Establishment treatments affect the relationships among nutrition, productivity and competing vegetation of loblolly pine saplings on a Gulf Coastal Plain site

1998 ◽  
Vol 105 (1-3) ◽  
pp. 175-188 ◽  
Author(s):  
Mary A Sword ◽  
Allan E Tiarks ◽  
James D Haywood
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Gulf Coastal Plain ◽  
Competing Vegetation

Predicting Stand Attributes of Loblolly Pine in West Gulf Coastal Plain Using Gradient Boosting and Random Forests

2020 ◽  
Author(s):  
Xiongwei Lou ◽  
Yuhui Weng ◽  
Luming Fang ◽  
HL Gao ◽  
Jason Grogan ◽  
...  
Keyword(s):  
Loblolly Pine ◽  
Random Forests ◽  
Coastal Plain ◽  
Mean Squared Error ◽  
Pine Plantations ◽  
Machine Learning Techniques ◽  
Coefficient Of Determination ◽  
Gradient Boosting ◽  
Gulf Coastal Plain ◽  
Intensively Managed

Two machine-learning techniques, gradient boosting (GB) and random forests (RF), were used to predict stand mean height (HT), trees per hectare (Tree ha-1) and basal area per hectare (BA ha-1) based on datasets collected from extensively- and intensively-managed loblolly pine plantations in the West Gulf Coastal Plain region. Models were evaluated using coefficient of determination (R2), bias and root mean squared error (RMSE) by applying models to independent dataset and then compared to the model (Coble et al. 2017) currently being used in the region. For extensively-managed plantations, the GB models had less bias, larger R2 and smaller RMSE than RF and HT model was the best, followed by those of Tree ha-1 and BA ha-1. Even for BA ha-1, the GB model had R2 over 0.83. GB and RF models outperformed the Coble et al. (2017); differences were notable for HT and Tree ha-1, but significant for BA ha-1. For intensively-managed plantations, GB and RF were similarly great in predicting HT and Tree ha-1, but GB outperformed RF in predicting BA ha-1. We recommend the use of GB models to predict quantitative information required for managing loblolly pine plantations in the region.

Removal of Competing Vegetation from Established Loblolly Pine Plantations Increases Growth on Piedmont and Upper Coastal Plain Sites

1996 ◽  
Vol 20 (4) ◽  
pp. 188-193 ◽  
Author(s):  
James C. Fortson ◽  
Barry D. Shiver ◽  
Lois Shackelford
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Basal Area ◽  
Pine Plantations ◽  
Slope Position ◽  
Age Classes ◽  
Individual Tree ◽  
Competing Vegetation ◽  
Positive Treatment ◽  
The Individual

Abstract A series of paired plots was installed in loblolly pine plantations at 42 locations in Georgia's Piedmont and Alabama's Piedmont and Coastal Plain. One plot of each pair had all competing vegetation eliminated. The other plot was left as an uncontrolled check. Locations were stratified over two age classes (5-9 and 12-16 yr old) and three slope positions (top, midslope, and bottom). Analysis of 33 surviving locations 8 yr after treatment revealed a positive treatment effect for both individual tree (dbh and total height) and stand characteristics (basal area per acre, total volume per acre, and merchantable volume per acre). There was no difference in volume response between age classes. Slope position was not significant for the individual tree variables, but was significant for the stand variables, with midslopes responding most positively followed by bottom and then top slope positions. Over all locations, the average treatment response was approximately ½ cord/ac/yr. Economic analyses indicate that the magnitude of the response will be economical for many stumpage prices, particularly on midslope and bottom slope positions, in plantations where access and species composition make herbicide spraying possible. South J. Appl. For. 20(4):188-192.

Stand-Level Cubic-Foot Volume Ratio Equations for Planted Loblolly Pine on Site-Prepared Land in the Mid-South Gulf Coastal Plain

1988 ◽  
Vol 12 (1) ◽  
pp. 7-11
Author(s):  
Thomas G. Matney ◽  
Alfred D. Sullivan ◽  
Julia R. Ledbetter ◽  
Robert M. Farrar
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Volume Ratio ◽  
Pine Plantations ◽  
Gulf Coastal Plain ◽  
Predictor Equations

Abstract Volume ratio predictor equations are presented for calculating cubic foot volumes per acre to any top diameter limit in loblolly pine plantations on cutover site-prepared land. An illustrative example of the application of the equations is presented. South. J. Appl. For. 12(1):7-11.

scholarly journals Hudnall-Pirtle Site: An Early Caddoan Mound Complex in Northeast Texas

1991 ◽  
Author(s):  
James E. Burseth
Keyword(s):  
Gulf Of Mexico ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
Coniferous Forests ◽  
Faunal Remains ◽  
Gulf Coastal Plain ◽  
Alluvial Terrace ◽  
Hardwood Trees ◽  
Pine Trees ◽  
Sabine River

The Hudnall-Pirtle (41RK4) site is situated on a large T-1 alluvial terrace of the Sabine River in northern Rusk County of Texas. This part of Texas, comm.only referred to as Northeast Texas, is part of the Southern Gulf Coastal Plain, a relatively level, sloping plain formed by pre-Pleistocene embayments of the Gulf of Mexico. From a biogeographical perspective, the site is located in the Oak-Hickory-Pine Forest. This area represents the western extension of the Southern coniferous forests, and is dominated by shortleaf, longleaf, slash, and loblolly pine trees. In the floodplains of rivers and major creeks of Northeast Texas, the dominant vegetation is hardwood trees, including oak, hickory, elm, and gum. Soils consist of light colored to dark colored sands and sandy loams, with denser clays in the floodplains of major rivers and creek. The soils have been heavily leached by relatively high rainfall that ranges between 40 and 50 inches per year. Soils are generally acid, causing poor preservation of faunal remains in archeological deposits.

scholarly journals Archeological Investigations at the Hudnall-Pirtle Site (41RK4) An Early Caddo Mound Center in Northeast Texas

2006 ◽  
Author(s):  
James E. Bruseth ◽  
Timothy K. Perttula ◽  
Gayle J. Fritz ◽  
Bonnie C. Yates
Keyword(s):  
Gulf Of Mexico ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
The State ◽  
Coniferous Forests ◽  
Gulf Coastal Plain ◽  
Alluvial Terrace ◽  
Hardwood Trees ◽  
Pine Trees ◽  
Sabine River

The Hudnall-Pirtle site (41RK4) is situated on a large T-1 alluvial terrace of the Sabine River in northern Rusk County in Texas. This area of the state, commonly called Northeast Texas, is part of the Southern Gulf Coastal Plain, a relatively level, sloping plain formed by the pre-Pleistocene embayment of the Gulf of Mexico. From a biogeographical perspective, the site is located in the Oak-Hickory-Pine forest of eastern Texas, otherwise known as the Pineywoods. This area represents the western extension of the southern coniferous forests and is dominated by shortleaf and loblolly pine trees. Hardwood trees, including various oaks, hickory, elm, and gum, are the dominant vegetation in the floodplains of rivers and major creeks in Northeast Texas.

scholarly journals Three Methods for Low-cost Regeneration of Pine—Hardwood Stands in the Gulf Coastal Plain

2000 ◽  
Vol 24 (1) ◽  
pp. 37-44
Author(s):  
Robert H. Jones ◽  
Glenn R. Glover ◽  
James W. Kimbrell
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Opposite Effect ◽  
Low Cost ◽  
Gulf Coastal Plain ◽  
Soil Movement ◽  
Litter Cover ◽  
Loblolly Pines ◽  
Pinus Taeda L ◽  
Time Of Harvest

Abstract Seedtree, clearcut-and-plant, and fell-burn-and-plant methods were applied to three mature, mixed loblolly pine (Pinus taeda L.)-upland hardwood stands at the Dixon Forestry Education Center in southern Alabama. One to two years after treatment, all methods resulted in adequate stocking (> 100 trees/ac) of loblolly pine, laurel oak (Quercus hemisphaerica Batr. Ex Wild.) and other oak species. Clearcut-and-plant resulted in more laurel oaks than loblolly pines while fell-burn-and-plant had the opposite effect. Relatively high densities of both species occurred in the seed tree. In the first two years after harvest, fell-burn-and-plant had the lowest litter cover. All treatments had greater rates of surface soil movement than untreated controls. Six-to-seven years after methods were applied, loblolly pine and laurel oak maintained their dominance in all treatments, although loblolly pine had greater mean height and a greater proportion of stems in larger size classes. Density of oaks more than 4.5 feet tall 6 to 7 yr after harvest were predictable from pre-harvest surveys of total oak density. If adequate densities of pine seed and advance oak regeneration are in place at time of harvest, any of these low cost methods can provide successful regeneration of mixed pine-oak stands on Coastal Plain uplands. South. J. Appl. For. 24(1):37-44.

Effect of vegetative competition on the moisture and nutrient status of loblolly pine

1984 ◽  
Vol 14 (1) ◽  
pp. 1-9 ◽  
Author(s):  
G. A. Carter ◽  
J. H. Miller ◽  
D. E. Davis ◽  
R. M. Patterson
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Nutrient Status ◽  
Moisture Stress ◽  
Nutrient Concentrations ◽  
Pressure Potential ◽  
Competing Vegetation ◽  
Xylem Pressure Potential ◽  
Loblolly Pines ◽  
Calcium Magnesium

A field study examined the effects of competing vegetation on the moisture and nutrient status of 5-year-old loblolly pines (Pinustaeda L.). Similar experiments were conducted on a Piedmont site and a Coastal Plain site using individual pines as experimental units. Predawn measurements of xylem pressure potential were made using detached needle fascicles, and nutrient concentrations in soil and foliage samples were determined monthly. This study was conducted during the 3rd year of a relatively dry 3-year period. On the Piedmont site, elimination of all competing vegetation within 1.5 m of the pines significantly lowered moisture stress when compared with the no-elimination treatment; on the Coastal Plainee site, differences were significant on only half of the assay dates. Removing only arborescent vegetation on the Piedmont site reduced pine water stress one-half as much as removing all vegetation, but on the Coastal Plain site this reduction was about two-thirds of that found following removal of all vegetation. As drought length increased, stress increased, regardless of treatment. Higher levels of competing vegetation significantly reduced available potassium, calcium, magnesium, and manganese concentrations in the loamy sand of the Coastal Plain site, but only potassium was reduced on the Piedmont. None of the treatments significantly affected foliar nutrients at either site.

scholarly journals Response of Competing Vegetation to Site Preparation on West Gulf Coastal Plain Commercial Forest Land

1995 ◽  
Author(s):  
Gale L. Wolters ◽  
Henry A. Pearson ◽  
Ronald E. Thill ◽  
V. Clark Baldwin ◽  
Alton Martin
Keyword(s):  
Coastal Plain ◽  
Site Preparation ◽  
Forest Land ◽  
Gulf Coastal Plain ◽  
Competing Vegetation ◽  
Commercial Forest

Loblolly Pine Plantation Development is Influenced by Site Preparation and Soils in the West Gulf Coastal Plain

1989 ◽  
Vol 13 (1) ◽  
pp. 17-21 ◽  
Author(s):  
James D. Haywood ◽  
James D. Burton
Keyword(s):  
Loblolly Pine ◽  
Coastal Plain ◽  
Basal Area ◽  
Site Preparation ◽  
Additional Treatment ◽  
Phosphorus Fertilization ◽  
Gulf Coastal Plain ◽  
The West ◽  
Burn Treatment ◽  
Growing Seasons

Abstract Productivity of upland loblolly pine (Pinus taeda L.) plantations was studied under seven site preparation treatments and five soil classes, with and without fertilizer, in the West Gulf Coastal Plain. Generally, the chop-burn-harrow and shear-windrow-harrow treatments resulted in themost basal area (ave. 112 ft²/ac), but the chop-burn-harrow treatment produced the most fiber (2,109 ft³/ac) after 12 growing seasons. Harrowing as an additional treatment after chopping-and-burning increased productivity by 394 ft³/ac over the chop-burn treatment. The leastproductive treatments were underplant-inject and shear-windrow. Generally, basal area per acre was comparatively high on the silty, slowly permeable clay, and very slowly permeable clay soils (ave. 105 ft ²/ac). Two of the soils, silty and slowly permeable clay, had comparatively highvolume production (ave. 1,878 ft³/ac). The least productive sites had gravelly subsoils. Generally, phosphorus fertilization did not influence pine productivity. South. J. Appl. For. 13(1):17-21.

scholarly journals A New Site Index Model for Intensively Managed Loblolly Pine (Pinus taeda) Plantations in the West Gulf Coastal Plain

2019 ◽  
Author(s):  
Kynda R Trim ◽  
Dean W Coble ◽  
Yuhui Weng ◽  
Jeremy P Stovall ◽  
I-Kuai Hung
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
Site Index ◽  
The United States ◽  
Pine Plantations ◽  
Permanent Plots ◽  
Gulf Coastal Plain ◽  
The West ◽  
Intensively Managed

Abstract Site index (SI) estimation for loblolly pine (Pinus taeda L.) plantations is important for the successful management of this important commercial tree species in the West Gulf Coastal Plain of the United States. This study evaluated various SI models for intensively managed loblolly plantations in the West Gulf Coastal Plain using data collected from permanent plots installed in intensively managed loblolly pine plantations across east Texas and western Louisiana. Six commonly used SI models (Cieszewski GADA model, both Chapman-Richards ADA and GADA models, both Schumacher ADA and GADA models, and McDill-Amateis GADA model) were fit to the data and compared. The Chapman-Richards GADA model and the McDill-Amateis GADA model were similar and best in their fit statistics. These two models were further compared to the existing models (Diéguez-Aranda et al. 2006 (DA2006), Coble and Lee 2010 (CL2010)) commonly used in the region. Both the Chapman-Richards GADA and the McDill-Amateis GADA models consistently predicted greater heights up to age 25 than the models of DA2006 and CL2010, with larger height differences for the higher quality sites, but predicted shorter heights thereafter. Ultimately, the McDill-Amateis GADA model was chosen as the best model for its consistency in predicting reasonable heights extrapolated beyond the range of the data. Foresters can use this model to make more informed silvicultural prescriptions for intensively managed loblolly pine plantations in the West Gulf Coastal Plain.

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