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.
Results
Showing 1 to 20 of 89 for “"pine plantations"”.
-
Modeling Mortality of Loblolly Pine Plantations
… mortality models were developed for loblolly pine plantations throughout its geographic range in the United States. The model for predicting stand mortality were developed using stand characteristics and biophysical variables. The models were constructed using two modeling approaches. In the …
-
Modeling growth dynamics of juvenile loblolly pine plantations
Modeling growth dynamics of juvenile loblolly pine plantations can help to address important management decisions that have to be made in young stands. The present study addressed diameter and height prediction as well as crown development analysis as functions of independent variables such as site …
-
Characterizing spatiotemporal variation in LAI of Virginia Pine Plantations
Loblolly pine is an important managed tree species within the southeastern United States, and better understanding spatial patterns in its productivity has potential to contribute to both modeling and management of the species. Using recently-created pine management maps specific to Virginia and …
-
Economic guidelines for establishing loblolly pine plantations in Virginia
Economic guidelines for regenerating loblolly pine were developed for Virginia forest landowners. The general procedure used was the structured personal interview. The basic economic guidelines are expected regeneration costs calculated using the actual total regeneration cost and an associated …
-
The dynamics of litterfall in eucalypt woodland surrounding pine plantations
… and in particular, the invasive species radiata pine (Pinus radiata D. Don) is of considerable concern. Radiata pine has a very limited distribution in the northern hemisphere in its natural range. Its utility in the timber and manufacturing industries, however, has lead to widespread planting, …
-
Economics of Managing Loblolly Pine Plantations for Increased Wildlife Biodiversity
… and revenues gained from managing loblolly pine (<em>Pinus taeda</em>) plantations in East Texas for strictly timber production or a combination of timber production and wildlife biodiversity. Management regimes evaluated had varying planting densities, thinning frequency and intensities, …
-
Ecological Enhancement of Timber Growth: Applying Compost to Loblolly Pine Plantations
… the application of compost onto a small loblolly pine tree forest in northeast Texas. Its purpose was to determine if the application of various amounts of compost would provide for accelerated rates of growth for the trees. Soil parameters were also monitored. A total of 270 trees were planted …
-
Empirical diameter distributions and predicted yields of thinned loblolly pine plantations
… A growth and yield model for thinned loblolly pine plantations was developed based on data from 128 0.2-acre permanent plots in the Virginia Piedmont and Coastal Plain. The segmented cdf which characterized the diameter distribution of a stand was searched for such that the resulting total …
-
Compatible whole-stand and diameter distribution models for loblolly pine plantations
… the diameter distribution of unthinned plantations of loblolly pine from whole stand predictions of stand attributes. The beta probability density function (pdf) and the Weibull pdf were used as models for the diameter distribution function for estimating a stand attribute (such as …
-
Simulation of Early Stand Development in Intensively Managed Loblolly Pine Plantations
… and incorporated into the PTAEDA2 loblolly pine stand simulator to provide growth projections from time of planting. Annual height growth is predicted using a two-parameter Weibull function, where distribution parameters are estimated from equations that utilize site index and age as …
-
Growth Models and Mortality Functions for Unthinned and Thinned Loblolly Pine Plantations
… which was developed for use with loblolly pine (Pinus taeda) plantations established on cut-over, site prepared lands. Data from a long-term thinning study served as a basis for attempting to improve the predictive output of PTAEDA2. Assessment of differences in model parameter estimates …
-
A comparison of yield estimation techniques for old-field loblolly pine plantations
Efficient management of loblolly pine (Pinus taeda) plantations requires accurate estimation of stand yield at rotation. Methods of estimating yield from stand variables, existing number of trees per acre, height of the dominant and co-dominant stand, and stand age, are presented. These methods …
-
Relationships between tree crown, stem and stand characteristics in loblolly pine plantations
… unthinned and thinned stands of planted loblolly pine were investigated. The individual tree crown measurements 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 …
-
Predicting height to live crown increment for thinned and unthinned loblolly pine plantations
… annual crown height increment in loblolly pine plantations. The selected model contained tree height (HT), tree crown ratio (CR) raised to the one-half power, age (A), and a competition index (CI) for the distance-dependent model and the ratio of quadratic mean diameter to tree dbh (DR) for …
-
Nitrogen dynamics after site preparation in three loblolly pine plantations on the Virginia Piedmont
… upon N distribution and availability in loblolly pine (Pinus taeda L.) plantations in Virginia. In the summer of 1982, three forest sites at the Reynolds Homestead Research Center on the Virginia Piedmont were clearcut. In the fall of the same year all three sites were prepared for planting using …
-
Intercropping for food, fiber, and fuel on pine plantations in Virginia and North Carolina
… The advantages of applying this concept on young pine plantations in the south can increase site utilization, reduce weed competition, provide annual or semi-annual revenues early in the timber rotation, ameliorate the soil, and diversify production. Research was initiated to determine the …
-
Impacts of Fertilization on Soil Properties in Loblolly Pine Plantations in the Southeastern United States
… on the O horizon and mineral soil in loblolly pine (Pinus taeda L.) plantations over a 12-year period. To accomplish this, we used 9 experimental sites located across the south, which were grouped using the CRIFF Classification System. Group 1—CRIFF A, B (poorly-drained Ultisols); group 2—CRIFF …
-
Economic comparisons of thinning from above and below in Loblolly Pine plantations using dynamic programming
Thinning from above and below were compared using an economic optimizing dynamic program, FORTE (Arthaud 1986). Economically optimal (net present value maximizing) thinning regime and rotation age were determined for benchmark economic and model inputs. Sensitivity of net present value and optimal …
-
Effects of paper mill sludge on tree growth and competition in young red pine plantations
… applied to a 4-year-old and a 6-year-old red pine (Pinus resinosa Ait.) plantation in central Wisconsin at rates of 10, 20 and 40 dry Mg ha⁻¹. Red pines measured 10 and 22 months following sludge application did not show a significant volume growth response to increasing sludge rates. …
Page 1 of 5