Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Tree quality"”.
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Forest Composition, Regeneration, and Tree Quality in the Southern Appalachian Mountains of Virginia: Selective Cutting vs. Shelterwood
… The specific attributes compared were: (1) tree species composition; (2) seedling, sapling, and overstory tree density; (3) overstory tree quality and size; (4) sapling crown class; and (5) canopy closure. Seedlings, saplings, and overstory trees were sampled at 22 SC and 28 SW sites. …
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Applying the diagnosis and recommendation integrated system(DRIS) to Fraser fir Christmas trees
… fir [Abies fraseri (Pursh)Poir.] Christmas trees and prescribing fertilizers is not well understood. Agricultural researchers have established critical yield levels for agronomic crops that are objective measures of crop quality and have associated these yields with nutrient status; however, …
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Evaluating the nutritional status of Fraser fir [Abies fraseri (Pursh) Poir.] Christmas trees using foliar analysis and DRIS application
… studies were conducted with Fraser fir Christmas trees to determine the variation in foliar nitrogen (N) , phosphorus (P) , potassium (K), calcium (Ca), and magnesium (Mg) levels among plantation ages, sample locations within the crown, and effects due to seasonal changes. Extensive variation in …
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Using economic factors in managing Appalachian hardwoods for high quality
… many of them economic. Among these are species, tree size, tree quality, logging costs, and market alternatives. This study demonstrates how to incorporate these, using a new microcomputer program with growth projection, YIELD-MS (Hepp, 1986), to find an economically favorable regime for a …
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An Evaluation of Concepts and Tools for Managing the Northern Hardwoods
… and growth) as well as among individual trees (e.g. stem quality, value, and growth). This variation challenges the management of the northern hardwoods by reducing the predictability and consistency of the biological and economic performance of both stands and individual trees. To …
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Local Variation in the Chemical Defence of European Pine Sawfly (Neodiprion sertifer): Effects of Host Tree Chemistry and Social Environment
… I also studied the effect of host plant quality, specifically the monoterpene concentration of pine needles, on the chemical defence and defensive behaviour of N. sertifer larvae and female oviposition decisions (group size and sex allocation). Additionally, I analysed how the social …