/shale-derived soil. Leaves harvested from trees growing on the fertile site had greater …
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Check reduction in red oak (Quercus spp.) lumber using diffusion resistant coatings
Approximately five percent of the volume of red oak lumber which is harvested for use in the furniture and flooring industries in the United States is unusable due to surface checking. This thesis investigated the possibility of reducing surface checking by controlling the lumber boundary …
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Community Structure of Parasitoids Attacking Leaf Galls of Belonocnema treatae on Quercus fusiformis
… Cynipidae) which induces leaf galls on Quercus fusiformis. Four specific objectives are examined: 1) determining the diversity and relative abundance of the parasitoid community members, 2) defining the specific niche dimensions of each parasitoid species in relation to size of gall …
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Morphologic and Phenolic Variation in Quercus Alba and Q. Stellata: Evidence For Hybridization
Morphologic and phenolic variation were studied at the intrapopulation and interspecific level for Q. alba L. and Q. stellata Wang. using three sites in the Southwest Missouri area. Morphologic results question the taxonomic significance of Forma alba and Forma latiloba within Q. alba. Discriminant …
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Development of floral primordia and prediction of flowering in white oak (Quercus alba L.)
… staminate and pistillate primordia of white oak (Quercus alba L.). It was found that staminate inflorescences are initiated in late spring and staminate flowers are structurally mature before the onset of dormancy in October. Pistillate inflorescences are not initiated until late summer, and …
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Growth and demography of Quercus coccinea and Q. prinus ramets and genets after clearfelling
Growth and mortality of ramets (stump sprouts) and genets (sprout clumps) of scarlet and chestnut oak were examined on three sites at ages 1-2 (YRI-2), 4-5 (YR4-5) and 7-8 (YR 7-8). Based on a test of the older site with the younger using 2-year-old data, it was concluded that the two populations …
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Live Oak (<em>Quercus virginiana</em>) Recruitment and Seedling Survivorship in a Southern Maritime Forest
… depth on seedling recruitment. Live oak (<em>Quercus virginiana</em>) was the species utilized for this study. Restoration methods were compared in Kenan Field on Sapelo Island, Georgia during the winter and autumn of 2003. One hundred fifty acorns were directly sown on the soil surface and …
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