Browsing by Author "John King, Committee Member"
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- Association Genetics for Growth, Carbon Isotope Discrimination and Stem Quality in Loblolly Pine.(2010-06-10) Cumbie, William Patrick; Barry Goldfarb, Committee Chair; Dahlia Nielsen, Committee Member; Ross Whetten, Committee Member; John King, Committee Member; Bailian Li, Committee Member
- Climate Change and the U.S. Forest Service: Opportunities for Adaptation and Mitigation.(2010-11-01) Riddle, Anne; Frederick Cubbage, Committee Chair; Steven McNulty, Committee Member; John King, Committee Member
- The Effect of Hemlock Woolly Adelgid Infestation on Water Relations of Carolina and Eastern Hemlock(2009-01-29) Walker-Lane, Laura Newman; John Frampton, Committee Chair; John King, Committee Member; Fred Hain, Committee Member; Jean-Christophe Domec, Committee MemberIn North America, hemlock woolly adelgid (HWA; Adelges tsugae Annand) is an exotic insect pest from Asia that is causing severe decimation of native eastern hemlock (Tsuga canadensis (L.) Carr.) and Carolina hemlock (Tsuga caroliniana Engelm.). Extensive research has been committed to the ecological impacts and potential control measures of HWA, but the exact physiological mechanisms that cause tree decline and mortality are not known. Eastern and Carolina hemlock may be reacting to infestation in a manner similar to the response of Fraser fir (Abies fraseri (Pursh.) Poir.) to infestation by balsam woolly adelgid (BWA; Adelges picea Ratz.). It is known that Fraser fir produces abnormal xylem in response to BWA feeding. This abnormal xylem obstructs water movement within the trees, causing Fraser fir to die of water-stress. In this study, water relations within 15 eastern and Carolina hemlock were evaluated to determine if infestation by HWA was causing water-stress. Water potential, carbon-13 isotope ratio, stem conductivity, and stomatal conductance measurements were conducted on samples derived from those trees. In addition, branch samples were analyzed for possible wood anatomy alterations as a result of infestation. Pre-dawn branch water potential (Ψ) measurements were more negative in infested hemlock than in non-infested trees. Carbon isotope ratios (normalized δ13C vs. VPDB) of the branches were more positive for infested trees, while stomatal conductance (gs) was lower in infested trees. These results indicate that infested eastern and Carolina hemlock are experiencing drought-like symptoms. Wood anatomy of the branches provided evidence that infested hemlocks are experiencing abnormal wood production in the xylem.
- Modeling Soil Erosion and Sediment Transport from Fires in Forested Watersheds of the South Carolina Piedmont.(2007-08-08) Crumbley, Tyler Autry; Ge Sun, Committee Chair; John King, Committee Member; Steve McNulty, Committee Member
- Phenotypic Analysis of Gene Expression in Proposed Populus Root Development and Growth Genes.(2010-10-01) Wear, Emily; Barry Goldfarb, Committee Chair; John King, Committee Member; Ross Whetten, Committee Member
- Status and soil requirements of Rhus michauxii.(2008-09-22) Willis, Megan Suzanne; John King, Committee Member; Charles Davey, Committee Member; Richard Braham, Committee Chair
