As forests change, tree physiology responds to changes in resource demands. The impact of Pinus taeda (loblolly pine) mortality on physiology of successional hardwoods is unknown. Liquidambar syraciflua (sweetgum) and loblolly pine individuals were measured for resource-use during a simulated southern pine beetle mortality event where several pines underwent a girdling treatment. Sweetgum next to untreated pines had significantly higher sapflow every month, markedly throughout post-mortality months. Sapflow and photosynthetic capacity significantly declined in girdled pines before needle discoloration. Nitrogen concentration of senesced pine and sweetgum leaves significantly increased from pre-mortality to post-mortality. Pine mortality led to increases in sweetgum water use and leaf nitrogen content. A shift in species dominance from loblolly pine to sweetgum would reduce water lost by pine transpiration during sweetgum dormancy by approximately 154 mm. These data indicate significant responses to disturbance and seasonal resource demands in this forest type.

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Thesis (M.S.)--Oregon State University, 2003. / Typescript (photocopy). Includes bibliographical references (leaves 85-92). Also available online.

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My thesis research investigated monoterpene responses in jack pine (Pinus banksiana Lamb.) to different agents to better understand how these responses may influence the spread of the mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) in the boreal forest. The results support that monoterpenes are inducible responses in jack pine. In the first study, methyl jasmonate application elicited the greatest response in juvenile and mature trees suggesting that jasmonic acid plays a role in jack pine defence responses. In the cross-induction study, I found evidence of an increase in resistance to Grosmannia clavigera with prior jack pine budworm defoliation (Choristoneura pinus pinus Freeman; JPBW). In contrast, needle monoterpenes greatly increased after G. clavigera inoculation and continued to increase during JPBW defoliation; however, JPBW increased its feeding rate to compensate for a change in host quality. Overall, monoterpene induction in jack pine depended on the agent(s) involved and their order. The systemic responses that were observed may have implications for MPB spread in the boreal forest. / Forest Biology and Managment

Thesis (M.S.)--University of Wyoming, 2008. / Title from PDF title page (viewed on June 26, 2009). Includes bibliographical references (p. 86-111).

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Finding alternative uses for small diameter raw materials is a critical problem throughout the United States. Insufficient markets for small diameter, southern yellow pine (Pinus spp.) trees from first plantation thinnings are impacting silvicultural practices on millions of acres of land. In western states, the lack of markets for small diameter ponderosa pine (Pinus ponderosa) and lodgepole pine (Pinus contorta) creates multiple problems in terms of excess material in the forest. This excess material enhances fire potential and reduces land management practices. This research deals with a new structural composite from small diameter raw logs using a technology called steampressed scrim lumber (SPSL). Mechanical and physical properties were performed and evaluated for each species. This research was conducted to evaluate these properties and to determine the suitability for commercialization.

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