Growth and Yield of Shortleaf Pine In the West Gulf Region

Abstract A system of equations modeling the growth and development of uneven-aged shortleaf pine (Pinus echinata Mill.) stands is described. The prediction system consists of two main components: (1) a distance-independent, individual-tree simulator containing equations that forecast ingrowth, basal-area growth, probability of survival, total and merchantable heights, and total and merchantable volumes and weights of shortleaf pine trees; and (2) stand-level equations that predict hardwood ingrowth, basal-area growth, and mortality. These equations were combined into a computer simulation program that forecasts future states of uneven-aged shortleaf pine stands. Based on comparisons of observed and predicted stand conditions in shortleaf pine permanent forest inventory plots and examination of the growth patterns of hypothetical stands, the simulator makes acceptable forecasts of stand attributes. South. J. Appl. For. 24(2):112-120.

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Growth and Yield Following Four Reproduction Cutting Methods in Loblolly-Shortleaf Pine Stands--A Case Study

Southern Journal of Applied Forestry ◽

10.1093/sjaf/6.2.66 ◽

1982 ◽

Vol 6 (2) ◽

pp. 66-74 ◽

Cited By ~ 4

Author(s):

James B. Baker ◽

Paul A. Murphy

Keyword(s):

Pinus Taeda ◽

Growth And Yield ◽

Shortleaf Pine ◽

Advantages And Disadvantages ◽

Land Owners ◽

Second Growth ◽

Pine Regeneration ◽

Volume Production ◽

Pinus Taeda L

Abstract Four reproduction cutting methods employed on an average site (S.I. = 85 to 90 feet at 50 years) in second-growth loblolly-shortleaf pine (Pinus taeda L.--P. echinata Mill.) in south Arkansas provided adequate pine regeneration to establish or maintain well-stocked stands. During the 36-year study period, heavy seed-tree and diameter-limit cutting methods produced significantly more cubic-foot volume than selection and clearcutting, while clearcutting resulted in significantly less board-foot (Doyle) volume. Since many trees on the clearcut areas are just now reaching sawlog size, board-foot volume production among all treatments will probably equalize as time goes on. Advantages and disadvantages of the four cutting methods for large landholders and private nonindustrial land-owners are discussed.

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A Height–Diameter Curve for Longleaf Pine Plantations in the Gulf Coastal Plain

Southern Journal of Applied Forestry ◽

10.1093/sjaf/33.4.164 ◽

2009 ◽

Vol 33 (4) ◽

pp. 164-170 ◽

Cited By ~ 12

Author(s):

Daniel Leduc ◽

Jeffery Goelz

Keyword(s):

Longleaf Pine ◽

Pinus Palustris ◽

Tree Height ◽

Growth And Yield ◽

Average Height ◽

Yield Model ◽

Gulf Region ◽

Volume Calculation ◽

Sigmoidal Curve ◽

Quadratic Mean Diameter

Abstract Tree height is a critical component of a complete growth-and-yield model because it is one of the primary components used in volume calculation. To develop an equation to predict total height from dbh for longleaf pine (Pinus palustris Mill.) plantations in the West Gulf region, many different sigmoidal curve forms, weighting functions, and ways of expressing height and diameter were explored. Most of the functional forms tried produced very similar results, but ultimately the form developed by Levakovic was chosen as best. Another useful result was that scaling diameters by the quadratic mean diameter on a plot and height by the average height of dominant and codominant trees in the target stand resulted in dramatically better fits than using these variables in their raw forms.

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Optimum Management Regimes for Uneven-Aged Loblolly-Shortleaf Pine Stands Managed Under the Selection System in the West Gulf Region

Southern Journal of Applied Forestry ◽

10.1093/sjaf/13.3.117 ◽

1989 ◽

Vol 13 (3) ◽

pp. 117-122 ◽

Cited By ~ 5

Author(s):

James E. Hotvedt ◽

Yvonne F. Abernethy ◽

Robert M. Farrar

Keyword(s):

Basal Area ◽

Primary Objective ◽

Selection System ◽

Shortleaf Pine ◽

Annual Increment ◽

Gulf Region ◽

Decision Variables ◽

Management Regimes ◽

Pine Stands ◽

Optimum Management

Abstract Residual basal area, the ratio of sawtimber to total merchantable basal area, and cutting cycle length were used as decision variables to develop and analyze alternative management regimes for uneven-aged loblolly-shortleaf pine stands managed under the selection system in southernArkansas and northern Louisiana. Sawtimber and pulpwood yields associated with the regimes were calculated from models for all-aged loblolly-shortleaf pine stands with site indices of 85-95 ft (base age 50 yr) developed by Murphy and Farrar (1982, 1983). Optimum economic regimes based on presentnet value (PNV) had low sawtimber to merchantable basal area ratios (0.55) and short cutting cycles (4-5 yr) when compared to the ranges specified for these variables. Optimum sawtimber production regimes based on periodic annual increment (PAI) had high residual basal areas (60-65 ft²/ac),high sawtimber to merchantable basal area ratios (0.70-0.80), and short cutting cycles (4-6 yr). Using sawtimber production as the primary objective in choosing management regimes resulted in a large loss of PNV. The loss of annual sawtimber production was relatively low, however, when PNVwas used as the objective. South. J. Appl. For. 13(3):117-122.

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Compatible Tree-volume and Upper-Stem Diameter Equations for Plantation Loblolly Pines in the West Gulf Region

Southern Journal of Applied Forestry ◽

10.1093/sjaf/15.2.92 ◽

1991 ◽

Vol 15 (2) ◽

pp. 92-97 ◽

Cited By ~ 6

Author(s):

V. C. Baldwin ◽

D. P. Feduccia

Keyword(s):

Loblolly Pine ◽

Stem Diameter ◽

Simultaneous Estimation ◽

Parameter Estimates ◽

Model Formulation ◽

Gulf Region ◽

The West ◽

Loblolly Pines ◽

Gulf States ◽

Pinus Taeda L

Abstract Equations are presented for predicting inside bark (ib) or outside bark (ob) cubic-foot volume to any ob diameter limit, or the ib or ob diameter at any given height, of loblolly pine tress (Pinus taeda L.) growing in thinned or unthinned plantations in the West Gulf States region. The model formulation and simultaneous estimation technique utilized ensure that the volume and stem profile equations are compatible and the parameter estimates are statistically efficient. The 230 sample trees used to develop the equations were from central Louisiana plantations and ranged in diameters at breast height (D) from 1.3 to 20.8 in. in total height (H) from 16 to 96 ft, and in ages from 9 to 55 yr. Significant differences in stem profile between trees of the same D and H in unthinned and thinned plantations suggest that separate cubic-foot volume and upper-stem diameter prediction equations should be used South J. Appl. For. 15(2):92-97

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