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 16 of 16 for “"competing vegetation"”.
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Destination of Isotopic Nitrogen Fertilizer Under Varying Herbicide Regimes in a Mid-Rotation Loblolly Pine (Pinus taeda L.) Plantation in the Piedmont of Virginia, USA
Mid-rotation fertilization and vegetation control are some of the most common silvicultural treatments in loblolly pine (Pinus taeda L.) plantations in the southeastern United States. Competing vegetation is commonly thought to sequester fertilizer nitrogen (N) and reduce the potential growth …
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Modeling General Response to Silvicultural Treatments in Loblolly Pine Stands
… of thinning, fertilization, and control of competing vegetation. Chapman-Richards functions were used to model the base-line growth. Separate response functions to mid-rotation thinning and fertilization effects were developed. The thinning response function was based on duration and rate …
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Effects of Site Preparation on Survival and Growth of Planted Loblolly Pine
… characteristics, and density and height of competing (non-pine) woody stems. Three replications of four site preparation treatments (control, burn, chop, KG blade) resulted in the KG bladed plots having the highest survival, height, and diameter, but the lowest nutrient levels while, also, …
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Factors affecting loblolly pine growth following site preparation
… different site preparation prescriptions on competing vegetation, tree nutrition, and the spatial distribution of planted seedlings was examined. Three treatments had a soil tillage component and differed with respect to the number of operations employed in removing residual trees and logging …
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An Assessment on the Cultivation of Black Cottonwood Cuttings in Nootka Lupine Fields in Conjunction with Site Preparation
… the cottonwood plants with early relief from competing vegetation. Clone differences were found in plant growth, but these were site specific, most likely due to climatic differences between sites. However, the clones displayed no interaction with the site preparation methods. The results …
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Development and evaluation of trapping studies for Hylobius pales (Herbst) and Pissodes nemorensis Germar (Coleoptera: curculionidae) in Virginia Christmas tree plantations
… observed between stationary and rotated traps. Vegetation management had no effect on trap catch. However, it was observed that newly planted white pine seedlings (Pinus strobus L.) were fed upon by H. pales at Significantly higher rates in plots not managed for competing vegetation than in …
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Effects of paper mill sludge on tree growth and competition in young red pine plantations
… treatments, respectively. An assessment of woody vegetation using a competing vegetation assessment system (CVAS) showed essentially no response by hardwood competition to sludge application for either study site. Total weed control, consisting of 0.140 kg ha⁻¹ a.i. of Oust™ and 1.3 kg ha⁻¹ a.i. …
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Loblolly Pine Growth and Competition Response to Varied Chemical Site Preparation Treatments 14 Years After Establishment in the Piedmont of Virginia
… methyl (SMAX) which targets herbaceous vegetation. Half of all treatments, including the check and release, received a year-one weed control treatment (H) of imazapyr and SMAX. Pines were measured every few years, including the latest measurement in year 14 (2019). Competing hardwood …
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Effects of understory vegetation manipulation on hardwood regeneration recruitment and growth in southern Appalachian forests
… of oak advance regeneration. Understory Vegetation Control was conducted in 1994 in average quality (SI₅₀ 17.7 - 21.9 m for upland oak) southern Appalachian forest stands to determine the effects on oak (<i>Quercus</i> spp.) and maple (<i>Acer</i> spp.) advance seedling abundance, growth, …
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Effects of Low-Input Vegetation Management on Pine-Hardwood Mixed Stands in the Northern Piedmont
… and soil spot release) were used to control competing vegetation during the study. The four even-aged regeneration treatments applied to loblolly pine and mixed hardwood stands of this study had a significant effect on their growth. Loblolly pine growth increased and mixed hardwood growth …
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Enhancement of Floral Species Richness in Glaciated Prairie Temporary Wetlands
… of desirable temporarily flooded wetland vegetation. To assess the effectiveness of these treatments on reed canarygrass (Phalaris arundinacea L.), 2 of the temporary wetlands selected had plant communities dominated by this undesirable colonizing species. Experimental treatments were a …
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Early Survival and Growth of Introduced Western Coast and Mexican Pine Species in East Texas
… soil moisture. Influences from understory vegetation and the ecological differences of the forest stand structure could have lessen chances for species establishment compared to their native ecosystem. Differences such as soils at the study sites compared to native range soils and the …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… to more moist Grand fir/Twinflower. Reducing competing understory vegetation significantly improved PAI for ponderosa pine trees in Low and Medium sites (p<0.001), and for Douglas-fir in Low sites (p<0.06). PAI in untreated control plots was 42% - 59% lower for PIPO and 23% - 34% lower for …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… to more moist Grand fir/Twinflower. Reducing competing understory vegetation significantly improved PAI for ponderosa pine trees in Low and Medium sites (p<0.001), and for Douglas-fir in Low sites (p<0.06). PAI in untreated control plots was 42% - 59% lower for PIPO and 23% - 34% lower for …
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Effects of Silvicultural Treatments and Soil Properties on the Establishment and Productivity of Trees Growing on Mine Soils in the Appalachian Coalfields
… mining removes native topsoils and any native vegetation that was support by these native soils. In the Appalachian coal-producing region of the United States, the pre-mining landscape is predominantly forested. Prior to the Surface Mining and Reclamation Act of 1977 (SMCRA), surface mined …
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Surfactant Formulations to Enhance Triclopyr Amine Efficacy: Effects on Adhesion, Retention and Contact Phytotoxicity On Three Hardwood Species
… when hardwoods remain in the pine canopy. Competing vegetation can be efficiently controlled by herbicides, which need to be formulated either in-can or in-tank to allow them to perform optimally. Adjuvants have proven essential to increasing the efficacy of herbicides, due to their ability …