scholarly journals The University of West Florida Campus Ecosystem Study: Age-Diameter and Growth Relationships of Longleaf Pine Using Hurricane-Induced Windthrows

2021 ◽  
Author(s):  
Frank S. Gilliam ◽  
Heather N. Patten ◽  
Sarah K. Rabinowitz
Keyword(s):  
Cross Sections ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Wildlife Sanctuary ◽  
Natural Areas ◽  
Second Growth ◽  
Florida Panhandle ◽  
Longleaf Pines ◽  
Southern Georgia ◽  
The University

Abstract The campus of the University of West Florida was constructed among second-growth longleaf pine (Pinus palustris) stands that survived extensive logging in the Florida Panhandle. Previous studies on longleaf pine on the main UWF campus have estimated that 65% of these pines are 75 to 125 years old, with estimates based on a model from old-growth longleaf in southern Georgia. To obtain more accurate age data, one can use an increment corer to collect samples from live trees on site; more accurately, disks can be collected from recently fallen trees. On 16 September 2020, Hurricane Sally impacted UWF as a Category 2 storm, with winds reaching 125 kph. Our study took advantage of longleaf pines blowdowns by Sally to obtain cross-sections for age determinations. Two on-campus natural areas were chosen for sampling: the Edward Ball Nature Trail and the Baars-Firestone Wildlife Sanctuary. For each sampled section, diameter at breast height (DBH) and number of annual rings were recorded. Based on a total of 50 sampled trees, linear regression revealed a highly significant (P<0.00001; r2 =0.84) relationship between DBH and age. Applying this to DBH measures of 2,165 stems on the main campus indicates that the oldest longleaf pines are ~130 years old (mean age = 63.9±0.4 yr), consistent with cessation of historically wide-spread harvesting in the region. Mean age for the Trails site (55.7±1.6 yr) was significantly lower than that of the Sanctuary (66.7±2.0 yr), suggesting that they represented sites of contrasting land-use history. Direction of stem windthrows did not vary between natural areas and was consistent with characteristics of the eyewall of Hurricane Sally with strongest wind gusts moving from a southeast to northwest direction.

scholarly journals Twenty Years of Prescribed Burning Influence the Development of Direct-Seeded Longleaf Pine on a Wet Pine Site in Louisiana

2000 ◽  
Vol 24 (2) ◽  
pp. 86-92 ◽  
Author(s):  
James D. Haywood ◽  
Harold E. Grelen
Keyword(s):  
Loblolly Pine ◽  
Prescribed Burning ◽  
Longleaf Pine ◽  
Basal Area ◽  
Pinus Palustris ◽  
Fire Regimes ◽  
The Other ◽  
Direct Seeded ◽  
Longleaf Pines ◽  
Initial Research

Abstract Prescribed burning treatments were applied over a 20 yr period in a completely randomized field study to determine the effects of various fire regimes on vegetation in a direct seeded stand of longleaf pine (Pinus palustris Mill.). Seeding was done in November 1968. The study area was broadcast-burned about 16 months after seeding. The initial research treatments were applied in 1973, and as many as 12 research burns were applied through 1993. Pines were measured in March 1995. Prescribed burning resulted in a greater stocking of longleaf pine (an average of 598 trees/ac) on treated plots than on unburned plots (30 trees/ac). However, on the burned treatments, longleaf pines were significantly smaller (2.5 ft3/tree of stemwood) than were the unburned trees (3.7ft3/tree of stemwood). Half of the treated plots were burned in early March, and the other half were burned in early May. Seasons of burning did not significantly influence longleaf pine stocking. However, use of fire in May resulted in significantly greater basal area (100 ft2/ac) and stemwood production (1,921 ft3/ac) than burning in March (59 ft2/ac and 909 ft3/ac). Fire effectively kept natural loblolly pine (P. taeda L.) seedlings from reaching sapling size, but loblolly saplings and poles dominated the unburned plots (710 trees/ac). When all pines were considered on all treatments, stocking ranged from 467 to 740 trees/ac, but stocking was not significantly different among treatments. The unburned plots had significantly greater total basal area (149 ft2/ac) and stemwood productivity (2,918 ft3/ac) than the burned treatments (82 ft2/ac and 1,459 ft3 /ac). Likewise, hardwoods that were at least 1 in. dbh were more common on unburned p lots (327 stems/ac) than on burned treatments (58 stems/ac). South. J. Appl. For. 24(2):86-92.

Stem-profile Functions for Predicting Multiple-Product Volumes in Natural Longleaf Pines

1987 ◽  
Vol 11 (3) ◽  
pp. 161-167 ◽  
Author(s):  
Robert M. Farrar
Keyword(s):  
Computer Program ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Gulf Region ◽  
Multiple Product ◽  
Longleaf Pines

Abstract The stem-profile (taper) functions presented for natural longleaf pine (Pinus palustris Mill.) trees growing in the East Gulf region, when integrated, permit the prediction of volume between any two heights on a stem for three broad crown-ratio classes. Conversely, by iteration, thevolume between any two diameters on a stem can be predicted. The functions generally predict cubic-foot volumes that are within ± 0.5 ft³ of observed volume and account for at least 98% of the variation in observed volume. Comparisons are made with some existing D³H and volume-ratiovolume equations. Also, example applications of the functions are given along with an announcement (in the Appendix) of a computer program to evaluate the functions for cubic-foot volume. South. J. Appl. For. 11(3):161-167.

Thirty Years of Management on a Small Longleaf Pine Forest

1981 ◽  
Vol 5 (2) ◽  
pp. 73-77 ◽  
Author(s):  
William D. Boyer ◽  
Robert M. Farrar
Keyword(s):  
Longleaf Pine ◽  
Pinus Palustris ◽  
Pine Forest ◽  
Age Classes ◽  
High Quality ◽  
Second Growth ◽  
Balanced Distribution ◽  
Grass Stage

Abstract A management demonstration in an understocked 40-acre tract of second-growth longleaf pine (Pinus palustris Mill.) forest in south Alabama was begun in 1948. The management goal for this "farm forty" is to produce high-quality poles and logs on a 60-year rotation. Initial sawlog volume averaged 3,559 board feet per acre. Although periodic harvests removed 3,833 board feet per acre, standing volume after 30 years of management had increased to 5,408 board feet per acre. Over half the Forty has been harvested and naturally regenerated to longleaf, with the shelterwood system, and now supports stands ranging in size from grass-stage seedlings to small poles. Management costs have been minor. Continued management will lead to optimum stocking and a balanced distribution of age classes.

scholarly journals A Generational Change in Site Index for Naturally Established Longleaf Pine on a South Alabama Coastal Plain Site

2001 ◽  
Vol 25 (2) ◽  
pp. 88-92 ◽  
Author(s):  
William D. Boyer
Keyword(s):  
Coastal Plain ◽  
Climate Changes ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Site Index ◽  
Site Quality ◽  
Generational Change ◽  
Index Data ◽  
Second Growth

Abstract Research on longleaf pine (Pinus palustris Mill.) has been carried out for over 50 yr on a coastal plain site in south Alabama. Studies have included the original second-growth stands and also naturally established third-growth stands. Site index data revealed that estimated site index values for third growth generally exceeded those for second growth. Age 50 site index in 16 study compartments with second growth near index age averaged 66 ft. Estimated site index for third-growth stands recorded in 17 different compartments averaged 81 ft. Nine of the 16 compartments with second-growth stands now include third growth about 40 yr in age. This provided an opportunity to make a direct comparison of generational site index differences within the same compartments. Site index for second growth averaged 65 ft (range 61 to 70 ft), while third growth averaged 83 ft (range 77 to 87 ft). Reasons for this large increase in apparent site quality are unknown, but since soils are the same, some climate changes may be suspect. South. J. Appl. For. 25(2):88–92.

scholarly journals Site Index Curves for Direct-Seeded Loblolly and Longleaf Pines in Louisiana

1997 ◽  
Vol 21 (3) ◽  
pp. 134-138 ◽  
Author(s):  
Quang V. Cao ◽  
V. Clark Baldwin ◽  
Richard E. Lohrey
Keyword(s):  
Loblolly Pine ◽  
Longleaf Pine ◽  
Pinus Palustris ◽  
Site Index ◽  
Permanent Plots ◽  
Height Prediction ◽  
Direct Seeded ◽  
Stand Height ◽  
Pinus Taeda L ◽  
Longleaf Pines

Abstract Site index equations were developed for direct-seeded loblolly pine (Pinus taeda L.) and longleaf pine (Pinus palustris Mill.) based on data from 148 and 75 permanent plots, respectively. These plots varied from 0.053 to 0.119 ac in size, and were established in broadcast, row, and spot seeded stands throughout Louisiana. The Bailey and Clutter (1974) model was selected for stand height prediction. Site index curves are presented for both species based on these equations. These site index models should provide satisfactory short-term height projection for direct-seeded loblolly and longleaf pine stands in Louisiana. South. J. Appl. For. 21(3):134-138.

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