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Showing 1 to 20 of 91 for “"Pinus taeda L."”.
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Modeling Green Weight of Loblolly Pine (Pinus taeda L.)
Green weight and green weight per unit volume relationships for loblolly pine trees have not been studied extensively and models for predicting weights across broad geographic areas are not readily available. In this regard three basic interrelated issues were addressed in this study: 1) an …
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GENETIC EFFICIENCY IN TWO LOBLOLLY PINE (PINUS TAEDA L) SEED ORCHARDS
<p>The degree to which seed crops in seed orchards reflect the genetic variability and superiority present among orchard parents (genetic efficiency) was examined in two loblolly pine seed orchards using seven allozyme loci as genetic markers.</p><p>The frequency of outcrossed progeny in the seed …
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Dominance/Suppression Competitive Relationships in Loblolly Pine (Pinus taeda L.) Plantations
… long-term field studies with loblolly pine (Pinus taeda L.) plantations were used to examine inequality (Gini coefficient) trends in diameter and the relationship between diameter relative growth rate (r) and initial size. Analysis with two spacing studies shows inequality increases with …
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Modelos biométricos inovadores para integrar o manejo florestal de Pinus taeda L.
Resumo: O Pinus taeda L. é a principal espécie das florestas plantadas no Meio-Oeste de Santa Catarina, constituindo-se em 70% do total da área e representa, junto com a agroindústria, os principais negócios do estado. O manejo florestal contribui para que estas florestas sejam conduzidas de forma …
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Modeling maximum size-density relationships of loblolly pine (Pinus taeda L.) plantations
Self-thinning quantifies the reduction in tree numbers due to density-dependent mortality. Maximum size-density relationships (MSDRs) are a component of self-thinning that describe the maximum tree density per unit area obtainable for a given average tree size, often quadratic mean diameter (D). An …
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Diagnosis of Loblolly Pine (Pinus taeda L.) Nutrient Deficiencies by Foliar Methods
Quick identification of loblolly pine nutrient deficiencies has troubled foresters who wish to increase productivity through fertilization. In the past, extensive field trials were established that did not allow for quick identification of a large number of possibly limiting nutrients in individual …
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Effects of Excessive Soil Phosphorus Accumulation on Loblolly Pine (Pinus taeda L.) Seedlings
… of these pastures to loblolly pine (<em>Pinus taeda</em> L.) plantations is often problematic, with poor seedling survival and abnormal tree growth. This study was conducted to assess the effects of excessive soil phosphorus on loblolly pine seedlings. An outdoor pot study was conducted …
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Stand dynamics, growth, and yield of genetically enhanced loblolly pine (Pinus taeda L.)
Genetic improvement has been an integral part of loblolly pine plantation forestry in southern United States for about 60 years with focus on improving timber yield, wood quality, and pest and disease resistance. Advances in techniques of genetic selection, breeding, and propagation of planting …
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Precision Forestry: Using LiDAR to Optimize Row Thinning in Pinus taeda (L.) Plantations
… LiDAR to assess individual-tree stem volumes in Pinus taeda L. plantations in the southeast US. Currently, starting rows in commercial row thinning operations are arbitrarily selected, but the study used LiDAR collected stem volume data to inform starting row selection. Three study sites were …
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Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
Loblolly pine (Pinus taeda L.) occupies 13 million hectares in the United States and represents a critical component of the global carbon (C) cycle. Forest management alters C dynamics, affecting the C sequestration capacity of a site. Identifying drivers that influence C cycling, quantifying C …
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Effects of Excessive Soil Phosphorus on Pinus taeda L. Nutrient Uptake, Survival, and Growth
… the successful establishment of loblolly pine (Pinus taeda L.) plantations, with high mortality of seedlings and atypical tree form. These fields often acquired high P soil concentrations as a result of decades of poultry litter applications. While excessive P has been recognized in horticulture …
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Dynamic modeling of branches and knot formation in loblolly pine (Pinus taeda L.) trees
… and self-pruning of branches in loblolly pine (Pinus taeda L.) trees was developed. A data set was obtained from a destructive sampling of whorl sections from 34 trees growing under different initial spacing. Data from dissected branches were used to develop a model for representing knot shape, …
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Modelling inter- and intra-specific competition effects in loblolly pine (Pinus taeda L.) plantations
… available stand simulators for loblolly pine (<i>Pinus taeda</i> L.) plantations. Competition was found to affect the distribution parameters such as coefficient of variation, skewness, and the general shapes of distributions for diameter measurements, total height, crown width and crown height. …
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Uso do biocarvão na produção de mudas e no crescimento inicial de Pinus taeda L.
… cuja prática de adubação não é comum, como Pinus taeda. Procurando por respostas sobre a influência do biocarvão na qualidade do solo e crescimento de P. taeda, foi realizada uma revisão de literatura dos principais trabalhos publicados sobre o biocarvão; bem como experimentos em campo e …
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Needleless shoots and loss of apical dominance in greenhouse-grown loblolly pine (Pinus taeda L.)
Loblolly pine that is winter-sown in the greenhouse and spring-outplanted has been observed to exhibit growth abnormalities in the form of multiple apical and needleless shoots. Seedlings that exhibit growth abnormalities are of questionable value in the evaluation of progeny tests. The use growth …
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Diameter Distributions of Juvenile Stands of Loblolly Pine (Pinus taeda L.) with Different Planting Densities
Diameter distributions of juvenile loblolly pine (Pinus taeda L.) with different planting densities were characterized utilizing a two-parameter Weibull distribution. Trend analysis was employed to describe the effects of planting density, age, relative spacing, and rectangularity on the estimated …
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Strength Properties of Juvenile and Mature Wood of Twelve Families of Loblolly Pine (Pinus Taeda L.)
<p>The wood mechanical properties of progeny from twelve open-pollinated parent trees were examined. Six families were from parents which had high wood specific gravity and six were from parents which had low wood specific gravity. Thirty-two-year-old trees, that had been planted at Many, …
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Physiological and growth responses to thinning in eight-year-old loblolly pine (Pinus taeda L.) stands
The influence of thinning at age eight on the photosynthetic rate, needle conductance, xylem water potential, water use efficiency and growth of loblolly pine trees was studied during their ninth and tenth growing seasons. Litterfall dynamics were monitored throughout the study period as well. At …
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Relationships between loblolly pine (Pinus taeda L.) yield and woody plant diversity in Virginia Piedmont plantations
… of competition control on loblolly pine (<i>Pinus taeda</i> L.), woody plant diversity, and wildlife habitat quality in Virginia Piedmont plantations 12-14 and 24-27 years of age. The responses of loblolly pine and competing woody vegetation in plantations 12-14 years of age were analyzed at …
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Soil Respiration and Decomposition Dynamics of Loblolly Pine (Pinus taeda L.) Plantations in the Virginia Piedmont
… respiratory fluxes in managed loblolly pine (Pinus taeda L.) plantations of the southeastern U.S. To achieve this overall objective, three studies were implemented to: 1) estimate the proportion and seasonality of RH:RS in four stand age classes, and identify relationships between RH:RS and …
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