VB merch-lob: A growth-and-yield prediction system with a merchandising optimizer for planted loblolly pine in the west Gulf region

Abstract Regional and national timber supply models require standing inventory update procedures. To date, most inventory update procedures used in regional timber supply algorithms have not made use of growth and yield methodology. We present growth and yield models to update standing inventories for natural and planted slash and loblolly pine stands in Georgia. These models were fitted to USDA Forest Service Forest Inventory and Analysis data obtained from the sixth survey of Georgia and should prove useful in regional timber supply projection algorithms. South. J. Appl. For. 23(4):230-237.

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A New Diameter Distribution Model for Unmanaged Loblolly Pine Plantations in East Texas

Southern Journal of Applied Forestry ◽

10.1093/sjaf/30.1.13 ◽

2006 ◽

Vol 30 (1) ◽

pp. 13-20 ◽

Cited By ~ 3

Author(s):

Young-Jin Lee ◽

Dean W. Coble

Keyword(s):

Loblolly Pine ◽

Pine Plantations ◽

Growth And Yield ◽

Distribution Model ◽

Diameter Distribution ◽

Yield Prediction ◽

East Texas ◽

Distribution Models ◽

Parameter Recovery ◽

Diameter Classes

Abstract A parameter recovery procedure for the Weibull distribution function based on four percentile equations was used to develop a diameter distribution yield prediction model for unmanaged loblolly pine (Pinus taeda L.) plantations in East Texas. This model was compared with the diameter distribution models of Lenhart and Knowe, which have been used in East Texas. All three models were evaluated with independent observed data. The model developed in this study performed better than the other two models in prediction of trees per acre and cubic-foot volume per acre (wood and bark, excluding stump) across diameter classes. Lenhart’s model consistently underestimated the larger-diameter classes because it was developed originally with data mostly collected in young plantations. Knowe’s model overestimated volume in sawtimber-sized trees, which could lead to overestimations of volume in older loblolly pine plantations found in East Texas. An example also is provided to show users how to use this new yield prediction system. These results support the recommendation that forest managers should use growth and yield models designed and/or calibrated for the region in which they are implemented.South. J. Appl.For. 30(1):13–20.

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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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Long-term trends in loblolly pine productivity and stand characteristics in response to thinning and fertilization in the West Gulf region

Forest Ecology and Management ◽

10.1016/j.foreco.2004.01.006 ◽

2004 ◽

Vol 192 (1) ◽

pp. 71-96 ◽

Cited By ~ 35

Author(s):

M.A. Sword Sayer ◽

J.C.G. Goelz ◽

J.L. Chambers ◽

Z. Tang ◽

T.J. Dean ◽

...

Keyword(s):

Loblolly Pine ◽

Gulf Region ◽

The West ◽

Long Term Trends ◽

Stand Characteristics

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Green and Dry-Weight Equations for Above-ground Components of Planted Loblolly Pine Trees in the West Gulf Region

Southern Journal of Applied Forestry ◽

10.1093/sjaf/11.4.212 ◽

1987 ◽

Vol 11 (4) ◽

pp. 212-218 ◽

Cited By ~ 20

Author(s):

V. C. Baldwin

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

Weight Ratio ◽

Dry Weight ◽

Prediction Equations ◽

Gulf Region ◽

The West ◽

Biomass Equations ◽

Pine Trees ◽

Pinus Taeda L

Abstract Prediction equations based on 130 sample trees from thinned and unthinned loblolly pine (Pinus taeda L.) plantations in central Louisiana are presented for the green and dry weights of aboveground tree components. Sample trees ranged from 2 to 21 in. dbh, 18 to 94 ft in height and from 9 to 55 yr in age. Significant differences in partial stem weight between trees from thinned and unthinned stands required development of separate sets of weight ratio equations. The range of the studies' observations increases the predictive applicability of planted loblolly pine biomass equations. South. J. Appl. For. 11(4):212-218.

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Comparison of Log Quality from Even-Aged and Uneven-Aged Loblolly Pine Stands in South Arkansas

Southern Journal of Applied Forestry ◽

10.1093/sjaf/15.1.10 ◽

1991 ◽

Vol 15 (1) ◽

pp. 10-17 ◽

Cited By ~ 9

Author(s):

James M. Guldin ◽

Michael W. Fitzpatrick

Keyword(s):

Pinus Taeda ◽

Loblolly Pine ◽

High Grade ◽

Average Difference ◽

Gulf Region ◽

The West ◽

Stand Management ◽

Pine Stands ◽

Pinus Taeda L ◽

Natural Stands

Abstract Log grade, number of knots, and log volume of the first two logs, as well as form class of the butt log, were compared across three broad sawtimber categories among even-aged plantations, even-aged natural stands, and uneven-aged natural stands of loblolly pine (Pinus taeda L.) in Ashley County, AR. Trees from uneven-aged stands had butt logs of better log grade than even-aged plantations, particularly in the large sawtimber component where the average difference was half a log grade. Compared to even-aged natural stands, trees from uneven-aged stands had logs of comparable grade. Trees from even-aged natural stands produced butt logs of slightly better grade, but with greater taper and less volume per log, than trees from even-aged plantations. To produce high-grade loblolly pine sawtimber in the West Gulf region, natural stand management will suffice; plantation management may require supplemental quality intervention such as artificial pruning. South. J. Appl. For. 15(1):10-17.

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