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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 20 of 34 for “"stem density"”.
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Effects of topping, stem density, and stage of vine cutting on canopy growth and tuber yield yield of potato (Solanum tuberosum L.)
… strong apical dominance, resulting in low stem density after planting. After emergence, the terminal buds reimpose apical dominance on the rest of the canopy leading to production of few secondary branches. Therefore, several experiments were conducted at the Virginia Polytechnic Institute …
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Quantifying genotypic and environmental factors affecting potato canopy growth
… of planting date, nitrogen rate, cultivar and stem density were examined in two multi-year experiments. Planting date had a strong effect on early growth, though subsequent growth was less sensitive to temperature. Leaf production and canopy duration varied with cultivar determinacy. Cultivar …
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Effects of Mid-Rotation Release on Forest Structure, Wildlife Habitat, and Pine Yield
… the control. Reductions in hardwood basal area, stem density, and shrub stratum cover were observed for both forms of release. Reductions in shrub stratum richness and diversity were also documented for imazapyr release; however, trends indicate that richness and diversity, as well as stem …
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Estimating forest attributes using laser scanning data and dual-band, single-pass interferometric aperture radar to improve forest management
… leaf area index (LAI) (Chapter 2), as well as stem density and height to live crown (Chapter 3) can be estimated accurately in intensively managed pine plantations using small-footprint, multiple-return airborne laser scanner (lidar) data, and (2) ascertain whether leaf area index in temperate …
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Water Column Ammonium Concentration and Salinity Influence Nitrogen Uptake and Growth of Spartina Alterniflora
… tidal simulation did not affect plant height, stem density, or above and belowground biomass. After 48 hours the highest water column NH<sub>4</sub><sup>+ </sup>uptake occurred at the lowest salinity (20 psu) and highest ammonium concentrations (100 µM) tested. After 6 months of …
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Effects of Silvicultural Management on Coast Redwood Forest Composition, Density and Structure in Santa Cruz and San Mateo Counties
… area (sample area = 1189 acres). Data from the systematic sample of 233 one-quarter acre nested cluster plots (sample intensity = 4.9%) rendered overall forest descriptions in terms of species composition, density, and structure. The common forestry measures of trees per acre (TPA), basal area per …
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Development, implementation, and economic evaluation of an integrated pest management program for alfalfa in Virginia
… presented to predict yield loss and changes in stem density as a function of weevil intensity. A sequential sampling plan was developed and validated for use in pest management decision making. Validation of the plan indicated an average error rate of 1.8%, with the number of samples needed …
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Field and laboratory observations of small-scale dispersion in wetlands
… by trapping in the vortex structure behind stems (hold-up dispersion), velocity deficits well downstream of stems (stem-wake dispersion), or transverse gradients in longitudinal velocity (shear dispersion). To better understand the relative magnitude of these various dispersive processes, …
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A field investigation of diffusion within a submerged plant canopy
… Among the most biologically active ecosystems on Earth, natural and man-made wetlands are important interceptors of pollutants and nutrients bound for the coastal ocean. The transport, dilution, and deposition processes occurring within the marsh are key factors in determining this …
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The Development Of Old-Growth Structural Characteristics In Second-Growth Forests Of The Cumberland Plateau, Kentucky, U.s.a.
… basal area and met some proposed thresholds for stem density. Neither age of forest met suggested minimum densities for old-growth for snags > 30 cm DBH, though old forest had almost three times that of young forest, and nearly approached values reported for old-growth forest. Young and old …
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Assessing the effects of field plot size and stand structure on forest inventory estimates derived from laser altimetry data
… Montana forest using five sizes derived from stem-mapped field data and multiple regression modeling techniques. Models were fitted for maximum and mean heights, stand basal area, stem density, and quadratic mean diameter. A validation routine was performed using an independent dataset and …
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Assessing the effects of field plot size and stand structure on forest inventory estimates derived from laser altimetry data
… Montana forest using five sizes derived from stem-mapped field data and multiple regression modeling techniques. Models were fitted for maximum and mean heights, stand basal area, stem density, and quadratic mean diameter. A validation routine was performed using an independent dataset and …
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Effects of Clearcutting with Whole Tree Harvesting on Woody and Herbaceous Plant Diversity After 17-Years of Regrowth in a Southern Appalachian Forest
… value (average of relative basal area and stem density) of 2 out of 25 woody species in the shrub stratum; and 1 out of 21 woody species in the tree stratum. Within stands, the three lower quality, 17-year-old stands (SI50 = 12.2, 15.2, and 18.3 m) most resembled their pre-harvest …
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Factors Affecting the Regrowth of <i>Ilex glabra</i> in a Routinely Burned Longleaf Forest
… use of prescribed fire on <em>Ilex glabra</em> stems/m<sup>2</sup> and factors affecting the regrowth of <em>I. glabra</em> after a prescribed burn to gain beneficial knowledge for management purposes. Environmental factors and morphological parameters of <em>I. glabra</em> were sampled before …
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Long-term patterns of mortality and regeneration in near-natural woodland
… ha<sup>-1</sup>; (ii) a decline in stem density until understorey reinitiation/gap-phase regeneration occurred; (iii) an increase instratification, especially under lighter crowned trees and once reinitiation/regeneration occurred; (iv) a scarcity of canopy gaps until at least …
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Nutrient constraints on plant community production and organic matter accumulation of subtropical floating marshes
… in aboveground biomass, accompanied by decreased stem density, and decreased species richness. Compared to other species, the grass, maidencane (Panicum hemitomon) responded most positively to increased nutrient availability at both sites, while at one site goldenrod (Solidago sempervirens) …
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Native Forb Establishment in Tall Fescue-dominated Cattle Pastures
… experiment, we observed a mean target plant density of 0.12 target plants per m2 (SD = 0.247) The greatest target plant stem density (P < 0.0001) and species richness (P < 0.001) was in plots treated with a 2% glyphosate solution and sown with native seeds in early summer with the next five …
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The Influence of Forest Structure on Sumatran Orangutan Nesting and Densities in the Lowland Dipterocarp Forests of North Sumatra
… with forest recovery such as higher canopy density, fewer gaps, increased rugosity and higher stem density. Nest densities were also associated with reduced distance to the edge of the forest, further research is needed to determine whether this is due to orangutans utilising neighbouring …
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Spartina Alterniflora Productivity and Salt Marsh Stability Relative to Marsh Platform Elevation
… in mean sea level. Aboveground biomass, stem density, stem height and percent organic nitrogen were measured as a function of relative elevation. Marsh surface elevations were extracted from LIDAR data collected in 2003. An optimal elevation for <em>Spartina</em> standing biomass was …
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Quantifying the Diversity of Agronomic Traits of Cicer Milkvetch (Astragalus cicer L.) Germplasm Collections Using UAV-Based Imagery
… included the agro-morphological traits maximum stem length, leaf number per stem, stem density, rhizome spread and plant area scores, and the UAV-based traits NDVI green area and NDVI canopy volume. The first forage harvest occurred in late June and the stockpile harvest in mid-October. …
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