scholarly journals Validation of the Unthinned Loblolly Pine Plantation Yield Model-USLYCOWG

1982 ◽  
Author(s):  
V. Clark Baldwin ◽  
D.P. Feduccia
Keyword(s):  
Loblolly Pine ◽  
Pine Plantation ◽  
Yield Model ◽  
Plantation Yield

Evaluation of a Loblolly Pine Plantation Thinning Model

1986 ◽  
Vol 10 (1) ◽  
pp. 52-63 ◽  
Author(s):  
W. D. Smith ◽  
W. L. Hafley
Keyword(s):  
Loblolly Pine ◽  
Total Yield ◽  
Average Diameter ◽  
Growth And Yield ◽  
Pine Plantation ◽  
Yield Model ◽  
Thinning Intensity ◽  
Stem Size ◽  
Accuracy Of Prediction ◽  
The Mathematical Model

Abstract Eight long-term thinning studies of loblolly pine in plantations, established across the range of loblolly pine, are summarized for purposes of evaluation of a thinning model. The studies have been classified according to questions they addressed, such as intensity of selective thinning, intensity of row thinning, row versus selective thinning, and accelerated saw-timber production. Based on these studies the following inferences are made: 1. With selective thinning, total yield decreases and final stem size increases as intensity is increased. As rotation length is increased, the loss in total yield associated with increased intensity is diminished. 2. Row thinning, without successive selective thinning, reduces total yield proportional to the intensity of thinning, has little effect on average diameter, but significantly increases the diameter of dominant trees. 3. Row thinning combined with moderate to heavy selective thinning results in responses little different than from selective thinning alone. 4. With heavy early thinning, yields of 15 + Mbf are attainable in a 30 year rotation. Since the studies were not used in the development of the mathematical model being evaluated, they represent an independent test of the model. Thinning simulations based on the loblolly pine plantation growth and yield. model are compared with the reported observations from the eight studies, the intent being to test the veracity of the model with respect to its accuracy of prediction and consistency with regard to the inferences suggested by the studies. The comparisons presented demonstrate that the model performs well with regard to both accuracy and consistency. Recognizing that the studies were, in general, established under conditions much different than occur today, use of the model to expand the applicability of the inferences implied from the studies to current conditions is demonstrated.

scholarly journals Dual-Cropping Loblolly Pine for Biomass Energy and Conventional Wood Products

2008 ◽  
Vol 32 (1) ◽  
pp. 33-37 ◽  
Author(s):  
D. Andrew Scott ◽  
Allan Tiarks
Keyword(s):  
Loblolly Pine ◽  
Small Diameter ◽  
Cropping System ◽  
N Fertilization ◽  
Wood Products ◽  
Biomass Energy ◽  
Pine Plantation ◽  
Southern Pine ◽  
Small Diameter Trees ◽  
Viable Method

Abstract Southern pine stands have the potential to provide significant feedstocks for the growing biomass energy and biofuel markets. Although initial feedstocks likely will come from low-value small-diameter trees, understory vegetation, and slash, a sustainable and continuous supply of biomass is necessary to support and grow a wood bioenergy market. As long as solidwood products are more valuable, bioenergy production will not be the primary market for southern pine. A study exploring a dual-cropping system for southern pine bioenergy and solidwood products was begun in 1982 in Louisiana to determine the phosphorus (P) nutritional requirements of the system. Fertilization of 60 kg ha−1 of P was required to produce 90% of the maximum volume at the age of 22 years. Direct-seeding pine in the interrows of a traditional pine plantation produced about 10.2 Mg ha−1 of biomass for energy at the age of 5 years but had no lasting effect on the planted pine height, diameter, or standing volume. The system is a viable method to produce both bioenergy and solidwood products. Herbaceous competition control and nitrogen (N) fertilization likely would make the system even more productive and profitable.

scholarly journals A Growth and Yield Model Incorporating Hardwood Competition for Natural Loblolly Pine Stands in the Georgia Piedmont

1999 ◽  
Vol 23 (3) ◽  
pp. 179-185 ◽  
Author(s):  
Stacey W. Martin ◽  
Graham H. Brister
Keyword(s):  
Loblolly Pine ◽  
Basal Area ◽  
Growth And Yield ◽  
Parameter Estimates ◽  
Yield Model ◽  
Pinus Taeda L ◽  
Projection Equations ◽  
Georgia Piedmont ◽  
The Impact ◽  
Over Time

Abstract Using 5 yr remeasurement data from even-aged natural loblolly pine (Pinus taeda L.) stands in the Georgia Piedmont, a system of growth equations was developed to project pine yield over time that accounts for hardwood competition. In this system, the increase in the proportion of hardwood basal area over time is estimated, then the projected pine basal area and trees per acre are adjusted inversely to account for this increase. The parameter estimates for this system ensure compatibility between volume prediction and projection equations and the proportion of hardwood basal area, pine basal area, dominant height, and trees per acre projection equations. The whole-stand growth and yield system developed here coupled with published merchantable yield equations allow for the evaluation of the impact of hardwoods on future stand yield and product distributions. The results indicate that the impact of hardwood competition on pine yield is substantial and occurs mainly as a reduction in sawtimber volume. South. J. Appl. For. 16(3):179-185.

scholarly journals Tree-Length System Evaluation of Second Thinning in a Loblolly Pine Plantation

2003 ◽  
Vol 27 (2) ◽  
pp. 77-82 ◽  
Author(s):  
Rien Visser ◽  
Karl Stampfer
Keyword(s):  
North Carolina ◽  
Loblolly Pine ◽  
System Evaluation ◽  
Field Observations ◽  
Pine Plantation ◽  
Piece Size ◽  
Tree Length ◽  
Study Methodology ◽  
Standing Timber ◽  
The Given

Abstract A productivity study and system evaluation was carried out on a tree-length operation working in a second thinning of loblolly pine near Greenville, North Carolina. The average tree volume was 8.1 ft3 and the average dbh was 8.4 in. The machines studied in the system were the Tigercat 720B feller-buncher, the Tigercat 630 skidder, and the tracked loader Tigercat 245. The goal was to reduce the standing timber from 225 trees/ac down to 92. Standard time-study methodology and multivariance statistical analyses were used to capture and evaluate the data. The key productivity parameters identified for the feller-buncher was piece volume and number of trees in the bunch, and for the skidder extraction distance, average piece volume and number of bunches picked up to make a turn. The ability of the loader to process increasing number of trees as average tree volume decreased, and the increased difficulty of delimbing the larger trees resulted in no significant variance for average piece size. Productivity functions were developed for the feller-buncher and the skidder. The system evaluation discusses the productivity balance between the machines for the given range of piece size as well as potential operational improvements based on in-field observations. South. J. Appl. For. 27(2):77–82.

Eleventh-Year Results of Fertilization, Herbaceous, and Woody Plant Control in a Loblolly Pine Plantation

1990 ◽  
Vol 14 (4) ◽  
pp. 173-177 ◽  
Author(s):  
James D. Haywood ◽  
Allan E. Tiarks
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Woody Plant ◽  
Sandy Loam ◽  
Herbaceous Plant ◽  
Pine Plantation ◽  
Stand Volume ◽  
Fine Sandy Loam ◽  
Pinus Taeda L ◽  
Plant Control

Abstract Through 11 years, fertilization at planting significantly increased the stemwood volume (outside bark) per loblolly pine (Pinus taeda L.) on an intensively prepared moderately well-drained fine sandy loam site in northern Louisiana. Four years of herbaceous plant control significantly increased pine survival, and because herbaceous plant control increased survival, it resulted in a significant increase in total stand volume. Woody plant control no longer produced significant results by age 11. South. J. Appl. For. 14(4):173-177.

scholarly journals A New Whole-Stand Model for Unmanaged Loblolly and Slash Pine Plantations in East Texas

2009 ◽  
Vol 33 (2) ◽  
pp. 69-76 ◽  
Author(s):  
Dean W. Coble
Keyword(s):  
Loblolly Pine ◽  
Basal Area ◽  
Pinus Elliottii ◽  
Current Data ◽  
Slash Pine ◽  
Pine Plantations ◽  
Growth And Yield ◽  
East Texas ◽  
Age Classes ◽  
Yield Model

Abstract A new compatible whole-stand growth-and-yield model to predict total tree cubic-foot volume per acre yield (outside and inside bark) was developed for unmanaged loblolly pine (Pinus taeda) and slash pine (Pinus elliottii) plantations in East Texas. This model was compared with the noncompatible whole-stand model of Lenhart (<xref ref-type="bibr" rid="B15-2127">Lenhart, 1996</xref>, Total and partial stand-level yield prediction for loblolly and slash pine plantations in east Texas, South. J. Appl. For. 20(1):36–41) and the <xref ref-type="bibr" rid="B15-2127">Lenhart (1996)</xref> model refit to current data. For the two species, all three models were evaluated with independent observed data. The model developed in this study outperformed both Lenhart models in prediction of future yield and basal area per acre for all age classes combined and by 5-year age classes. The Lenhart models consistently overestimated yield and basal area per acre. All three models predicted surviving trees per acre similarly. An example is also provided to show users how to use the new whole-stand model.

Switchgrass intercropping reduces soil inorganic nitrogen in a young loblolly pine plantation located in coastal North Carolina

2014 ◽  
Vol 319 ◽  
pp. 161-168 ◽  
Author(s):  
Kevan J. Minick ◽  
Brian D. Strahm ◽  
Thomas R. Fox ◽  
Eric B. Sucre ◽  
Zakiya H. Leggett ◽  
...  
Keyword(s):  
North Carolina ◽  
Loblolly Pine ◽  
Inorganic Nitrogen ◽  
Pine Plantation ◽  
Soil Inorganic Nitrogen ◽  
Soil Inorganic
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