Nitrogen Mineralization Following Vegetation Control and Fertilization in a 14-Year-Old Loblolly Pine Plantation

2004 ◽  
Vol 68 (1) ◽  
pp. 272-281 ◽  
Author(s):  
Nevzat Gurlevik ◽  
Daniel L. Kelting ◽  
H. Lee Allen
Keyword(s):  
Loblolly Pine ◽  
Nitrogen Mineralization ◽  
Pine Plantation ◽  
Vegetation Control

scholarly journals A Dynamic Stand Growth Model System for Loblolly Pine Responding to Mid-Rotation Treatments

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 556
Author(s):  
Mauricio Zapata-Cuartas ◽  
Bronson P. Bullock ◽  
Cristian R. Montes ◽  
Michael B. Kane
Keyword(s):  
Growth Model ◽  
Loblolly Pine ◽  
Basal Area ◽  
Model System ◽  
Growth And Yield ◽  
Site Quality ◽  
Response To Treatment ◽  
Plantation Management ◽  
Vegetation Control ◽  
Dominant Height

Intensive loblolly pine (Pinus taeda L.) plantation management in the southeastern United States includes mid-rotation silvicultural practices (MRSP) like thinning, fertilization, competitive vegetation control, and their combinations. Consistent and well-designed long-term studies considering interactions of MRSP are required to produce accurate projections and evaluate management decisions. Here we use longitudinal data from the regional Mid-Rotation Treatment study established by the Plantation Management Research Cooperative (PMRC) at the University of Georgia across the southeast U.S. to fit and validate a new dynamic model system rooted in theoretical and biological principles. A Weibull pdf was used as a modifier function coupled with the basal area growth model. The growth model system and error projection functions were estimated simultaneously. The new formulation results in a compatible and consistent growth and yield system and provides temporal responses to treatment. The results indicated that the model projections reproduce the observed behavior of stand characteristics. The model has high predictive accuracy (the cross-validation variance explained was 96.2%, 99.7%, and 98.6%; and the prediction root mean square distance was 0.704 m, 19.1 trees ha−1, and 1.03 m2ha−1 for dominant height (DH), trees per hectare (N), and basal area (BA), respectively), and can be used to project the current stand attributes following combinations of MRSP and with different thinning intensities. Simulations across southern physiographic regions allow us to conclude that the most overall ranking of MRSP after thinning is fertilization + competitive vegetation control (Fert + CVC) > fertilization only (Fert) > competitive vegetation control only (CVC), and Fert + CVC show less than additive effect. Because of the model structure, the response to treatment changes with location, age of application, and dominant height growth as indicators of site quality. Therefore, the proposed model adequately represents regional growth conditions.

scholarly journals Loblolly Pine—Pushing the Limits of Growth

2001 ◽  
Vol 25 (2) ◽  
pp. 69-74 ◽  
Author(s):  
Bruce E. Borders ◽  
Robert L. Bailey
Keyword(s):  
Loblolly Pine ◽  
Annual Increment ◽  
Complete Control ◽  
Vegetation Control ◽  
Mechanical Site Preparation ◽  
Yield Production ◽  
The World ◽  
Intensively Managed ◽  
Pinus Taeda L ◽  
Production Areas

Abstract With mean annual increments up to 5.4 cords/ac/yr, six loblolly pine (Pinus taeda L.) research sites in Georgia produced yields on par with other results from intensively managed loblolly plantations around the world. Cultural treatments in the Georgia study include complete control of vegetation other than the planted pines with multiple applications of herbicide, annual fertilization, the combination of complete vegetation control and annual fertilization, and an intensive mechanical site preparation treatment. Complete vegetation control resulted in higher yield production at ages 10 to 12 yr than the intensive mechanical treatment at all locations. This regime also resulted in higher yield production than the annual fertilization treatment at four of six locations. Volume mean annual increment for 10- to 12-yr-old plantations with the combination treatment of complete vegetation control and annual fertilization ranged from 325 to 490 ft3/ac, growth rates comparable to those obtained at other high biomass production areas throughout the world. Our economic evaluation based on these results shows that 8 to 12% real rates of return are feasible from investments in intensive loblolly pine plantations in the southeastern United States. South. J. Appl. For. 25(2):69–74.

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 Impacts of Vegetation Control, Genetic Improvement and their Interaction on Loblolly Pine Growth in the Southern United States—Age 12 Results

2002 ◽  
Vol 26 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Stacey W. Martin ◽  
Barry D. Shiver
Keyword(s):  
South Carolina ◽  
Loblolly Pine ◽  
Coastal Plain ◽  
Genetic Improvement ◽  
First Generation ◽  
Single Family ◽  
Genetic Stock ◽  
Vegetation Control ◽  
Mechanical Site Preparation ◽  
Competition Control

Abstract A designed study was established in the Coastal Plain of Georgia and northern Florida, and in the Piedmont of South Carolina, Georgia, and Alabama with the objectives of evaluating the impacts of first-generation genetic improvement and of combining genetic improvement and vegetation control on yields of loblolly pine. The two levels of competition control were either none, other than that provided by the operational mechanical site preparation, or complete competition control. Genetic treatments consisted of unimproved seed stock, bulk lot first-generation improved stock or single family first-generation improved stock. In terms of total volume, increases up to 45% (882 ft3/ac) and 39% (863 ft3/ac) were obtained from using complete vegetation control in the Coastal Plain and Piedmont regions, respectively. Improved genetic stock increased total volume an average of 11% (246 ft3/ac) to 16% (364 ft3/ac) in the Coastal Plain and 12% (277 ft3/ac) to 19% (445 ft3/ac) in the Piedmont for bulk lot and single families, respectively. For total volume, the effects of competition control and genetics were additive, indicating the managers should obtain the full benefit of these two treatments. In both regions, improved genetics significantly reduced the percent fusiform infection. In addition, no statistically significant differences were detected between bulk lot and single family plantings across all dependent variables. South. J. Appl. For. 26(1):37–42.

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