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.

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.

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 Regional variations in the structure of the crust in the central United States from P-wave spectra

1973 ◽  
Vol 63 (5) ◽  
pp. 1663-1687
Author(s):  
Tuneto Kurita
Keyword(s):  
United States ◽  
Gulf Of Mexico ◽  
Crustal Structure ◽  
Coastal Plain ◽  
Lower Crust ◽  
P Wave ◽  
Ratio Method ◽  
Gulf Coastal Plain ◽  
Regional Variations ◽  
Central United States

abstract Regional variations in the crustal structure in the central United States have been inferred by the transfer ratio method from an analysis of long-period P waves recorded at SHA, OXF, FLO and MDS, the stations nearly along 89°W longitude. The crustal structure in this region is approximated by a stack of horizontal parallel layers except possibly in the area around FLO, where the structure is rather complicated. The crustal thickness is predominantly controlled by the thick silicic upper crust, whereas the mafic lower crust is about 10 km thick throughout this region. The P-wave velocity of the lower crust is about 6.9 to 7.0 km/sec except probably in the area around FLO, where 7.4 km/sec velocity is more likely. A sedimentary layer with a velocity of about 3.0 km/sec, having a thickness of about 3 km near the coast of the Gulf of Mexico, tapers out to the north within the Gulf Coastal Plain. Deep discontinuities in the crust may be replaced by transitional layers up to 10 km thick. The Moho is about 33 km deep near the coast of the Gulf of Mexico, deepens to about 41 km near an intersection of the Gulf coastal plain and the interior plain, reaches about 47 km or more in the midst of the interior plain, and rises to about 41 km toward an intersection of the interior plain and the superior upland. As for the midst of the interior plain, however, the depth of the Moho reduces by as much as 5 km, if the velocity in the lower crust is about 7.0 km/sec instead of about 7.4 km/sec. In any case, the general trend of the depth of the Moho may match with the topographic feature from the Gulf of Mexico to Lake Superior.

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.

I.—Notes on the Semi-Arid Conditions in a Part of Southern Texas

1913 ◽  
Vol 10 (11) ◽  
pp. 481-485
Author(s):  
T. O. Bosworth
Keyword(s):  
Gulf Of Mexico ◽  
Coastal Plain ◽  
San Antonio ◽  
Gulf Coastal Plain ◽  
West Texas ◽  
Arid Conditions ◽  
South West ◽  
Semi Arid

Introduction.—The conditions described below were observed over a large part of South-West Texas; but the local details apply to an area of one or two hundred square miles in McMullen County, geologically surveyed by the writer in 1912. The centre of observations was a little mining ranch named Crowther, about 50 miles south of San Antonio and 80 miles from the Gulf of Mexico, near the inland limit of the Gulf coastal plain. The country for many miles around Crowther is practically untouched by man, though a somewhat primitive little local railroad now under reconstruction reaches to within 16 miles of it.

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.

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