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Full-Text Articles in Life Sciences
Modeling Thinning In East Texas Loblolly And Slash Pine Plantations, Dean W. Coble
Modeling Thinning In East Texas Loblolly And Slash Pine Plantations, Dean W. Coble
Faculty Publications
A new thinning model was proposed for loblolly pine (Pinus taeda L.) and slash pine (P. elliottii Engelm.) plantations in east Texas. The new model follows the index of suppression methodology introduced by Pienaar (1979). It was implemented in a new whole stand growth model for loblolly and slash pine plantations in east Texas (Coble 2009). The new thinning model performed similarly to existing Pienaar-type models for east Texas and the Southeastern United States across a range of site quality. The predicted basal area development consistently approached the unthinned counterpart, which is consistent with results from other studies. The new …
Short-Term Carbon Partitioning Fertilizer Responses Vary Among Two Full-Sib Loblolly Pine Clones, Jeremy P. Stovall, John R. Seiler, Thomas R. Fox
Short-Term Carbon Partitioning Fertilizer Responses Vary Among Two Full-Sib Loblolly Pine Clones, Jeremy P. Stovall, John R. Seiler, Thomas R. Fox
Faculty Publications
We investigated the effects of fertilizer application on the partitioning of gross primary productivity (GPP) between contrasting full-sib clones of Pinus taeda (L.). Our objective was to determine if fertilizer growth responses resulted from similar short-term changes to partitioning. A modeling approach incorporating respiratory carbon (C) fluxes, soil CO2 efflux (FS), and biomass was applied to a factorial design with two clones, fertilizer and control treatments, and four sequential monthly harvests of seedlings planted in a greenhouse. Partitioning was integrated over 121 days to above, belowground, and total net primary production (ANPP + BNPP = NPP), total belowground C flux …
Self-Referencing Site Index Equations For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young Jin Lee
Self-Referencing Site Index Equations For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young Jin Lee
Faculty Publications
The Schnute growth function was used in this study to model site index for unmanaged or low-intensity managed loblolly pine (Pinus taeda, L.) and slash pine (Pinus elliottii, Engelm.) plantations in east Texas. The algebraic difference approach was used to derive an anamorphic base-age invariant site function that was fi t as a fi xed base-age anamorphic site function (base age = 25 years). The dataset was comprised of 1,135 and 502 serially correlated height-age observations of loblolly and slash pine, respectively, which were collected over a 20-year-period as a part of the East Texas Pine Plantation Research Project (ETPPRP). …
Split-Season Herbaceous Weed Control For Full-Season Seedling Performance, Jimmie L. Yeiser, Andrew W. Ezell
Split-Season Herbaceous Weed Control For Full-Season Seedling Performance, Jimmie L. Yeiser, Andrew W. Ezell
Faculty Publications
Results from four loblolly pine (Pinus taeda L.) sites, one in each of MS and TX in 2001 and again in 2002, are presented. Twelve herbicide treatments and an untreated check were tested. Herbicide treatments were applied early (mid- March), late (mid-May), both timings, or not at all to achieve, early- late-, full-season, or no weed control. When averaged across all four sites and compared to the early treatment, bare ground was less from April through July and April through November on late treated and untreated plots, respectively. Full-season weed control provided numerically more bare ground than other treatments. When …
Tip Moth Control And Loblolly Pine Growth In Intensive Pine Culture: Four Year Results, David Kulhavy, Jimmie L. Yeiser, L. Allen Smith
Tip Moth Control And Loblolly Pine Growth In Intensive Pine Culture: Four Year Results, David Kulhavy, Jimmie L. Yeiser, L. Allen Smith
Faculty Publications
Twenty-two treatments replicated four times were applied to planted loblolly pine, Pinus taeda L., on bedded industrial forest land in east Texas for measurement of growth impact of Nantucket pine tip moth (NPTM), Rhyacionia frustrana Comstock, and effects on pine growth over 2 years. Treatments were combinations of Velpar®, Oust®, Escort®, and Arsenal® herbicides; and diammonium phosphate (DAP) fertilizer with treatments in 2000, in 2001, or in both years. Ten of the treatments were treated with Mimic timed with pheromone traps to reduce NPTM infestations. NPTM was controlled with the Mimic, and there was a small but significant increase in …
Use Of A Generalized Sigmoid Growth Function To Predict Site Index For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young-Jin Lee
Use Of A Generalized Sigmoid Growth Function To Predict Site Index For Unmanaged Loblolly And Slash Pine Plantations In East Texas, Dean W. Coble, Young-Jin Lee
Faculty Publications
A generalized sigmoid growth function was used in this study to model site index (SI) for unmanaged or lowintensity managed loblolly pine (Pinus taeda, L.) and slash pine (Pinus elliottii, Engelm.) plantations in east Texas. Schnute's growth function was fit to 11 ,367 and 5,040 height-age observations of loblolly and slash pine, respectively. These data were collected over a 20-year period from unmanaged pine plantations located across the east Texas region as a part of the East Texas Pine Plantation Research Project (ETPPRP). The fit model was used to derive Sl equations (25-year index age). The Sl equations apply to …
Oustar: A Premixed Blend Of Velpar Df+Oust Xp For Herbaceous Weed Control And Enhanced Loblolly Pine Seedling Performance, Jimmie L. Yeiser, Andrew W. Ezell
Oustar: A Premixed Blend Of Velpar Df+Oust Xp For Herbaceous Weed Control And Enhanced Loblolly Pine Seedling Performance, Jimmie L. Yeiser, Andrew W. Ezell
Faculty Publications
Six tests were established comparing the herbaceous weed control (HWC) and resultant loblolly pine (Pinus taeda L.) seedling performance from treatments of Oustar (0, 10, 13, 16, 19 ounces product acre-1), and industry standards (Velpar L+Oust 32+2; Arsenal+Oust 4+2 both in ounces product acre-1). Sites were prepared prior to planting with: burn only, chemical only, mechanical only, or mechanical and chemical methods. Oustar (13 ounces) and industry standards provided similar weed control and seedling performance. The low rate (10 ounces) of Oustar applied to sandy loam soils receiving chemical preparation and plowing prior to planting provided bareground comparable to industry …
Weed Control And Seedling Performance Using Oust, Velpar, And Velpar+Oust Impregnated Diammonium Phosphate, Jimmie L. Yeiser
Weed Control And Seedling Performance Using Oust, Velpar, And Velpar+Oust Impregnated Diammonium Phosphate, Jimmie L. Yeiser
Faculty Publications
Technology that combines herbicide and fertilizer into one treatment thereby reducing application costs while enhancing growth is needed. Four clean and well-prepared sites in TX, MS, and AL were tested. Study objectives were to evaluate the effectiveness of diammonium phosphate (DAP) impregnated with Oust, Velpar, or Velpar+Oust for herbaceous weed control and newly planted loblolly pine (Pinus taeda L.) seedling growth. In 1999, treatments were applied early post weed-emergence to 60percent bare ground in East TX. Impregnated DAP provided about 38percent less competitor control than separate liquid and fertilizer applications at similar rates. Best seedling survival and growth resulted from …
Influence Of Planting Density On Diameter And Height In East Texas Pine Plantations, Young Jin Lee, J. David Lenhart
Influence Of Planting Density On Diameter And Height In East Texas Pine Plantations, Young Jin Lee, J. David Lenhart
Faculty Publications
The response of diameter and height of unthinned planted stands ofloblolly (Pinus taeda L.) and slash (Pinus elliottii Eng elm.)pine in East Texas to different classes of planting densities were analyzed. After tracking the development ofdiameterand heightfor 15yron a setofpennanentplots representing a broad range of plantation parameters, average diameter and average height trends were observed. For both species, average diameter values were significantly larger with lower planting densities. 1n contrast, average height growth is insensitive to planting density at younger age classes for loblolly and at older age classes for slash pine plantations.
Estimating Crown Height For Unthinned Planted Pines In East Texas, Young Jin Lee, J. David Lenhart
Estimating Crown Height For Unthinned Planted Pines In East Texas, Young Jin Lee, J. David Lenhart
Faculty Publications
Stand-level models were derived to predict crown height or the distance from ground to the first live branch of unthinned planted loblolly (Pinus taeda L.) and slash (Pinus elliottii Eng elm.) pine trees in East Texas. Average height of the tallest trees was the principal predictor in the models. In addition, the influence of number of planted trees per acre, nonplanted basal area and fusiform rust (Cronartium quercuum [Berk.] Miyabe ex Shirai f.sp. fusiforme ) was considered. The models quantify the plantation ages when the butt log and successive lower stem logs are clear of live branches. This information may …
Survival And Growth Response Of Mesic And Dry-Site Sources Of Loblolly Pine Seedlings To Cyclic Soil Moisture Deficit, K. K. Abdollahi, M. V. Bilan, Z. H. Ning
Survival And Growth Response Of Mesic And Dry-Site Sources Of Loblolly Pine Seedlings To Cyclic Soil Moisture Deficit, K. K. Abdollahi, M. V. Bilan, Z. H. Ning
Faculty Publications
A growth chamber study compared height, biomass, and mortality rate of 4 to 12 old pine L.) seedlings of mesic and dry-site seed sources to 7 cyclic soil moisture stress levels, averaging between -0.3 to -2.4 Soil moisture stress was monitored gravimetrically throughout each dry-down cycle until a predetermined soil moisture potential was reached; soil was then rewatered. Shoot height was measured at two-month interval, from 4 to 12 months after the emergence of the seedlings. The oven dry weight of the seedlings and their roots were used for biomass determination. Mortality was recorded every 2 months throughout the experiment. …