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Showing 1 to 20 of 186 for “"basal area"”.
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Models of stand basal area distributions, individual tree basal area growth, and height-diameter relationships for loblolly pine
… with developing methodologies for predicting basal area distributions and individual tree basal areas. Data for the study was from the Hill Farm Experiment Station at Homer, Louisiana. Five height-diameter (basal area) curves were examined to determine which was most appropriate for the data …
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Additive basal area in Knysna Forest - myth or reality?
This paper explores the additive basal area phenomenon wherein the basal area of large above-canopy trees in a plot appears additive or extra to the total basal area of the plot. The mean basal area of Podocarpus falcatus and Podocarpus latifolius in 0.04 ha plots were studied in 2032 plots at …
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Basal Area Growth and Crown Dynamics in a Loblolly Pine Spacing Trial
Relationships between the culmination of basal area growth and degree of crown closure in loblolly pine (Pinus taeda L.) were investigated. A spacing trial established on the low Appalachian Piedmont and Atlantic Coastal Plain provided the data for the investigation. Test plots were planted at …
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Diameter/basal area increment equations for loblolly pine trees in cutover, site-prepared plantations
… objective of this study was to develop diameter/basal area increment equations for loblolly pine trees in thinned and unthinned plantations on cutover, site-prepared areas. Results indicated that one set of coefficients was sufficient to estimate individual tree growth (for the three year period …
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Dimensionally Compatible System of Equations for Tree and Stand Volume, Basal Area, and Growth
… compatible system of equations for stand basal area, volume, and basal area and volume growth was derived using dimensional analysis. These equations are analytically and numerically consistent with dimensionally compatible individual tree volume and taper equations and share parameters …
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Factors influencing basal area growth of yellow-poplar ( Liriodendron tulipifera L.) in central West Virginia
… forest inventory (CFI) plots to evaluate basal area growth of yellow-poplar (Liriodendron tulipifera L.) as related to four topographic factors (aspect, slope position, steepness, and landform), two competition variables (basal area per acre and trees per acre) and four tree …
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The use of airborne laser altimetry to estimate tropical forest basal area, volume, and biomass
… profiling is used to estimate tropical forest basal area, volume, and biomass. A procedure is developed and tested to divorce the laser and ground data collection efforts. The procedure involves 1) the collection of airborne laser data over the area of interest; 2) the collection of ground data …
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Modeling the impact of gypsy moth defoliation in individual tree mortality and basal area growth of northern hardwoods of central Pennsylvania
… variables used for prediction included stand basal area and an individual-tree relative basal area index. Success ranged from no fit for three of the species to an R value (a derivation of Akaike's information criterion) of .613 for white oak. The inclusion of defoliation in the models had a …
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CONSEQUENCES OF ALTERED BURN REGIMES ON PLANT COMMUNITY DIVERSITY IN THE PINEYWOODS OF EAST TEXAS
… factors. Fuel load, litter depth, hardwood basal area, softwood basal area, total basal area, and canopy cover were recorded. Understory species occurrence was recorded to genus level and separated into grass, forb, and woody growth form groups.</p> <p>Our results indicated that grass and …
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A growth and yield prediction model for thinned stands of yellow- poplar
… by Beck and Della-Bianca (1972) for predicting basal area growth and cubic-foot volume growth and yield in yellow-poplar stands after a single thinning indicated that a separate set of coefficients was required for stands thinned twice. A joint loss function involving both volume and basal area …
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Relationships between tree crown, stem and stand characteristics in loblolly pine plantations
… of crown diameter (CD) and crown projection area (CPA), and stand level measurement of the sum of crown projection areas (SCPA) were particularly important in contributing to high levels of model fit and prediction abilities of common stem and stand characteristics. As these crown measures …
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Forest recovery trends following an unprecedented mountain pine beetle outbreak in the southern Rocky Mountains
… outbreak and had all experienced at least 10% basal area mortality. I verified the forest type groups through multi-response permutation procedures and characterized them through indicator species analysis. I used a random forest analysis to determine how a suite of abiotic and biotic variables …
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The relationship between stem-form, stand-closure and site -conditions : the influence of environmental conditions on tree allometry and forest structure in west-central Alberta
… stand-closure variables, crown closure, total basal area, total volume and total number of stems were reduced to total basal area and total number of stems utilizing a bivariate correlation matrix by species. Site-conditions were subdivided into macro, meso and micro variables and reduced in …
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Response of uneven-aged in interior Douglas-fir stands to precommercial thinning in central interior, British Columbia
… components of the operable forest land in these areas, with easy access from main roads and towns. This study focused on the growth of uneven-aged Douglas-fir stands after pre-commercial thinning (spacing), with an impetus to improve upon current management practices. Data were collected from 24 …
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Modeling winter habitat for white-tailed deer in southwestern Virginia
… estimate relative deer densities on eleven study areas on the Jefferson National Forest, southwestern Virginia. Habitat data were collected on the same transects in July-September, 1985. Additional habitat information was measured from aerial photographs and USDA Forest Service compartment maps. …
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Selecting expansion factor and number of sampling positions for point and plot sampling
… developed to estimate the variances of total basal area per acre and total volume per acre for both point and plot samples. These variance approximations reflect the role that stand characteristics and expansion factor play in either sampling procedure. Validation of the estimated variances …
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Impacts of oak-focused silvicultural treatments on the regeneration layer nine years post-treatment in the southern Appalachian Mountains of North Carolina
… treatments were: a shelterwood treatment (25-30% basal area reduction through mid-story removal with herbicides), a prescribed fire treatment (two late dormant season fires occurred over a 9-year period), a shelterwood and burn treatment (prescribed fire 3-5 years following 30-40% basal area …
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Spatiotemporal Factors Affecting the Occupancy and Phenology of a Declining Songbird (Bachman's Sparrow - Peucaea aestivalis) at the Western Extent of its Range
… herbaceous ground cover and decreasing basal area, distance to the nearest source population, and basal area when canopy height is high. Singing phenology is affected by photoperiod and precipitation, with singing occurring between January and October. These results highlight the optimal …
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Growth of advanced European beech trees in the transformation phase in the southern Black Forest
… covered the three main tree growth attributes; basal area, height and crown width, and their importance to gap closure simulation. <br> <br>Although some of the specifics of the analyses are lost when generalizations are made, taken all together, the results suggest the following broad …
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Vegetation Responses to Prescribed Burning in a Mixed-conifer Woodland, Cuyamaca Rancho State Park, California
… were measured for tree and shrub density and basal area 6 months, 1% years, and 2 years following burning for the 3 sites respectively. Each burn site measured was compared against equivalent unburned control plots to help assess the effects of the burning. Density of saplings, seedlings, and …
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